Opinions from J. A. Dunlop et al. 2013
- 'Ablator belongs to Corinnidae'
- 'Abliguritor is a subjective synonym of Ablator'
- 'Abliguritor niger is a subjective synonym of Ablator triguttatus'
- 'Abliguritor plumosus is recombined as Ablator plumosus'
- 'Acanthoscorpio belongs to Acanthoscorpionidae'
- 'Acanthoscorpio mucronatus belongs to Acanthoscorpio'
- 'Acanthoscorpionidae belongs to Acanthoscorpionoidea'
- 'Acanthoscorpionoidea belongs to Holosternina'
- 'Acaridiae is corrected as Acaridae and belongs to Acaroidea'
- 'Acariformes was reranked as a order and belongs to Acari'
- 'Acaroidea belongs to Astigmata'
- 'Acarus belongs to Acaridae'
- 'Acarus resinosus is a nomen dubium'
- 'Acarus rhombeus is recombined as Glaesacarus rhombeus'
- 'Achaearanea belongs to Theridiidae'
- 'Achaearanea extincta belongs to Achaearanea'
- 'Aclerogamasus belongs to Parasitidae'
- 'Aclerogamasus stenocornis belongs to Aclerogamasus'
- 'Acrokreischeria is a subjective synonym of Pleophrynus'
- 'Acrometa belongs to Synotaxidae'
- 'Acrometa cristata belongs to Acrometa'
- 'Acrometa pseudorobusta belongs to Acrometa'
- 'Actineda venustula is recombined as Anystis venustula'
- 'Aculeatarbus belongs to Palaeocharinidae'
- 'Acutiramus belongs to Pterygotidae'
- 'Adamator is a subjective synonym of Sosybius'
- 'Adamator succineus is recombined as Sosybius succineus'
- 'Adelophthalmidae belongs to Adelophthalmoidea'
- 'Adelophthalmoidea belongs to Diploperculata'
- 'Adelophthalmus belongs to Adelophthalmidae'
- 'Adelophthalmus asturica belongs to Adelophthalmus'
- 'Adelophthalmus asturica belongs to Adelophthalmus' according to Melendez 1971
- 'Adelophthalmus brasdorense belongs to Adelophthalmus'
- 'Adelophthalmus brasdorense belongs to Adelophthalmus' according to Bell 1922
- 'Adelophthalmus cambieri belongs to Adelophthalmus'
- 'Adelophthalmus cambieri belongs to Adelophthalmus' according to Pruvost 1930
- 'Adelophthalmus carbonarius belongs to Adelophthalmus'
- 'Adelophthalmus carbonarius belongs to Adelophthalmus' according to Chernyshev 1933
- 'Adelophthalmus chinensis belongs to Adelophthalmus' according to Grabau 1920
- 'Adelophthalmus chinensis belongs to Adelophthalmus'
- 'Adelophthalmus corneti belongs to Adelophthalmus' according to Pruvost 1939
- 'Adelophthalmus corneti belongs to Adelophthalmus'
- 'Adelophthalmus dumonti belongs to Adelophthalmus' according to Stainier 1917
- 'Adelophthalmus irinae belongs to Adelophthalmus' according to Shpinev 2006
- 'Adelophthalmus irinae belongs to Adelophthalmus'
- 'Adelophthalmus lohesti belongs to Adelophthalmus' according to Dewalque 1889
- 'Adelophthalmus lohesti belongs to Adelophthalmus'
- 'Adelophthalmus luceroensis belongs to Adelophthalmus'
- 'Adelophthalmus mazonensis belongs to Adelophthalmus' according to Hall 1877
- 'Adelophthalmus mazonensis belongs to Adelophthalmus'
- 'Adelophthalmus moyseyi belongs to Adelophthalmus' according to Woodward 1907
- 'Adelophthalmus moyseyi belongs to Adelophthalmus'
- 'Adelophthalmus pruvosti belongs to Adelophthalmus' according to Kjellesvig-Waering 1948
- 'Adelophthalmus wilsoni belongs to Adelophthalmus' according to Woodward 1888
- 'Adelphacaridae belongs to Ctenacaroidea'
- 'Adjunctor is a subjective synonym of Sosybius'
- 'Adjunctor similis is recombined as Sosybius similis'
- 'Adjutor belongs to Zodariidae'
- 'Adjutor mirabilis belongs to Adjutor'
- 'Adjutoridae is a subjective synonym of Zodariidae'
- 'Admissor belongs to Zodariidae'
- 'Admissor aculeatus belongs to Admissor'
- 'Adorator belongs to Zodariidae'
- 'Adorator brevipes is a subjective synonym of Adorator hispidus'
- 'Adorator samlandicus belongs to Adorator'
- 'Adulatrix is a subjective synonym of Sosybius'
- 'Adulatrix fusca is recombined as Sosybius fusca'
- 'Adulatrix parva is recombined as Sosybius parva'
- 'Adulatrix rufa is recombined as Sosybius rufa'
- 'Afrarchaea grimaldii is recombined as Burmesarchaea grimaldii'
- 'Agelena belongs to Agelenidae'
- 'Agelena tabida belongs to Agelena'
- 'Agelenidae belongs to Lycosoidea'
- 'Agyneta bigibber is recombined as Meioneta bigibber'
- 'Agyneta fastigata is recombined as Meioneta fastigata'
- 'Agyneta separata is recombined as Meioneta separata'
- 'Agynetiphantes belongs to Linyphiidae'
- 'Alicorhagiidae belongs to Alicorhagioidea'
- 'Alicorhagiina belongs to Endeostigmata'
- 'Alicorhagioidea belongs to Alicorhagiina'
- 'Alkenia belongs to Aphantomartidae'
- 'Allobuthiscorpiidae belongs to Eoctonoidea'
- 'Allobuthiscorpius is a subjective synonym of Compsoscorpius'
- 'Allobuthus belongs to Anthracoscorpionidae'
- 'Allobuthus macrostethus is a subjective synonym of Compsoscorpius buthiformis'
- 'Allopalaeophonidae belongs to Allopalaeophonoidea'
- 'Allopalaeophonoidea belongs to Holosternina'
- 'Allopalaeophonus belongs to Allopalaeophonidae'
- 'Alloscorpius is a subjective synonym of Eoscorpius'
- 'Allothrombium belongs to Trombidiidae'
- 'Almolinus belongs to Salticidae'
- 'Alopecosa belongs to Lycosidae'
- 'Alterphrurolithus belongs to Corinnidae'
- 'Alycidae belongs to Alycoidea'
- 'Alycina belongs to Endeostigmata'
- 'Alycoidea belongs to Alycina'
- 'Amarixys belongs to Curculioididae'
- 'Amaurobiidae belongs to Dictynoidea'
- 'Amaurobius faustus is a nomen dubium'
- 'Amaurobius rimosus is a nomen dubium'
- 'Amaurobius spinimanus is a nomen nudum'
- 'Amaurobius succini is recombined as Eomatachia succini'
- 'Amauropilio belongs to Sclerosomatidae'
- 'Ambiortiphagus belongs to Atypidae'
- 'Ambiortiphagus ponomarenkoi belongs to Ambiortiphagus'
- 'Amblyolpium belongs to Garypinidae'
- 'Ameticos belongs to Dyspnoi'
- 'Ametroproctidae is a subjective synonym of Cymbaeremaeidae'
- 'Ametroproctus belongs to Cymbaeremaeidae'
- 'Ammotrechidae belongs to Solifugae'
- 'Amphiclotho belongs to Araneae'
- 'Amphiclotho breviuscula belongs to Amphiclotho'
- 'Amphithomisus belongs to Araneae'
- 'Amphithomisus barbatus belongs to Amphithomisus'
- 'Anameta belongs to Tetragnathidae'
- 'Anandrus belongs to Synotaxidae'
- 'Anapidae belongs to Araneoidea'
- 'Anatone is a nomen nudum'
- 'Anatone marginata is a nomen nudum'
- 'Anatone spinipes is a nomen nudum'
- 'Anderella parva belongs to Anderella' according to Moore et al. 2007
- 'Androgeus is a subjective synonym of Hyptiotes'
- 'Androgeus militaris is recombined as Eomysmena militaris'
- 'Androgeus triqueter is recombined as Hyptiotes triqueter'
- 'Anelosimus belongs to Theridiidae'
- 'Anelosimus clypeatus belongs to Anelosimus'
- 'Anepeira belongs to Araneidae'
- 'Angusdarion belongs to Zodariidae'
- 'Anniculus belongs to Zodariidae'
- 'Anniculus balticus belongs to Anniculus'
- 'Anoplodactylidae is a subjective synonym of Phoxichilidiidae'
- 'Antennophorina belongs to Trigynaspida'
- 'Anthracochaerilidae is a subjective synonym of Centromachidae'
- 'Anthracochaerilus belongs to Centromachidae'
- 'Anthracochaerilus palustris belongs to Anthracochaerilus'
- 'Anthracomarti is replaced by Trigonotarbida'
- 'Anthracomartidae belongs to Trigonotarbida'
- 'Anthracomartus belongs to Anthracomartidae'
- 'Anthracomartus affinis is a subjective synonym of Planomartus krejcii'
- 'Anthracomartus denuiti is a subjective synonym of Anthracomartus priesti'
- 'Anthracomartus granulatus belongs to Anthracomartus'
- 'Anthracomartus hindi belongs to Anthracomartus'
- 'Anthracomartus krejcii is recombined as Planomartus krejcii'
- 'Anthracomartus minor belongs to Anthracomartus'
- 'Anthracomartus palatinus belongs to Anthracomartus'
- 'Anthracomartus priesti belongs to Anthracomartus'
- 'Anthracomartus pustulatus is recombined as Aphantomartus pustulatus'
- 'Anthracomartus socius is a subjective synonym of Anthracomartus minor'
- 'Anthracomartus triangularis belongs to Anthracomartus'
- 'Anthracomartus trilobitus belongs to Anthracomartus'
- 'Anthracomartus voelkelianus belongs to Anthracomartus'
- 'Trigonomartus woodruffi is a nomen dubium'
- 'Anthracophrynus belongs to Trigonotarbida'
- 'Anthracoscorpio belongs to Anthracoscorpionidae'
- 'Anthracoscorpio buthiformis is recombined as Compsoscorpius buthiformis'
- 'Anthracoscorpio dunlopi belongs to Anthracoscorpio'
- 'Anthracoscorpio juvenis belongs to Anthracoscorpio'
- 'Anthracoscorpionidae belongs to Eoctonoidea'
- 'Anthracosiro belongs to Anthracosironidae'
- 'Anthracosiro corsini is a subjective synonym of Anthracosiro woodwardi'
- 'Anthracosiro elongatus is a subjective synonym of Anthracosiro fritschii'
- 'Anthracosiro fritschii belongs to Anthracosiro'
- 'Anthracosiro latipes is a subjective synonym of Anthracosiro woodwardi'
- 'Anthracosiro woodwardi belongs to Anthracosiro'
- 'Anthracosironidae belongs to Trigonotarbida'
- 'Anthracotarbidae belongs to Phalangiotarbida'
- 'Anthracotarbus belongs to Anthracotarbidae'
- 'Antillostenochrus belongs to Hubbardiidae'
- 'Antopia is a subjective synonym of Eomysmena'
- 'Antopia tenera is recombined as Eomysmena tenera'
- 'Antrodiaetidae belongs to Mygalomorphae'
- 'Anyphaena belongs to Anyphaenidae'
- 'Anyphaena fuscata belongs to Anyphaena'
- 'Anyphaena interita is recombined as Palaeodrassus interitus'
- 'Anyphaenidae belongs to Dictynoidea'
- 'Anyphaenoides belongs to Anyphaenidae'
- 'Anystidae belongs to Anystoidea'
- 'Anystides belongs to Prostigmata'
- 'Anystina belongs to Anystides'
- 'Anystis belongs to Anystidae'
- 'Anystoidea belongs to Anystina'
- 'Anzinia belongs to Kreischeriidae'
- 'Aphantomartidae belongs to Trigonotarbida'
- 'Aphantomartus belongs to Aphantomartidae'
- 'Aphantomartus areolatus belongs to Aphantomartus'
- 'Aphantomartus pococki is a subjective synonym of Aphantomartus areolatus'
- 'Apostenus belongs to Liocranidae'
- 'Arachnolithulus belongs to Ochyroceratidae'
- 'Arachnolithulus pygmaeus belongs to Arachnolithulus'
- 'Arachnometa belongs to Archaeometidae'
- 'Aranea columbiae is recombined as Araneaovoius columbiae'
- 'Aranea exusta is recombined as Araneus exustus'
- 'Aranea globosa is recombined as Theridion globosus'
- 'Aranea oblonga is recombined as Theridion oblongum'
- 'Araneaovoius belongs to Araneae'
- 'Araneidae belongs to Araneoidea'
- 'Araneoclada belongs to Araneomorphae'
- 'Araneoidea belongs to Orbiculariae'
- 'Araneometa belongs to Araneidae'
- 'Araneomorphae belongs to Opisthothelae'
- 'Araneus belongs to Araneidae'
- 'Araneus kinchloeae belongs to Araneus' according to Dunlop and Jekel 2009
- 'Araneus kinchloeae belongs to Araneus'
- 'Araneus piraticus is recombined as Pirata piraticus'
- 'Araneus pullatus is recombined as Pardosa pullata'
- 'Araneus pulverulentus is recombined as Alopecosa pulverulenta'
- 'Araripescorpius belongs to Chactidae'
- 'Archaea belongs to Archaeidae'
- 'Archaea conica is recombined as Baltarchaea conica'
- 'Archaea copalensis is a subjective synonym of Eriauchenius gracilicollis'
- 'Archaea gracilicollis is recombined as Eriauchenius gracilicollis'
- 'Archaea gracilicollis belongs to Archaea' according to Millot 1948
- 'Archaea hyperoptica is recombined as Eoarchaea hyperoptica'
- 'Archaea incomta is a nomen nudum'
- 'Archaea laevigata is a subjective synonym of Archaea paradoxa'
- 'Archaea paradoxa belongs to Archaea'
- 'Archaea pougneti belongs to Archaea'
- 'Archaea sphinx is a nomen nudum'
- 'Archaeacarus belongs to Alicorhagiidae'
- 'Archaeacarus dubinini belongs to Archaeacarus'
- 'Archaeidae belongs to Palpimanoidea'
- 'Archaelagonops belongs to Lagonomegopidae'
- 'Archaemecys belongs to Mecysmaucheniidae'
- 'Archaemecys arcantiensis belongs to Archaemecys'
- 'Archaeobuthidae belongs to Buthoidea'
- 'Archaeoctonidae is a subjective synonym of Proscorpiidae'
- 'Archaeoctonoidea is an invalid subgroup of Scorpiones'
- 'Archaeoctonus belongs to Proscorpiidae'
- 'Archaeomartidae belongs to Trigonotarbida'
- 'Archaeomartus belongs to Archaeomartidae'
- 'Archaeomartus roessleri is recombined as Namurotarbus roessleri'
- 'Archaeometa belongs to Archaeometidae'
- 'Archaeometa nephilina belongs to Archaeometa'
- 'Archaeometidae belongs to Arachnida'
- 'Archaeophonus is a subjective synonym of Proscorpius'
- 'Archaeophonus eurypteroides is a subjective synonym of Proscorpius osborni'
- 'Archaeorchestidae belongs to Zetorchestoidea'
- 'Architarbida is a subjective synonym of Phalangiotarbida'
- 'Architarbidae belongs to Phalangiotarbida'
- 'Architarbus belongs to Architarbidae'
- 'Architarbus elongatum is recombined as Opiliotarbus elongatus'
- 'Architarbus hoffmanni belongs to Architarbus'
- 'Architarbus minor belongs to Architarbus'
- 'Architarbus rotundatus belongs to Architarbus'
- 'Architarbus silesiacus is recombined as Vratislavia silesiaca'
- 'Architarbus subovalis is recombined as Phalangiotarbus subovalis'
- 'Areomartus belongs to Trigonotarbida'
- 'Areomartus ovatus belongs to Areomartus'
- 'Argasidae belongs to Ixodoidea'
- 'Argenna belongs to Dictynidae'
- 'Argiope belongs to Araneidae'
- 'Argiopidae is a subjective synonym of Araneidae'
- 'Argyrarachne belongs to Araneomorphae'
- 'Argyrarachne solitus belongs to Argyrarachne'
- 'Argyrodes belongs to Theridiidae'
- 'Argyrodes crassipatellaris is recombined as Faiditus crassipatellaris'
- 'Argyrodes parvipatellaris belongs to Argyrodes'
- 'Argyroneta belongs to Cybaeidae'
- 'Argyroneta longipes belongs to Argyroneta'
- 'Argyronetidae is a subjective synonym of Cybaeidae'
- 'Ariadna belongs to Segestriidae'
- 'Ariadna paucispinosa belongs to Ariadna'
- 'Ariadna resinae belongs to Ariadna'
- 'Arianrhoda belongs to Anthracosironidae'
- 'Arrenurae is corrected as Arrenuroidea and belongs to Hydracarnidiae'
- 'Arthrodictyna belongs to Dictynidae'
- 'Arthrodictyna segmentata belongs to Arthrodictyna'
- 'Arthrodictynidae is a subjective synonym of Dictynidae'
- 'Arthrolycosa belongs to Arthrolycosidae'
- 'Arthrolycosa antiqua belongs to Arthrolycosa'
- 'Arthrolycosa beecheri is a subjective synonym of Arthromygale fortis'
- 'Arthrolycosa carcinoides is recombined as Anthracomartus carcinoides'
- 'Arthrolycosa danielsi belongs to Arthrolycosa'
- 'Arthrolycosa fortis is recombined as Arthromygale fortis'
- 'Arthrolycosa prolifera is a nomen vanum'
- 'Arthrolycosa salticoides is a subjective synonym of Anthracomartus carcinoides'
- 'Arthrolycosidae belongs to Mesothelae'
- 'Arthromygale belongs to Arthromygalidae'
- 'Arthromygalidae belongs to Mesothelae'
- 'Aspiscorpio belongs to Allobuthiscorpiidae'
- 'Aspiscorpio eagari belongs to Aspiscorpio'
- 'Astigmata belongs to Oribatida'
- 'Astodipoena is a subjective synonym of Eomysmena'
- 'Atanaupodus belongs to Tanaupodidae'
- 'Atanaupodus bakeri belongs to Atanaupodus'
- 'Atemnidae belongs to Cheliferoidea'
- 'Athera is a nomen nudum'
- 'Athera exilis is a nomen nudum'
- 'Atocatle belongs to Araneae'
- 'Atocatle ranulfoi belongs to Atocatle'
- 'Attercopus belongs to Uraraneida'
- 'Attidae is a subjective synonym of Salticidae'
- 'Attoides belongs to Salticidae'
- 'Attoides eresiformis belongs to Attoides'
- 'Attopsis hirsutus is recombined as Eoattopsis hirsutus'
- 'Atypidae belongs to Mygalomorphae'
- 'Atypoidea belongs to Mygalomorphae'
- 'Auximus fossilis is a nomen dubium'
- 'Auximus succini is a nomen dubium'
- 'Aviculariidae is a subjective synonym of Theraphosidae'
- 'Aysha bulla is recombined as Anyphaenoides bulla'
- 'Azilia belongs to Tetragnathidae'
- 'Balaustium belongs to Erythraeidae'
- 'Baltarchaea belongs to Archaeidae'
- 'Balticatypus belongs to Atypidae'
- 'Balticgnatha belongs to Tetragnathidae'
- 'Balticoblemma belongs to Tetrablemmidae'
- 'Balticocryphoeca belongs to Dictynidae'
- 'Balticolipus belongs to Cyatholipidae'
- 'Balticonesticus belongs to Nesticidae'
- 'Balticonopsis belongs to Anapidae'
- 'Balticoridion belongs to Theridiidae'
- 'Balticoroma belongs to Comaromidae'
- 'Balticpholcomma belongs to Theridiidae'
- 'Baltleucauge belongs to Tetragnathidae'
- 'Baltocteniza belongs to Ctenizidae'
- 'Baltocteniza kulickae belongs to Baltocteniza'
- 'Baltsuccinidae belongs to Araneoidea'
- 'Baltsuccinus belongs to Baltsuccinidae'
- 'Bararaneus belongs to Araneidae'
- 'Barychelidae belongs to Mygalomorphae'
- 'Bassipterus belongs to Adelophthalmidae'
- 'Bdella belongs to Bdellidae'
- 'Bdella lata is recombined as Bdellodes lata'
- 'Bdellidae belongs to Bdelloidea'
- 'Bdellodes belongs to Bdellidae'
- 'Bdelloidea belongs to Eupodides'
- 'Beierowithius belongs to Withiidae'
- 'Belbites belongs to Damaeidae'
- 'Belinurus is corrected as Bellinurus and belongs to Bellinuridae'
- 'Belinurus bellulus is recombined as Bellinurus bellulus'
- 'Belinurus koenigianus is recombined as Bellinurus koenigianus'
- 'Belinurus morgani is recombined as Bellinurus morgani'
- 'Belinurus truemani is recombined as Bellinurus truemani'
- 'Bellinuridae belongs to Bellinurina'
- 'Bellinurina belongs to Xiphosurida'
- 'Bellinurus baldwini belongs to Bellinurus'
- 'Bellinurus danae is recombined as Euproops danae'
- 'Bellinurus longicaudatus belongs to Bellinurus'
- 'Bellinurus regina is recombined as Bellinurus reginae'
- 'Bembicosoma belongs to Planaterga'
- 'Bembicosoma pomphicus belongs to Bembicosoma'
- 'Benniescorpio belongs to Scoloposcorpionidae'
- 'Benoibates belongs to Oripodidae'
- 'Bilobosternina was reranked as a suborder and belongs to Scorpiones'
- 'Bolostromus belongs to Cyrtaucheniidae'
- 'Bolostromus destructus belongs to Bolostromus'
- 'Borboropactidae is a subjective synonym of Thomisidae'
- 'Borchgrevinkium taimyrensis belongs to Borchgrevinkium' according to Novojilov 1959
- 'Boreoscorpio belongs to Isobuthidae'
- 'Boreoscorpio copelandi belongs to Boreoscorpio'
- 'Bornatarbus belongs to Architarbidae'
- 'Brachylycosa is a subjective synonym of Anthracomartus'
- 'Brachylycosa kustae is recombined as Anthracomartus kustae'
- 'Brachypyge belongs to Anthracomartidae'
- 'Brachypyge carbonis belongs to Brachypyge'
- 'Brachypyge celtica is recombined as Maiocercus celticus'
- 'Brachypygidae is a subjective synonym of Anthracomartidae'
- 'Brachypylina belongs to Oribatida'
- 'Branchioscorpio belongs to Branchioscorpionidae'
- 'Branchioscorpio richardsoni belongs to Branchioscorpio'
- 'Branchioscorpionidae belongs to Branchioscorpionoidea'
- 'Branchioscorpionina is an invalid subgroup of Scorpiones'
- 'Branchioscorpionoidea belongs to Bilobosternina'
- 'Brigantibunum belongs to Eupnoi'
- 'Brommellina belongs to Dictynidae'
- 'Bromsgroviscorpio belongs to Isobuthidae'
- 'Bromsgroviscorpio willsi belongs to Bromsgroviscorpio'
- 'Brontoscorpio belongs to Scorpiones'
- 'Brontoscorpio anglicus belongs to Brontoscorpio'
- 'Buffalopterus belongs to Dolichopteridae'
- 'Bunodes lunula belongs to Bunodes' according to Eichwald 1854
- 'Bunodes rugosus belongs to Bunodes' according to Eichwald 1854
- 'Burlagonomegops belongs to Lagonomegopidae'
- 'Burlagonomegops alavensis belongs to Burlagonomegops'
- 'Burlagonomegops eskovi belongs to Burlagonomegops'
- 'Burmadictyna belongs to Dictynidae'
- 'Burmascutidae belongs to Entelegynae'
- 'Burmascutum belongs to Burmascutidae'
- 'Burmesarchaea belongs to Archaeidae'
- 'Burmesiola belongs to Hersiliidae'
- 'Burmorchestina belongs to Oonopidae'
- 'Burmuloborus belongs to Uloboridae'
- 'Buthidae belongs to Buthoidea'
- 'Buthiscorpiidae belongs to Eoctonoidea'
- 'Buthiscorpius belongs to Buthiscorpiidae'
- 'Buthiscorpius lemayi belongs to Buthiscorpius'
- 'Buthiscorpius major is a subjective synonym of Compsoscorpius buthiformis'
- 'Buthiscorpius pescei belongs to Buthiscorpius' according to Vachon and Heyler 1985
- 'Buthiscorpius pescei is recombined as Allobuthus pescei'
- 'Buthoidea belongs to Orthosternina'
- 'Caddidae belongs to Caddoidea'
- 'Caddo belongs to Caddidae'
- 'Caddoidea belongs to Eupnoi'
- 'Caduceator belongs to Sparassidae'
- 'Caduceator minutus belongs to Caduceator'
- 'Caduceator quadrimaculatus belongs to Caduceator'
- 'Calcitro belongs to Calcitronidae'
- 'Calcitronidae belongs to Schizomida'
- 'Calcoschizomus belongs to Hubbardiidae'
- 'Calilinus belongs to Salticidae'
- 'Camanchia grovensis belongs to Camanchia' according to Moore et al. 2011
- 'Cambropycnogon klausmuelleri belongs to Cambropycnogon' according to Waloszek and Dunlop 2002
- 'Camisia belongs to Camisiidae'
- 'Camisiidae belongs to Crotonioidea'
- 'Campylocephalus belongs to Hibbertopteridae'
- 'Canadaorchestina belongs to Oonopidae'
- 'Caponiidae belongs to Haplogynae'
- 'Captrix belongs to Gnaphosidae'
- 'Carabodidae belongs to Carabodoidea'
- 'Carabodites belongs to Carabodidae'
- 'Carabodoidea belongs to Brachypylina'
- 'Carcinosoma belongs to Carcinosomatidae'
- 'Carcinosomatidae belongs to Carcinosomatoidea'
- 'Carcinosomatoidea belongs to Diploperculata'
- 'Carios belongs to Argasidae'
- 'Castianeira belongs to Corinnidae'
- 'Castianeira tenebricosa belongs to Castianeira'
- 'Caudasinus belongs to Theridiidae'
- 'Cenattus belongs to Salticidae'
- 'Cenattus exophthalmicus belongs to Cenattus'
- 'Cenotextricella belongs to Micropholcommatidae'
- 'Cenotextricella simoni belongs to Cenotextricella'
- 'Centromachidae belongs to Mesophonoidea'
- 'Centromachus belongs to Centromachidae'
- 'Centruroides belongs to Buthidae'
- 'Centruroides beynai is a subjective synonym of Centruroides nitidus'
- 'Centrurus is replaced by Centruroides'
- 'Centrurus nitidus belongs to Centrurus' according to Thorell 1876
- 'Centrurus nitidus is recombined as Centruroides nitidus'
- 'Cepheidae belongs to Cepheoidea'
- 'Cepheoidea belongs to Brachypylina'
- 'Cepheus belongs to Cepheidae'
- 'Cepheus tegeocraniformis is recombined as Xenillus tegeocraniformis'
- 'Ceratinopsis belongs to Linyphiidae'
- 'Ceratoppia belongs to Peloppiidae'
- 'Ceratozetidae belongs to Ceratozetoidea'
- 'Ceratozetoidea belongs to Brachypylina'
- 'Cercidiella belongs to Araneae'
- 'Cercidiella aquisextana belongs to Cercidiella'
- 'Ceromidae belongs to Solifugae'
- 'Chactas belongs to Chactidae'
- 'Chactidae belongs to Chactoidea'
- 'Chactoidea belongs to Orthosternina'
- 'Chaerilidae belongs to Chactoidea'
- 'Cheiridiidae belongs to Cheiridioidea'
- 'Cheiridioidea belongs to Panctenata'
- 'Cheiridium belongs to Cheiridiidae'
- 'Cheiromachus is a nomen dubium'
- 'Cheiromachus coriaceus is a nomen dubium'
- 'Chelicerinus belongs to Synotaxidae'
- 'Chelicirrum belongs to Dictynidae'
- 'Chelifer belongs to Withiidae'
- 'Chelifer ehrenbergii is a nomen dubium'
- 'Chelifer hartmanni is recombined as Cheiridium hartmanni'
- 'Chelifer hemprichii is recombined as Pseudogarypus hemprichii'
- 'Chelifer kleemanni is recombined as Pycnochelifer kleemanni'
- 'Chelifer wigandi is recombined as Oligochernes wigandi'
- 'Cheliferidae belongs to Cheliferoidea'
- 'Cheliferoidea belongs to Panctenata'
- 'Chelignathus belongs to Tridenchthoniidae'
- 'Chelignathus kochii belongs to Chelignathus'
- 'Chelonethi was reranked as a unranked clade and belongs to Pseudoscorpiones'
- 'Chemmisomma belongs to Corinnidae'
- 'Chemmisomma dubia belongs to Chemmisomma'
- 'Chernetidae belongs to Cheliferoidea'
- 'Cheyletidae belongs to Cheyletoidea'
- 'Cheyletoidea belongs to Raphignathina'
- 'Cheyletus belongs to Cheyletidae'
- 'Cheyletus burmiticus belongs to Cheyletus'
- 'Cheyletus portentosus belongs to Cheyletus'
- 'Chiapasona belongs to Clubionidae'
- 'Chiapasona defuncta belongs to Chiapasona'
- 'Chrosiothes belongs to Theridiidae'
- 'Chrosiothes biconigerus belongs to Chrosiothes'
- 'Chrosiothes curvispinosus belongs to Chrosiothes'
- 'Chrosiothes emulgatus belongs to Chrosiothes'
- 'Chrosiothes longispinosus belongs to Chrosiothes'
- 'Chrosiothes monoceros belongs to Chrosiothes'
- 'Chrosiothes tumulus belongs to Chrosiothes'
- 'Chrosiothes unicornis belongs to Chrosiothes'
- 'Chrysometata belongs to Araneidae'
- 'Chrysso belongs to Theridiidae'
- 'Chrysso conspicua belongs to Chrysso'
- 'Chrysso dubia belongs to Chrysso'
- 'Chthoniidae belongs to Chthonioidea'
- 'Chthonioidea belongs to Epiochierata'
- 'Chthonius belongs to Chthoniidae'
- 'Chthonius (Chthonius) belongs to Chthonius'
- 'Chthonius (Chthonius) pristinus belongs to Chthonius (Chthonius)'
- 'Cladonychidae belongs to Travunioidea'
- 'Clavibertus belongs to Theridiidae'
- 'Cleptomartus is a subjective synonym of Anthracomartus'
- 'Cleptomartus planus is a subjective synonym of Anthracomartus hindi'
- 'Cleptomartus plautus is a subjective synonym of Anthracomartus priesti'
- 'Cleptomartus ploetzensis is a subjective synonym of Aphantomartus pustulatus'
- 'Clostes belongs to Dipluridae'
- 'Clostes priscus belongs to Clostes'
- 'Clubiona belongs to Clubionidae'
- 'Clubiona arcana belongs to Clubiona'
- 'Clubiona attenuata belongs to Clubiona'
- 'Clubiona curvispinosa belongs to Clubiona'
- 'Clubiona eseri is a nomen nudum'
- 'Clubiona eversa is recombined as Eoversatrix eversa'
- 'Clubiona florissanti belongs to Clubiona'
- 'Clubiona lanata belongs to Clubiona'
- 'Clubiona latebrosa is recombined as Eobumbatrix latebrosa'
- 'Clubiona latifrons is a nomen nudum'
- 'Clubiona microphthalma belongs to Clubiona'
- 'Clubiona ostentata is recombined as Eostentatrix ostentata'
- 'Clubiona pubescens belongs to Clubiona'
- 'Clubiona sericea belongs to Clubiona'
- 'Clubiona tomentosa belongs to Clubiona'
- 'Clubionella belongs to Araneae'
- 'Clubionella antiqua belongs to Clubionella'
- 'Clubionidae belongs to Clubionoidea'
- 'Clubionoidea belongs to Orbiculariae'
- 'Clubionoides nutua is recombined as Elaver nutua'
- 'Clya belongs to Theridiidae'
- 'Clya lugubris belongs to Clya'
- 'Clythia is a nomen dubium'
- 'Clythia alma is a nomen dubium'
- 'Clythia gracilenta is a nomen nudum'
- 'Clythia leptocarena is a nomen nudum'
- 'Cnephalocotes belongs to Linyphiidae'
- 'Collacteus belongs to Sparassidae'
- 'Collacteus captivus belongs to Collacteus'
- 'Collohmanniidae belongs to Collohmannioidea'
- 'Collohmannioidea belongs to Mixonomata'
- 'Comarominae was reranked as the family Comaromidae and belongs to Araneoidea'
- 'Compluriscutula belongs to Ixodidae'
- 'Compluriscutula vetulum belongs to Compluriscutula'
- 'Compsoscorpius belongs to Scorpionoidea'
- 'Compsoscorpius elegans is a subjective synonym of Compsoscorpius buthiformis'
- 'Compsoscorpius elongatus is a subjective synonym of Compsoscorpius buthiformis'
- 'Concursator belongs to Clubionoidea'
- 'Copaldictyna belongs to Titanoecidae'
- 'Coriarachne belongs to Thomisidae'
- 'Corinna belongs to Corinnidae'
- 'Corinna flagelliformis belongs to Corinna'
- 'Corinnidae belongs to Clubionoidea'
- 'Corneometa belongs to Tetragnathidae'
- 'Corniops belongs to Orthosternina'
- 'Corniops mapesii belongs to Corniops'
- 'Cornuanandrus belongs to Synotaxidae'
- 'Cornucymbium belongs to Corinnidae'
- 'Cornupalpatum belongs to Ixodidae'
- 'Cornupalpatum burmanicum belongs to Cornupalpatum'
- 'Cornutidion belongs to Theridiidae'
- 'Cornutidion elongatum belongs to Cornutidion'
- 'Corynitis is replaced by Corynitoides'
- 'Corynitoides spinosa is a nomen dubium'
- 'Corynitoides undulata is a nomen dubium'
- 'Corynitoides is a nomen dubium'
- 'Coryphomartidae is a subjective synonym of Anthracomartidae'
- 'Coryphomartus is a subjective synonym of Anthracomartus'
- 'Coryssocnemis belongs to Pholcidae'
- 'Corythalia belongs to Salticidae'
- 'Corythalia ocululiter belongs to Corythalia'
- 'Corythalia pilosa belongs to Corythalia'
- 'Corythalia scissa belongs to Corythalia'
- 'Coseleyscorpio is a subjective synonym of Compsoscorpius'
- 'Coseleyscorpio lanceolatus is a subjective synonym of Compsoscorpius buthiformis'
- 'Cosmochthoniidae belongs to Prothoplophoroidea'
- 'Craspedisia belongs to Theridiidae'
- 'Craspedisia yapchoontecki belongs to Craspedisia'
- 'Cratosolpuga belongs to Ceromidae'
- 'Cretacattyma belongs to Antrodiaetidae'
- 'Cretacattyma raveni belongs to Cretacattyma'
- 'Cretadiplura belongs to Dipluridae'
- 'Cretadiplura ceara belongs to Cretadiplura'
- 'Cretadromus belongs to Philodromidae'
- 'Cretamygale belongs to Nemesiidae'
- 'Cretaraneus belongs to Nephilidae'
- 'Cretaraneus liaoningensis belongs to Cretaraneus'
- 'Cretaraneus vilaltae belongs to Cretaraneus'
- 'Cretohexura belongs to Mecicobothriidae'
- 'Cretohexura coylei belongs to Cretohexura'
- 'Cretomegahexura belongs to Mecicobothriidae'
- 'Cretomegahexura platnicki belongs to Cretomegahexura'
- 'Crotonioidea belongs to Nothrina'
- 'Cryphoezaga belongs to Dictynidae'
- 'Cryptocheiridium belongs to Cheiridiidae'
- 'Cryptomartus is a subjective synonym of Anthracomartus'
- 'Cryptomartus meyeri is a subjective synonym of Anthracomartus hindi'
- 'Cryptomartus radvanicensis is recombined as Anthracomartus radvanicensis'
- 'Cryptoplanus belongs to Corinnidae'
- 'Cryptoscorpius belongs to Palaeopisthacanthidae'
- 'Cryptoscorpius americanus belongs to Cryptoscorpius'
- 'Ctenacaridae belongs to Ctenacaroidea'
- 'Ctenacaroidea belongs to Palaeosomata'
- 'Ctenidae belongs to Lycosoidea'
- 'Ctenizidae belongs to Mygalomorphae'
- 'Curculioides belongs to Curculioididae'
- 'Curculioides prestvicii is recombined as Eophrynus prestvicii'
- 'Curculioididae belongs to Palaeoricinulei'
- 'Custodela belongs to Linyphiidae'
- 'Custodelela belongs to Linyphiidae'
- 'Cyatholipidae belongs to Araneoidea'
- 'Cyathosuccinus belongs to Cyatholipidae'
- 'Cybaeidae belongs to Dictynoidea'
- 'Cyclophthalmidae belongs to Cyclophthalmoidea'
- 'Cyclophthalmoidea belongs to Meristosternina'
- 'Cyclophthalmus belongs to Cyclophthalmidae'
- 'Cyclophthalmus kralupensis is recombined as Isobuthus kralupensis'
- 'Cyclophthalmus robustus belongs to Cyclophthalmus'
- 'Cyclophthalmus senior belongs to Cyclophthalmus'
- 'Cyclophthalmus sibiricus belongs to Cyclophthalmus'
- 'Cyclosa verrucosa is recombined as Enacrosoma verrucosa'
- 'Cyclososoma belongs to Araneidae'
- 'Cyclotrogulus is a subjective synonym of Stenotrogulus'
- 'Cyclotrogulus sturii is a subjective synonym of Stenotrogulus salmii'
- 'Cymbaeremaeidae belongs to Cymbaeremaeoidea'
- 'Cymbaeremaeoidea belongs to Brachypylina'
- 'Cymbiohahnia belongs to Hahniidae'
- 'Cymbiopholcomma belongs to Theridiidae'
- 'Cyphophthalmi belongs to Opiliones'
- 'Cyrtaucheniidae belongs to Mygalomorphae'
- 'Cyrtognatha belongs to Tetragnathidae'
- 'Daesiidae belongs to Solifugae'
- 'Daesiidae belongs to Solifugae' according to Dunlop et al. 2004
- 'Damaeidae belongs to Damaeoidea'
- 'Damaeoidea belongs to Brachypylina'
- 'Damaeus mexicanus is recombined as Oppia mexicana'
- 'Damaeus setiger is recombined as Oppia setigera'
- 'Daohugopilio belongs to Eupnoi'
- 'Dasumiana belongs to Dysderidae'
- 'Deinopidae belongs to Deinopoidea'
- 'Deinopis belongs to Deinopidae'
- 'Deinopoidea belongs to Orbiculariae'
- 'Dermanyssiae belongs to Gamasina'
- 'Dermanyssoidea belongs to Dermanyssiae'
- 'Descangeles belongs to Salticidae'
- 'Descangeles pygmaeus belongs to Descangeles'
- 'Descanso belongs to Salticidae'
- 'Desidae belongs to Dictynoidea'
- 'Desmonomata belongs to Oribatida'
- 'Desultor belongs to Clubionidae'
- 'Desultor depressus belongs to Desultor'
- 'Devonacaridae belongs to Enarthronota'
- 'Devonotarbidae belongs to Phalangiotarbida'
- 'Devonotarbus belongs to Devonotarbidae'
- 'Dichela belongs to Cheliferidae'
- 'Dichela berendtii belongs to Dichela'
- 'Dicranopalpus belongs to Phalangiidae'
- 'Dicranopalpus palmickensis is a subjective synonym of Dicranopalpus ramiger'
- 'Dictyna belongs to Dictynidae'
- 'Dictynidae belongs to Dictynoidea'
- 'Dictynoidea belongs to Orbiculariae'
- 'Dielacata is a nomen nudum'
- 'Dielacata superba is a nomen nudum'
- 'Dinodiplura belongs to Dipluridae'
- 'Dinodiplura ambulacra belongs to Dinodiplura'
- 'Dinopilio belongs to Pyritaraneidae'
- 'Dinopilio gigas belongs to Dinopilio'
- 'Diploperculata belongs to Eurypterina'
- 'Dipluridae belongs to Mygalomorphae'
- 'Dipoena praedominicana is recombined as Dipoenata praedominicana'
- 'Dipoenata belongs to Theridiidae'
- 'Dipoenata altioculata belongs to Dipoenata'
- 'Dipoenata cala belongs to Dipoenata'
- 'Dipoenata clypeata belongs to Dipoenata'
- 'Dipoenata globulus belongs to Dipoenata'
- 'Dipoenata stipes belongs to Dipoenata'
- 'Dipoenata yolandae belongs to Dipoenata'
- 'Discotarbus belongs to Architarbidae'
- 'Discotarbus deplanatus belongs to Discotarbus'
- 'Distanilinus belongs to Salticidae'
- 'Dolichophonidae [misspelled as Dolichophoniidae] belongs to Branchioscorpionoidea'
- 'Dolichophonus belongs to Dolichophoniidae'
- 'Dolichopteridae belongs to Eurypteroidea'
- 'Dolichopterus belongs to Dolichopteridae'
- 'Dolichopterus jewetti belongs to Dolichopterus'
- 'Dolichopterus laticeps belongs to Dolichopterus' according to Schmidt 1883
- 'Dolichopterus laticeps is recombined as Strobilopterus laticeps'
- 'Dolichopterus stoermeri is a subjective synonym of Strobilopterus laticeps'
- 'Dolichopterus testudineus is recombined as Clarkeipterus testudineus'
- 'Dolomedes belongs to Pisauridae'
- 'Dominicanopsis belongs to Mysmenidae'
- 'Donuea belongs to Liocranidae'
- 'Dorfopterus belongs to Eurypterida'
- 'Dracochela belongs to Dracochelidae'
- 'Dracochelidae belongs to Pseudoscorpiones'
- 'Drassodes belongs to Gnaphosidae'
- 'Drassodes sextii belongs to Drassodes'
- 'Drassodidae is a subjective synonym of Gnaphosidae'
- 'Drassus cupreus belongs to Drassus' according to Blackwall 1834
- 'Drassus cupreus is recombined as Drassodes cupreus'
- 'Drassus oblongus is a nomen nudum'
- 'Drassyllinus belongs to Gnaphosidae'
- 'Drassyllinus aliter belongs to Drassyllinus'
- 'Drepanopteridae belongs to Hibbertopteroidea'
- 'Drepanopterus belongs to Drepanopteridae'
- 'Drepanopterus bembycoides is a subjective synonym of Stoermeropterus conicus'
- 'Drepanopterus lobatus is a subjective synonym of Stoermeropterus conicus'
- 'Drepanopterus pentlandicus belongs to Drepanopterus'
- 'Dryadia belongs to Lycosidae'
- 'Dubianapis belongs to Anapidae'
- 'Dubiosynotaxus belongs to Synotaxidae'
- 'Duma is a nomen oblitum'
- 'Dysdera belongs to Dysderidae'
- 'Dysdera glabrata is a nomen nudum'
- 'Dysdera hippopodium is a nomen nudum'
- 'Dysdera scobiculata is a nomen nudum'
- 'Dysdera tersa is recombined as Harpactea tersa'
- 'Dysderidae belongs to Dysderoidea'
- 'Dysderoidea belongs to Haplogynae'
- 'Dyspnoi belongs to Opiliones'
- 'Ecchosis belongs to Pantetrapulmonata'
- 'Ecchosis pulchribothrium belongs to Ecchosis'
- 'Echinopustulus belongs to Dyspnoi'
- 'Ecotona belongs to Thomisidae'
- 'Ecotona transipeda belongs to Ecotona'
- 'Ectona brunnea is recombined as Ecotona brunnea'
- 'Ectona pilulifera is recombined as Ecotona pilulifera'
- 'Eidmanella belongs to Nesticidae'
- 'Elaver belongs to Clubionidae'
- 'Elaverimartus is a nomen dubium'
- 'Elaverimartus pococki is a nomen dubium'
- 'Electrobisium belongs to Neobisiidae'
- 'Electrobisium acutum belongs to Electrobisium'
- 'Electrochaerilus belongs to Chaerilidae'
- 'Electrochaerilus buckleyi belongs to Electrochaerilus'
- 'Electrochelifer belongs to Cheliferidae'
- 'Electrocteniza belongs to Ctenizidae'
- 'Electrocteniza sadilenkoi belongs to Electrocteniza'
- 'Electrophrynidae is a subjective synonym of Phrynidae'
- 'Electrophrynus belongs to Phrynidae'
- 'Electrophrynus mirus belongs to Electrophrynus'
- 'Eleutherengonides belongs to Prostigmata'
- 'Elucus is a subjective synonym of Anandrus'
- 'Elucus inermis is recombined as Anandrus inermis'
- 'Elucus infelix is recombined as Anandrus infelix'
- 'Elucus redemptus is recombined as Anandrus redemptus'
- 'Elvina belongs to Araneomorphae'
- 'Embolacarus belongs to Collohmanniidae'
- 'Enacrosoma belongs to Araneidae'
- 'Enarthronota belongs to Oribatida'
- 'Endeostigmata belongs to Sarcoptiformes'
- 'Entelecara jacksoni belongs to Entelecara' according to Pickard-Cambridge 1902
- 'Entelecara jacksoni is recombined as Hypselistes jacksoni'
- 'Entelegynae belongs to Araneoclada'
- 'Entomocephalus is a subjective synonym of Myrmarachne'
- 'Entomocephalus formicoides is recombined as Myrmarachne formicoides'
- 'Eoaraneus belongs to Araneidae'
- 'Eoarchaea belongs to Archaeidae'
- 'Eoasagena belongs to Theridiidae'
- 'Eoattopsis belongs to Salticidae'
- 'Eoatypus belongs to Opisthothelae'
- 'Eoatypus woodwardii belongs to Eoatypus'
- 'Eobrommella belongs to Dictynidae'
- 'Eobumbatrix belongs to Clubionidae'
- 'Eobuthidae belongs to Isobuthoidea'
- 'Eobuthus belongs to Eobuthidae'
- 'Eobuthus cordai belongs to Eobuthus'
- 'Eobuthus holti belongs to Eobuthus'
- 'Eobuthus pottsvillensis is recombined as Opsieobuthus pottsvillensis'
- 'Eobuthus rakovnicensis belongs to Eobuthus'
- 'Eocarcinosoma belongs to Carcinosomatidae'
- 'Eochorizopes belongs to Araneidae'
- 'Eocoddingtonia belongs to Theridiosomatidae'
- 'Eocoddingtonia eskovi belongs to Eocoddingtonia'
- 'Eocryphoeca belongs to Dictynidae'
- 'Eocryphoeca distincta is a nomen dubium'
- 'Eocryphoeca parva is recombined as Tetragnatha parva'
- 'Eocryphoecara belongs to Dictynidae'
- 'Eocteniza belongs to Arthrolycosidae'
- 'Eocteniza silvicola belongs to Eocteniza'
- 'Eoctonidae belongs to Eoctonoidea'
- 'Eoctonoidea belongs to Holosternina'
- 'Eoctonus belongs to Eoctonidae'
- 'Eoctonus miniatus belongs to Eoctonus'
- 'Eocydrele belongs to Zodariidae'
- 'Eodictyna belongs to Dictynidae'
- 'Eodiplurina belongs to Nemesiidae'
- 'Eodiplurina cockerelli belongs to Eodiplurina'
- 'Eodipoena is a subjective synonym of Eomysmena'
- 'Eodipoena baltica is recombined as Eomysmena baltica'
- 'Eodipoena bassleri is recombined as Eomysmena bassleri'
- 'Eodipoena consulta is a subjective synonym of Eomysmena moritura'
- 'Eodipoena oculata is recombined as Eomysmena oculata'
- 'Eodoter belongs to Clubionidae'
- 'Eoepeirotypus belongs to Theridiosomatidae'
- 'Eogamasomorpha belongs to Tetrablemmidae'
- 'Eognaphosops belongs to Gnaphosidae'
- 'Eogonatium is a subjective synonym of Acrometa'
- 'Eogonatium minutum is recombined as Acrometa minutum'
- 'Eogonatium robustum is replaced by Acrometa pseudorobusta'
- 'Eogonatium succini is recombined as Acrometa succini'
- 'Eohahnia belongs to Hahniidae'
- 'Eohalinobius belongs to Succinomidae'
- 'Eolabulla belongs to Linyphiidae'
- 'Eolathys belongs to Dictynidae'
- 'Eolathys debilis belongs to Eolathys'
- 'Eolathys succini belongs to Eolathys'
- 'Eoleptoneta belongs to Leptonetidae'
- 'Eolinus belongs to Salticidae'
- 'Eolinus succineus belongs to Eolinus'
- 'Eolinus theryi belongs to Eolinus'
- 'Eolinus tystschenkoi belongs to Eolinus'
- 'Eolycosa belongs to Arthromygalidae'
- 'Eolycosa lorenzi belongs to Eolycosa'
- 'Eolyrifer belongs to Theridiidae'
- 'Eomactator belongs to Gnaphosidae'
- 'Eomatachia belongs to Zoropsidae'
- 'Eomatachia latifrons belongs to Eomatachia'
- 'Eomazax belongs to Corinnidae'
- 'Eometa belongs to Tetragnathidae'
- 'Eometa aberrans belongs to Eometa' according to Petrunkevitch 1958
- 'Eometa aberrans is a nomen dubium'
- 'Eometa robusta belongs to Eometa' according to Petrunkevitch 1958
- 'Eometa robusta is a nomen dubium'
- 'Eomiagrammopes belongs to Uloboridae'
- 'Eomysmauchenius belongs to Archaeidae'
- 'Eomysmena belongs to Theridiidae'
- 'Eomysmena asta belongs to Eomysmena'
- 'Eomysmena moritura belongs to Eomysmena'
- 'Eomysmena succini is a nomen dubium'
- 'Eomysmenopsis belongs to Mysmenidae'
- 'Eonephila belongs to Nephilidae'
- 'Eophalangium belongs to Eupnoi'
- 'Eophantes belongs to Linyphiidae'
- 'Eopholcus belongs to Archaeometidae'
- 'Eopholcus pedatus belongs to Eopholcus'
- 'Eophrynidae belongs to Trigonotarbida'
- 'Eophrynus belongs to Eophrynidae'
- 'Eophrynus jugatus is a subjective synonym of Pleophrynus verrucosus'
- 'Eophrynus pococki is recombined as Pseudokreischeria pococki'
- 'Eophrynus varius is a subjective synonym of Pseudokreischeria pococki'
- 'Eophrynus waechteri is a subjective synonym of Aphantomartus areolatus'
- 'Eophrynus warei is a subjective synonym of Pleophrynus verrucosus'
- 'Eopisaurella belongs to Pisauridae'
- 'Eoplectreurys belongs to Plectreuridae'
- 'Eoplectreurys gertschi belongs to Eoplectreurys'
- 'Eopopino belongs to Nesticidae'
- 'Eopopino longipes belongs to Eopopino'
- 'Eoprychia belongs to Zoropsidae'
- 'Eopsiloderces belongs to Ochyroceratidae'
- 'Eopsiloderces loxosceloides belongs to Eopsiloderces'
- 'Eopsilodercidae is a subjective synonym of Ochyroceratidae'
- 'Eoscaphiella belongs to Tetrablemmidae'
- 'Eoscorpionidae is corrected as Eoscorpiidae and belongs to Isobuthoidea'
- 'Eoscorpius belongs to Eoscorpiidae'
- 'Eoscorpius (Mazonia) wardingleyi is recombined as Mazonia wardingleyi'
- 'Eoscorpius anglicus is recombined as Palaeomachus anglicus'
- 'Eoscorpius bornaensis belongs to Eoscorpius'
- 'Eoscorpius carbonarius belongs to Eoscorpius'
- 'Eoscorpius casei belongs to Eoscorpius'
- 'Eoscorpius danielsi is recombined as Kronoscorpio danielsi'
- 'Eoscorpius euglyptus is recombined as Centromachus euglyptus'
- 'Eoscorpius glaber is recombined as Archaeoctonus glaber'
- 'Eoscorpius granulosus is a subjective synonym of Eoscorpius carbonarius'
- 'Eoscorpius mucronatus belongs to Eoscorpius'
- 'Eoscorpius sparthensis belongs to Eoscorpius'
- 'Eoscorpius tuberculatus is recombined as Benniescorpio tuberculatus'
- 'Eoscorpius typicus is a subjective synonym of Eoscorpius carbonarius'
- 'Eostaianus belongs to Sparassidae'
- 'Eostaianus succini belongs to Eostaianus'
- 'Eostasina belongs to Sparassidae'
- 'Eostasina aculeata belongs to Eostasina'
- 'Eostentatrix belongs to Clubionidae'
- 'Eostentatrix cockerelli belongs to Eostentatrix'
- 'Eosynotaxus belongs to Synotaxidae'
- 'Eotarbus is replaced by Palaeotarbus'
- 'Eotarbus is a nomen dubium'
- 'Eotarbus jerami is recombined as Palaeotarbus jerami'
- 'Eotarbus litoralis is a nomen dubium'
- 'Eoteutana belongs to Theridiidae'
- 'Eothanatus belongs to Philodromidae'
- 'Eothanatus diritatis belongs to Eothanatus'
- 'Eothele is replaced by Palaeothele'
- 'Eothele montceauensis is recombined as Palaeothele montceauensis'
- 'Eotheridiosoma belongs to Theridiosomatidae'
- 'Eotrechalea belongs to Trechaleidae'
- 'Eotrochanteria belongs to Trochanteriidae'
- 'Eotrogulidae belongs to Troguloidea'
- 'Eotrogulus belongs to Eotrogulidae'
- 'Eotrogulus fayoli belongs to Eotrogulus'
- 'Eoversatrix belongs to Clubionidae'
- 'Eozygiella belongs to Araneidae'
- 'Epeira is a subjective synonym of Araneus'
- 'Epeira abscondita is recombined as Araneus absconditus'
- 'Epeira cinefacta is recombined as Araneus cinefactus'
- 'Epeira delita is recombined as Araneus delitus'
- 'Epeira emertoni is recombined as Araneus emertoni'
- 'Epeira eogena is a nomen nudum'
- 'Epeira indistincta is replaced by Araneus kinchloeae'
- 'Epeira longimana is recombined as Araneus longimanus'
- 'Epeira meekii is recombined as Araneus meeki'
- 'Epeira molassica is recombined as Araneus molassicus'
- 'Epeira troschelii is recombined as Araneus troschelii'
- 'Epeira vulcanalis is recombined as Araneus vulcanalis'
- 'Epeiridion is a nomen nudum'
- 'Epeiridion femoratum is a nomen nudum'
- 'Epeiridae is a subjective synonym of Araneidae'
- 'Ephalmator belongs to Ephalmatoridae'
- 'Ephalmator fossilis belongs to Ephalmator'
- 'Ephalmatoridae belongs to Clubionoidea'
- 'Epicriiae belongs to Gamasina'
- 'Epiochierata belongs to Chelonethi'
- 'Episinus belongs to Theridiidae'
- 'Episinus balticus belongs to Episinus'
- 'Episinus brevipalpus belongs to Episinus'
- 'Episinus cornutus belongs to Episinus'
- 'Episinus eskovi belongs to Episinus'
- 'Eremaeidae belongs to Zetorchestoidea'
- 'Eremaeus belongs to Eremaeidae'
- 'Eremaeus denaius is recombined as Parapimodus denaius'
- 'Eremaeus oblongus belongs to Eremaeus' according to Koch 1836
- 'Eremaeus oblongus belongs to Eremaeus'
- 'Eresoidea belongs to Entelegynae'
- 'Eresoides belongs to Araneae'
- 'Eresoides orbicularis belongs to Eresoides'
- 'Eresus curtipes is a subjective synonym of Adorator hispidus'
- 'Eresus monachus is a subjective synonym of Adorator hispidus'
- 'Eriauchenius belongs to Archaeidae'
- 'Erigolipus belongs to Cyatholipidae'
- 'Erigone belongs to Linyphiidae'
- 'Erigone atra belongs to Erigone' according to Blackwall 1833
- 'Erigone atra belongs to Erigone'
- 'Erigone dechenii belongs to Erigone'
- 'Erigone stigmatosa is recombined as Pseudoteutana stigmatosa'
- 'Eriophyidae belongs to Eriophyoidea'
- 'Eriophyoidea belongs to Eupodides'
- 'Erithus is a nomen nudum'
- 'Erithus applanatus is a nomen nudum'
- 'Ero belongs to Mimetidae'
- 'Ero carboneana belongs to Ero'
- 'Ero coronata is a nomen nudum'
- 'Ero exculpta is a nomen nudum'
- 'Ero permunda belongs to Ero'
- 'Ero quadripunctata is a nomen nudum'
- 'Ero setulosa is a nomen dubium'
- 'Erythraeidae belongs to Erythraeoidea'
- 'Erythraeoidea belongs to Erythraiae'
- 'Erythraeus belongs to Erythraeidae'
- 'Erythraiae belongs to Parasitengona'
- 'Eskiscorpio belongs to Eoscorpiidae'
- 'Eskiscorpio parvus belongs to Eskiscorpio'
- 'Esuritor belongs to Trechaleidae'
- 'Esuritor spinipes belongs to Esuritor'
- 'Euamblypygi belongs to Amblypygi'
- 'Euophrys belongs to Salticidae'
- 'Euophrys randeckensis belongs to Euophrys'
- 'Eupelops belongs to Phenopelopidae'
- 'Euphrynus salmi is recombined as Stenotrogulus salmii'
- 'Euphthiracaroidea belongs to Eupyctima'
- 'Eupnoi belongs to Opiliones'
- 'Eupodides belongs to Prostigmata'
- 'Eupodoidea belongs to Eupodides'
- 'Euproopidae belongs to Bellinurina'
- 'Euproops belongs to Euproopidae'
- 'Euproops kilmersdonensis is a subjective synonym of Euproops danae'
- 'Eupyctima belongs to Mixonomata'
- 'Europhthalmus is a subjective synonym of Eoscorpius'
- 'Europhthalmus longimanus is a subjective synonym of Eoscorpius mucronatus'
- 'Eurymarti is a subjective synonym of Trigonotarbida'
- 'Eurymartidae is an invalid subgroup of Trigonotarbida'
- 'Eurymartus is a nomen dubium'
- 'Eurymartus latus is a nomen dubium'
- 'Eurymartus spinulosus is a nomen dubium'
- 'Euryopis belongs to Theridiidae'
- 'Euryopis baltica is recombined as Lasaeola baltica'
- 'Euryopus belongs to Theridiidae'
- 'Euryopus gracilipes belongs to Euryopus'
- 'Eurypterina belongs to Eurypterida'
- 'Eurypteroidea belongs to Eurypterina'
- 'Eurypterus (Adelophthalmus) granosus is recombined as Adelophthalmus granosus'
- 'Eurypterus douvillei is recombined as Adelophthalmus douvillei'
- 'Eurypterus imhofi is recombined as Adelophthalmus imhofi'
- 'Eurypterus mansfieldi is recombined as Adelophthalmus mansfieldi'
- 'Eurypterus minor is recombined as Pentlandopterus minor'
- 'Eurypterus pennsylvanicus is recombined as Adelophthalmus pennsylvanicus'
- 'Eurypterus salmii is recombined as Campylocephalus salmi'
- 'Eurypterus scoticus is recombined as Carcinosoma scoticus'
- 'Eurypterus stoermeri is an invalid subgroup of Eurypterus'
- 'Eusarcana belongs to Carcinosomatidae'
- 'Eusparassidae is a subjective synonym of Sparassidae'
- 'Eusparassus belongs to Sparassidae'
- 'Eustaloides is a subjective synonym of Graea'
- 'Eustaloides calceatus is recombined as Graea calceatus'
- 'Eustaloides minor is recombined as Graea minor'
- 'Eustaloides setosus is recombined as Graea setosa'
- 'Eustaloides succini is recombined as Graea succini'
- 'Euzetes belongs to Euzetidae'
- 'Euzetidae belongs to Ceratozetoidea'
- 'Evagoratus belongs to Salticidae'
- 'Exapinurus schrenki belongs to Exapinurus' according to Nieszkowski 1859
- 'Exoripoda chiapasensis is recombined as Benoibates chiapasensis'
- 'Eylaoidea belongs to Hydracarnidiae'
- 'Eysyslopterus belongs to Adelophthalmidae'
- 'Eyukselus is a nomen nudum'
- 'Facundia belongs to Thomisidae'
- 'Facundia clara belongs to Facundia'
- 'Faiditus belongs to Theridiidae'
- 'Feaelloidea belongs to Epiochierata'
- 'Feistmantelia belongs to Isobuthidae'
- 'Feistmantelia ornata belongs to Feistmantelia'
- 'Femurraptor belongs to Theridiidae'
- 'Fictotama is a nomen dubium'
- 'Fictotama extincta is a nomen dubium'
- 'Fiducia belongs to Thomisidae'
- 'Fiducia tenuipes belongs to Fiducia'
- 'Filiauchenius belongs to Archaeidae'
- 'Filiola is replaced by Filiolella'
- 'Filiola argentata is recombined as Filiolella argentata'
- 'Filiolella belongs to Thomisidae'
- 'Filistatidae belongs to Haplogynae'
- 'Flagellanapis belongs to Anapidae'
- 'Flagelldictyna belongs to Dictynidae'
- 'Flegia is a subjective synonym of Episinus'
- 'Flegia longimana is recombined as Episinus longimanus'
- 'Flegia succini is a subjective synonym of Pseudoteutana stigmatosa'
- 'Floricomus belongs to Linyphiidae'
- 'Floricomus fossilis belongs to Floricomus'
- 'Fossilanapis belongs to Anapidae'
- 'Fossilaraneus belongs to Araneidae'
- 'Fossilopaea belongs to Oonopidae'
- 'Fossilopaea sulci belongs to Fossilopaea'
- 'Friularachne belongs to Atypoidea'
- 'Friularachne rigoi belongs to Friularachne'
- 'Furcembolus belongs to Ochyroceratidae'
- 'Gallioscorpio belongs to Gallioscorpionidae'
- 'Gallioscorpionidae belongs to Mesophonoidea'
- 'Galumnoidea belongs to Brachypylina'
- 'Gamasida is a subjective synonym of Mesostigmata'
- 'Gamasina belongs to Monogynaspida'
- 'Gamasomorpha incerta is recombined as Stenoonops incertus'
- 'Garcorops belongs to Selenopidae'
- 'Garnettiidae belongs to Eoctonoidea'
- 'Garnettius belongs to Garnettiidae'
- 'Garypinidae belongs to Garypoidea'
- 'Garypinus belongs to Garypinidae'
- 'Garypoidea belongs to Panctenata'
- 'Garypus burmiticus is recombined as Amblyolpium burmiticum'
- 'Gea belongs to Araneidae'
- 'Gea epeiroidea is recombined as Graea epeiroidea'
- 'Gea obscura is recombined as Clya obscura'
- 'Gehypochthoniidae belongs to Parhypochthonioidea'
- 'Gelasinotarbus belongs to Palaeocharinidae'
- 'Gelasinotarbus fimbriunguis is recombined as Attercopus fimbriunguis'
- 'Geogarypidae belongs to Garypoidea'
- 'Geogarypus belongs to Geogarypidae'
- 'Geralinura belongs to Uropygi'
- 'Geralinura britannica belongs to Geralinura'
- 'Geralinura carbonaria belongs to Geralinura'
- 'Geralinura crassa is a subjective synonym of Prothelyphonus bohemicus'
- 'Geralinura gigantea is a subjective synonym of Geralinura carbonaria'
- 'Geralinura noctua is a subjective synonym of Prothelyphonus bohemicus'
- 'Geralinura scudderi is a subjective synonym of Prothelyphonus bohemicus'
- 'Geralinura similis is a subjective synonym of Geralinura carbonaria'
- 'Geralinura sutcliffei is recombined as Heloscorpio sutcliffei'
- 'Geralycosa belongs to Arthromygalidae'
- 'Geralycosa fritschi belongs to Geralycosa'
- 'Geraphrynus angulatus is recombined as Goniotarbus angulatus'
- 'Geraphrynus angustus is recombined as Mesotarbus angustus'
- 'Geraphrynus eggintoni is recombined as Mesotarbus eggintoni'
- 'Geraphrynus hindi is recombined as Mesotarbus hindi'
- 'Geraphrynus torpedo is recombined as Leptotarbus torpedo'
- 'Geraphrynus tuberculatus is recombined as Goniotarbus tuberculatus'
- 'Geratarbus belongs to Architarbidae'
- 'Geratarbus lacoei belongs to Geratarbus'
- 'Geratarbus minutus is recombined as Orthotarbus minutus'
- 'Geratarbus scabrum is recombined as Curculioides scaber'
- 'Geratonephila belongs to Nephilidae'
- 'Gerdia belongs to Hersiliidae'
- 'Gerdia myura belongs to Gerdia'
- 'Gerdiopsis belongs to Hersiliidae'
- 'Gerdiorum belongs to Hersiliidae'
- 'Gibbermastigusa belongs to Dictynidae'
- 'Gibbersynotaxus belongs to Synotaxidae'
- 'Gigantocharinus belongs to Palaeocharinidae'
- 'Gigantoscorpio belongs to Gigantoscorpionidae'
- 'Gigantoscorpio willsi belongs to Gigantoscorpio'
- 'Gigantoscorpionidae belongs to Gigantoscorpionoidea'
- 'Gigantoscorpionoidea belongs to Holosternina'
- 'Gilboarachne belongs to Palaeocharinidae'
- 'Glaesacaridae belongs to Astigmata'
- 'Glaesacarus belongs to Glaesacaridae'
- 'Globulidion belongs to Theridiidae'
- 'Glyptoscorpius is a subjective synonym of Adelophthalmus'
- 'Glyptoscorpius kidstoni is recombined as Adelophthalmus kidstoni' according to Peach 1888
- 'Glyptoscorpius kidstoni is recombined as Adelophthalmus kidstoni'
- 'Glyptoscorpius perornatus is recombined as Adelophthalmus perornatus'
- 'Gnaphosa belongs to Gnaphosidae'
- 'Gnaphosidae belongs to Gnaphosoidea'
- 'Gnaphosoidea belongs to Orbiculariae'
- 'Gonatium belongs to Linyphiidae'
- 'Gondwanarachne belongs to Kreischeriidae'
- 'Goniotarbus belongs to Architarbidae'
- 'Gonyleptes nemastomoides is recombined as Proholoscotolemon nemastomoides'
- 'Gorgopsis is replaced by Gorgopsina'
- 'Gorgopis jucunda is recombined as Gorgopsina jucunda'
- 'Gorgopsidis belongs to Salticidae'
- 'Gorgopsina belongs to Salticidae'
- 'Gorgopsis naumanni is recombined as Gorgopsina naumanni'
- 'Gradidorsum belongs to Eremaeidae'
- 'Graea belongs to Araneidae'
- 'Graeophonus belongs to Paracharontidae'
- 'Graeophonus anglicus belongs to Graeophonus'
- 'Graeophonus scudderi belongs to Graeophonus'
- 'Grammonota deformans is recombined as Ceratinopsis deformans'
- 'Grandoculidae belongs to Palpimanoidea'
- 'Grandoculus belongs to Grandoculidae'
- 'Grandoculus chemahawinensis belongs to Grandoculus'
- 'Grassatores belongs to Laniatores'
- 'Gustavioidea belongs to Brachypylina'
- 'Gymnodamaeidae belongs to Plateremaeoidea'
- 'Gymnodamaeus belongs to Gymnodamaeidae'
- 'Gymnoscorpius belongs to Scorpiones'
- 'Hadrachne belongs to Architarbidae'
- 'Hadrachne horribilis belongs to Hadrachne'
- 'Hahniidae belongs to Dictynoidea'
- 'Halitherses belongs to Troguloidea'
- 'Haplogynae belongs to Araneoclada'
- 'Hardieopteridae belongs to Kokomopteroidea'
- 'Hardieopterus belongs to Hardieopteridae'
- 'Harpactea belongs to Dysderidae'
- 'Harpactes is replaced by Harpactea'
- 'Harpactes extinctus is recombined as Harpactea extincta'
- 'Heliophanus belongs to Salticidae'
- 'Heliophanus extinctus belongs to Heliophanus'
- 'Heloscorpio belongs to Heloscorpionidae'
- 'Heloscorpionidae belongs to Mesophonoidea'
- 'Hemictenata belongs to Iocheirata'
- 'Hemikreischeria belongs to Kreischeriidae'
- 'Hemiphrynidae is a subjective synonym of Eophrynidae'
- 'Hemiphrynus is replaced by Nyranytarbus'
- 'Hemiphrynus hofmanni is recombined as Nyranytarbus hofmanni'
- 'Hemiphrynus longipes is recombined as Nyranytarbus longipes'
- 'Hemirraghus belongs to Theraphosidae'
- 'Hemiscorpiidae belongs to Chactoidea'
- 'Hermanniella belongs to Hermanniellidae'
- 'Hermanniellidae belongs to Hermannielloidea'
- 'Hermannielloidea belongs to Brachypylina'
- 'Herselioides belongs to Araneae'
- 'Herselioides thanatiformis belongs to Herselioides'
- 'Hersilia belongs to Hersiliidae'
- 'Hersilia aquisextana belongs to Hersilia'
- 'Hersilia miranda belongs to Hersilia'
- 'Hersiliana belongs to Hersiliidae'
- 'Hersiliidae belongs to Eresoidea'
- 'Hersiliopsis is a subjective synonym of Hersilia'
- 'Hersiliopsis madagascariensis is recombined as Hersilia madagascariensis'
- 'Heteromma intersecta is a nomen nudum'
- 'Heteronesticus belongs to Nesticidae'
- 'Heteroonops belongs to Oonopidae'
- 'Heteropoda belongs to Sparassidae'
- 'Heterostigmatina belongs to Eleutherengonides'
- 'Heterotarbidae belongs to Phalangiotarbida'
- 'Heterotarbus belongs to Heterotarbidae'
- 'Heterotarbus ovatus belongs to Heterotarbus'
- 'Heterotmarus belongs to Thomisidae'
- 'Heterotmarus altus belongs to Heterotmarus'
- 'Heurtaultia belongs to Cheliferidae'
- 'Hevila is an objective synonym of Curculioides'
- 'Hexathelidae belongs to Mygalomorphae'
- 'Hexuridae is a subjective synonym of Mecicobothriidae'
- 'Hibbertopteridae belongs to Hibbertopteroidea'
- 'Hibbertopteroidea belongs to Stylonurina'
- 'Hirsutipalpus belongs to Theridiidae'
- 'Hispaniolyna belongs to Dictynidae'
- 'Hispaniolyna hirsuta belongs to Hispaniolyna'
- 'Hispaniolyna magna belongs to Hispaniolyna'
- 'Hispanonesticus belongs to Nesticidae'
- 'Histopona belongs to Agelenidae'
- 'Histopona anthracina belongs to Histopona'
- 'Histricostoma belongs to Nemastomatidae'
- 'Holmipterus belongs to Eurypterida'
- 'Holosternina was reranked as a suborder and belongs to Scorpiones'
- 'Homalometa belongs to Tetragnathidae'
- 'Hoploderma is a subjective synonym of Phthiracarus'
- 'Hoploderma multipunctatum is recombined as Phthiracarus multipunctatus'
- 'Hubbardiidae belongs to Schizomida'
- 'Hubeiscorpio belongs to Scorpiones'
- 'Huergina belongs to Tetragnathidae'
- 'Huergina diazromerali belongs to Huergina'
- 'Hummelinckiolus belongs to Samoidae'
- 'Huttoniidae belongs to Palpimanoidea'
- 'Hydracarnidiae belongs to Parasitengona'
- 'Hydroscorpionidae is a subjective synonym of Proscorpiidae'
- 'Hydroscorpius belongs to Proscorpiidae'
- 'Hydroscorpius denisoni belongs to Hydroscorpius'
- 'Hydrozetes smithi is recombined as Mochloribatula smithi'
- 'Hydrozetidae belongs to Hydrozetoidea'
- 'Hydrozetoidea belongs to Brachypylina'
- 'Hyllus belongs to Salticidae'
- 'Hypochthoniidae belongs to Hypochthonioidea'
- 'Hypochthonioidea belongs to Enarthronota'
- 'Hypognatha belongs to Araneidae'
- 'Hypotheridiosoma belongs to Theridiosomatidae'
- 'Hypselistes belongs to Linyphiidae'
- 'Hyptiomopes belongs to Uloboridae'
- 'Hyptiotes belongs to Uloboridae'
- 'Iardinidis belongs to Synaphridae'
- 'Idiogaryops belongs to Sternophoridae'
- 'Idmonia is a nomen nudum'
- 'Idmonia virginea is a nomen nudum'
- 'Impulsor is a subjective synonym of Episinus'
- 'Impulsor neglectus is recombined as Episinus neglectus'
- 'Inceptor belongs to Agelenidae'
- 'Inceptor aculeatus belongs to Inceptor'
- 'Inceptor dubius belongs to Inceptor'
- 'Inceptoridae is a subjective synonym of Agelenidae'
- 'Insecutor belongs to Insecutoridae'
- 'Insecutor aculeatus belongs to Insecutor'
- 'Insecutor mandibulatus belongs to Insecutor'
- 'Insecutor rufus belongs to Insecutor'
- 'Insecutoridae belongs to Lycosoidea'
- 'Insidiatores belongs to Laniatores'
- 'Iocheirata belongs to Chelonethi'
- 'Ischnocolinopsis belongs to Theraphosidae'
- 'Ischnocolinopsis acutus belongs to Ischnocolinopsis'
- 'Ischnothele belongs to Dipluridae'
- 'Ischyropsalidoidea belongs to Dyspnoi'
- 'Isobuthidae belongs to Isobuthoidea'
- 'Isobuthoidea belongs to Lobosternina'
- 'Isobuthus belongs to Isobuthidae'
- 'Isobuthus nyranensis belongs to Isobuthus'
- 'Ixodes belongs to Ixodidae'
- 'Ixodes tertiarius is a nomen dubium'
- 'Ixodida was reranked as a suborder and belongs to Parasitiformes'
- 'Ixodidae belongs to Ixodoidea'
- 'Ixodoidea belongs to Ixodida'
- 'Jaekelopterus belongs to Pterygotidae'
- 'Jerseyuloborus belongs to Uloboridae'
- 'Juraraneidae belongs to Araneoidea'
- 'Jurarchaea belongs to Archaeidae'
- 'Kiaeria limuloides belongs to Kiaeria' according to Stoermer 1934
- 'Kimula belongs to Kimulidae'
- 'Kimulidae belongs to Samoidea'
- 'Kochiuridion belongs to Theridiidae'
- 'Kokomopteroidea belongs to Stylonurina'
- 'Komisumena belongs to Thomisidae'
- 'Korearachne belongs to Lycosoidea'
- 'Kreischeria belongs to Kreischeriidae'
- 'Kreischeria bohemica is recombined as Anthracomartus bohemica'
- 'Kreischeria geinitzi is recombined as Hemikreischeria geinitzi'
- 'Kreischeria thevenini is recombined as Anzinia thevenini'
- 'Kreischeria verrucosa is recombined as Pleophrynus verrucosus'
- 'Kreischeria villeti is a subjective synonym of Aphantomartus pustulatus'
- 'Kreischeria wiedei belongs to Kreischeria'
- 'Kreischeriidae belongs to Trigonotarbida'
- 'Kronoscorpio belongs to Kronoscorpionidae'
- 'Kronoscorpionidae belongs to Isobuthoidea'
- 'Kustarachne belongs to Eupnoi'
- 'Kustarachne conica is a subjective synonym of Kustarachne tenuipes'
- 'Kustarachne extincta is a subjective synonym of Kustarachne tenuipes'
- 'Kustarachne sulcata is recombined as Amarixys sulcata'
- 'Kustarachne tenuipes belongs to Kustarachne'
- 'Kustaria belongs to Arthromygalidae'
- 'Labidostoma (Pseudocornutella) is reassigned into Labidostomma'
- 'Labidostoma (Pseudocornutella) electri is recombined as Labidostomma (Pseudocornutella) electri'
- 'Labidostomma belongs to Labidostommatidae'
- 'Labidostomma paleoluteum is recombined as Labidostomma (Nicoletiella) paleoluteum'
- 'Labidostommatidae belongs to Labidostommatoidea'
- 'Labidostommatides belongs to Prostigmata'
- 'Labidostommatoidea belongs to Labidostommatides'
- 'Labriscorpio belongs to Proscorpiidae'
- 'Labriscorpio alliedensis belongs to Labriscorpio'
- 'Labriscorpionidae is a subjective synonym of Proscorpiidae'
- 'Lacunauchenius belongs to Archaeidae'
- 'Laelapidae belongs to Dermanyssoidea'
- 'Lagonoburmops belongs to Lagonomegopidae'
- 'Lagonomegopidae belongs to Palpimanoidea'
- 'Lagonomegops belongs to Lagonomegopidae'
- 'Lagonomegops americanus belongs to Lagonomegops'
- 'Lanarkopterus belongs to Mixopteridae'
- 'Laniatores belongs to Opiliones'
- 'Lasaeola belongs to Theridiidae'
- 'Laurieipterus belongs to Stylonuridae'
- 'Lebanoecobius belongs to Oecobiidae'
- 'Lebansegestria belongs to Segestriidae'
- 'Lechytia belongs to Lechytiidae'
- 'Lechytia tertiaria belongs to Lechytia'
- 'Lechytiidae belongs to Chthonioidea'
- 'Leclercera belongs to Ochyroceratidae'
- 'Leda is replaced by Steneattus'
- 'Leda promissa is recombined as Steneattus promissa'
- 'Legrandella lombardii belongs to Legrandella' according to Eldredge 1974
- 'Leiobunum belongs to Sclerosomatidae'
- 'Leiobunum inclusum is a subjective synonym of Leiobunum longipes'
- 'Leiobunum longipes belongs to Leiobunum'
- 'Leioscorpio is a subjective synonym of Compsoscorpius'
- 'Leioscorpio pseudobuthiformis is a subjective synonym of Compsoscorpius buthiformis'
- 'Lepthyphantes lamellatus is recombined as Custodela lamellata'
- 'Leptobunus atavus is recombined as Amauropilio atavus'
- 'Leptonetidae belongs to Haplogynae'
- 'Leptopholcus belongs to Pholcidae'
- 'Leptotarbus belongs to Architarbidae'
- 'Leptus belongs to Erythraeidae'
- 'Leviunguis belongs to Theridiosomatidae'
- 'Liacaridae belongs to Gustavioidea'
- 'Liassoscorpionidae is an invalid subgroup of Scorpiones'
- 'Liassoscorpionides belongs to Scorpiones'
- 'Libellula carbonaria is recombined as Graeophonus carbonarius'
- 'Lichnophthalmus is a subjective synonym of Eoscorpius'
- 'Lichnophthalmus pulcher is recombined as Eoscorpius pulcher'
- 'Lichnoscorpius is a subjective synonym of Compsoscorpius'
- 'Lichnoscorpius minutus is a subjective synonym of Compsoscorpius buthiformis'
- 'Liebstadia belongs to Scheloribatidae'
- 'Liebstadia durhami is recombined as Scheloribates durhami'
- 'Limnochares belongs to Limnocharidae'
- 'Limnochares antiquus is a nomen dubium'
- 'Limnocharidae belongs to Eylaoidea'
- 'Limuloides optatus belongs to Limuloides' according to Salter 1872
- 'Limuloides speratus belongs to Limuloides' according to Woodward 1872
- 'Limuloides tuberculatus belongs to Limuloides' according to Salter 1872
- 'Linoptes belongs to Trechaleidae'
- 'Linoptes oculeus belongs to Linoptes'
- 'Linyphia belongs to Linyphiidae'
- 'Linyphia andraei belongs to Linyphia'
- 'Linyphia cheiracantha is recombined as Custodela cheiracantha'
- 'Linyphia florissanti belongs to Linyphia'
- 'Linyphia oblonga is recombined as Custodela oblonga'
- 'Linyphia pachygnathoides belongs to Linyphia'
- 'Linyphia quievreuxi belongs to Linyphia'
- 'Linyphia retensa belongs to Linyphia'
- 'Linyphia rottensis belongs to Linyphia'
- 'Linyphiidae belongs to Araneoidea'
- 'Liocranidae belongs to Dictynoidea'
- 'Liomesaspis belongs to Euproopidae'
- 'Liomesaspis laevis belongs to Liomesaspis'
- 'Lissomartidae belongs to Trigonotarbida'
- 'Lissomartus belongs to Lissomartidae'
- 'Lithyphantes anticus is recombined as Steatoda anticus'
- 'Liticen is a subjective synonym of Acrometa'
- 'Liticen setosus is recombined as Acrometa setosus'
- 'Loboarchaeoctonidae belongs to Loboarchaeoctonoidea'
- 'Loboarchaeoctonoidea belongs to Lobosternina'
- 'Loboarchaeoctonus belongs to Loboarchaeoctonidae'
- 'Loboarchaeoctonus squamosus belongs to Loboarchaeoctonus'
- 'Lobosterni is corrected as Lobosternina and belongs to Scorpiones'
- 'Loxosceles belongs to Sicariidae'
- 'Loxosceles defecta belongs to Loxosceles'
- 'Loxosceles deformis belongs to Loxosceles'
- 'Loxoscelidae is a subjective synonym of Sicariidae'
- 'Lupettiana belongs to Anyphaenidae'
- 'Luxurionephila belongs to Nephilidae'
- 'Lycosa belongs to Lycosidae'
- 'Lycosa florissanti belongs to Lycosa'
- 'Lycosa lithographica belongs to Lycosa'
- 'Lycosa miocaena belongs to Lycosa'
- 'Lycosidae belongs to Lycosoidea'
- 'Lycosoidea belongs to Orbiculariae'
- 'Lycosoides is replaced by Timeropus'
- 'Lycosoides hersiliformis is recombined as Timeropus hersiliformis'
- 'Lyssomanes belongs to Salticidae'
- 'Lyssomanes pristinus belongs to Lyssomanes'
- 'Lyssomanes pulcher belongs to Lyssomanes'
- 'Micaria ovata is a nomen nudum'
- 'Macaria procera is recombined as Micaria procera'
- 'Micaria squamata is a nomen nudum'
- 'Macaria tenella is recombined as Micaria tenella'
- 'Micaria tenuis is a nomen nudum'
- 'Machilla belongs to Clubionidae'
- 'Macrogyion belongs to Eupnoi'
- 'Macryphantes belongs to Tetragnathidae'
- 'Macryphantes cowdeni belongs to Macryphantes'
- 'Madagascarphantes belongs to Linyphiidae'
- 'Maevia belongs to Salticidae'
- 'Magnaranea is a subjective synonym of Argiope'
- 'Magnaranea furva is recombined as Argiope furva'
- 'Maiocercus belongs to Anthracomartidae'
- 'Maiocercus orbicularis is a subjective synonym of Maiocercus celticus'
- 'Malepellis belongs to Linyphiidae'
- 'Malepellis extincta belongs to Malepellis'
- 'Malleator is a subjective synonym of Episinus'
- 'Malleator niger is a subjective synonym of Episinus longimanus'
- 'Marsupipterus belongs to Eurypterida'
- 'Massula belongs to Clubionidae'
- 'Massula klebsi belongs to Massula'
- 'Masteria belongs to Dipluridae'
- 'Mastigusa belongs to Dictynidae'
- 'Mastigusa acuminata belongs to Mastigusa'
- 'Mazonia belongs to Mazoniidae'
- 'Mazonia hungerfordi is recombined as Garnettius hungerfordi'
- 'Mazonia woodiana belongs to Mazonia'
- 'Mazonidae is corrected as Mazoniidae and belongs to Mesophonoidea'
- 'Mazoniscorpio is a subjective synonym of Palaeobuthus'
- 'Mazoniscorpio mazonensis is a subjective synonym of Palaeobuthus distinctus'
- 'Mecicobothriidae belongs to Mygalomorphae'
- 'Mecysmaucheniidae belongs to Palpimanoidea'
- 'Medela belongs to Theridiidae'
- 'Medela baltica belongs to Medela'
- 'Mediolata belongs to Stigmaeidae'
- 'Mediolata eocenica belongs to Mediolata'
- 'Meditrina belongs to Araneidae'
- 'Meditrina circumvallata belongs to Meditrina'
- 'Megalostrata belongs to Corinnidae'
- 'Megalostrata grandis belongs to Megalostrata'
- 'Megameropsis belongs to Trombidiae'
- 'Megameropsis aquensis belongs to Megameropsis'
- 'Meioneta belongs to Linyphiidae'
- 'Melanites is a subjective synonym of Tethneus'
- 'Melanites orbiculatus is recombined as Tethneus orbiculatus'
- 'Melanophora concinna is recombined as Zelotes concinna'
- 'Melanophora lepida is a nomen nudum'
- 'Melanophora mundula is recombined as Zelotes mundula'
- 'Melanophora nitida is a nomen nudum'
- 'Melanophora nobilis is a subjective synonym of Zelotes mundula'
- 'Melanophora regalis is recombined as Zelotes regalis'
- 'Memoratrix is a nomen dubium'
- 'Memoratrix rydei belongs to Memoratrix' according to Petrunkevitch 1942
- 'Memoratrix rydei is a nomen dubium'
- 'Menneus belongs to Deinopidae'
- 'Meristosternina was reranked as a suborder and belongs to Scorpiones'
- 'Mesarania belongs to Araneoidea'
- 'Mesobunus belongs to Sclerosomatidae'
- 'Mesophonidae belongs to Mesophonoidea'
- 'Mesophonoidea belongs to Holosternina'
- 'Mesophonus belongs to Mesophonidae'
- 'Mesophonus bromsgroviensis is recombined as Willsiscorpio bromsgroviensis'
- 'Mesophonus gracilis is recombined as Stenoscorpio gracilis'
- 'Mesophonus opisthophthalmus is a subjective synonym of Mesophonus perornatus'
- 'Mesophonus perornatus belongs to Mesophonus'
- 'Mesophonus pseudogracilis is recombined as Stenoscorpio pseudogracilis'
- 'Mesophonus pulcherrimus belongs to Mesophonus'
- 'Mesoproctus belongs to Thelyphonidae'
- 'Mesostigmata belongs to Parasitiformes'
- 'Mesotarbus belongs to Architarbidae'
- 'Mesothelae belongs to Araneae'
- 'Mesozygiella belongs to Araneidae'
- 'Mesozygiella dunlopi belongs to Mesozygiella'
- 'Meta belongs to Tetragnathidae'
- 'Metatarbus belongs to Architarbidae'
- 'Metatarbus triangularis belongs to Metatarbus'
- 'Metatetranychus belongs to Tetranychidae'
- 'Miagrammopes belongs to Uloboridae'
- 'Micaria belongs to Gnaphosidae'
- 'Microcharmidae is a subjective synonym of Buthidae'
- 'Microcharmus belongs to Buthidae'
- 'Microcreagris belongs to Neobisiidae'
- 'Microcreagris koellneri belongs to Microcreagris'
- 'Microgyniina belongs to Monogynaspida'
- 'Microgynioidea belongs to Microgyniina'
- 'Microlabiidae belongs to Cyclophthalmoidea'
- 'Microlabis belongs to Microlabiidae'
- 'Microlabis sternbergii belongs to Microlabis'
- 'Microlinus belongs to Salticidae'
- 'Micropalpimanidae belongs to Palpimanoidea'
- 'Micropalpimanus belongs to Micropalpimanidae'
- 'Micropholcommatidae belongs to Palpimanoidea'
- 'Microsegestria belongs to Segestriidae'
- 'Microsteria is a subjective synonym of Masteria'
- 'Microsteria sexoculata is recombined as Masteria sexoculata'
- 'Microstigmatidae belongs to Mygalomorphae'
- 'Microtityus belongs to Buthidae'
- 'Micryphantes belongs to Linyphiidae'
- 'Micryphantes globulus is a nomen nudum'
- 'Micryphantes infulatus is recombined as Lasaeola infulata'
- 'Micryphantes molybdinus belongs to Micryphantes'
- 'Micryphantes regularis belongs to Micryphantes'
- 'Micryphantes turritus is a nomen nudum'
- 'Mictodipoena is a subjective synonym of Episinus'
- 'Mimetarchaea is a nomen dubium'
- 'Mimetarchaea gintaras belongs to Mimetarchaea' according to Eskov 1992
- 'Mimetarchaea gintaras is a nomen dubium'
- 'Mimetidae belongs to Palpimanoidea'
- 'Mimetidion belongs to Theridiidae'
- 'Mimetus belongs to Mimetidae'
- 'Mimetus bituberculatus belongs to Mimetus'
- 'Mimeutychurus is a subjective synonym of Strotarchus'
- 'Mimeutychurus paradoxus is recombined as Strotarchus paradoxus'
- 'Minutunguis belongs to Nephilidae'
- 'Mioscorpio belongs to Scorpionidae'
- 'Miothomisus belongs to Thomisidae'
- 'Miraraneus belongs to Araneidae'
- 'Mirometa belongs to Araneidae'
- 'Mirometa valdespinosa belongs to Mirometa'
- 'Miropholcus is a nomen dubium'
- 'Miropholcus heteropus is a nomen dubium'
- 'Misionella belongs to Filistatidae'
- 'Misionella didicostae belongs to Misionella'
- 'Mistura belongs to Dysderidae'
- 'Mistura perplexa belongs to Mistura'
- 'Misumena belongs to Thomisidae'
- 'Misumena samlandica belongs to Misumena'
- 'Mitostoma belongs to Nemastomatidae'
- 'Miturgidae belongs to Dictynoidea'
- 'Mixonomata belongs to Oribatida'
- 'Mixopteridae belongs to Carcinosomatoidea'
- 'Mixopteroidea is a subjective synonym of Carcinosomatoidea'
- 'Mizagalla belongs to Dictynidae'
- 'Mizalia belongs to Oecobiidae'
- 'Mizalia globosa is replaced by Theridion berendti'
- 'Mizalia pilosula is a subjective synonym of Mizalia rostrata'
- 'Mizalia punctulata is recombined as Eomysmena punctulata'
- 'Mizalia rostrata belongs to Mizalia'
- 'Mizalia truncata is a nomen nudum'
- 'Mochloribatula belongs to Mochlozetidae'
- 'Mochlozetidae belongs to Oripodoidea'
- 'Modisimus belongs to Pholcidae'
- 'Modisimus calcar belongs to Modisimus'
- 'Modisimus calcaroides belongs to Modisimus'
- 'Modisimus crassifemoralis belongs to Modisimus'
- 'Modisimus oculatus belongs to Modisimus'
- 'Modisimus tuberosus belongs to Modisimus'
- 'Molinaranea belongs to Araneidae'
- 'Molinaranea mitnickii belongs to Molinaranea'
- 'Monoblemma belongs to Tetrablemmidae'
- 'Monoblemma spinosum belongs to Monoblemma'
- 'Monogynaspida belongs to Mesostigmata'
- 'Moselopteridae belongs to Moselopteroidea'
- 'Moselopteroidea belongs to Eurypterina'
- 'Mulvius is a subjective synonym of Scapheremaeus'
- 'Mulvius undosus is recombined as Scapheremaeus undosus'
- 'Municeps is a subjective synonym of Episinus'
- 'Municeps chiapasanus is recombined as Episinus chiapasanus'
- 'Municeps pulcher is recombined as Episinus pulcher'
- 'Myanlagonops belongs to Lagonomegopidae'
- 'Mycobatidae belongs to Ceratozetoidea'
- 'Mygalomorphae belongs to Opisthothelae'
- 'Myrmarachne belongs to Salticidae'
- 'Myrmecarchaea belongs to Archaeidae'
- 'Myrmecorinna belongs to Corinnidae'
- 'Myro belongs to Desidae'
- 'Eocryphoeca fossilis is a nomen dubium'
- 'Myro hirsutus belongs to Myro'
- 'Mysmena belongs to Mysmenidae'
- 'Mysmena dominicana belongs to Mysmena'
- 'Mysmena fossilis belongs to Mysmena'
- 'Mysmenidae belongs to Araneoidea'
- 'Mysmenopsis belongs to Mysmenidae'
- 'Mysmenopsis lissycoleyae belongs to Mysmenopsis'
- 'Mystagogus belongs to Linyphiidae'
- 'Mystagogus glaber belongs to Mystagogus'
- 'Nactodipoena was reranked as Lasaeola (Nactodipoena) and belongs to Lasaeola'
- 'Nactodipoena dunbari is recombined as Lasaeola (Nactodipoena) dunbari'
- 'Namurotarbus belongs to Trigonotarbida'
- 'Nanoctenus belongs to Ctenidae'
- 'Nanoctenus longipes belongs to Nanoctenus'
- 'Nanomysmena belongs to Theridiidae'
- 'Nanomysmena palanga belongs to Nanomysmena'
- 'Nanomysmena petrunkevitchi belongs to Nanomysmena'
- 'Nanomysmena pseudogracilis belongs to Nanomysmena'
- 'Nanorchestidae belongs to Alycoidea'
- 'Nanosteatoda belongs to Theridiidae'
- 'Nemastoma belongs to Nemastomatidae'
- 'Nemastoma clavigerum is recombined as Sabacon claviger'
- 'Nemastoma denticulatum is recombined as Mitostoma denticulatum'
- 'Nemastoma incertum belongs to Nemastoma'
- 'Nemastoma succineum is a subjective synonym of Mitostoma denticulatum'
- 'Nemastoma tuberculatum is recombined as Histricostoma tuberculatum'
- 'Nemastomatidae belongs to Troguloidea'
- 'Nemastomoides belongs to Nemastomoididae'
- 'Nemastomoides elaveris belongs to Nemastomoides'
- 'Nemastomoididae belongs to Troguloidea'
- 'Nemesiidae belongs to Mygalomorphae'
- 'Neoamblypygi belongs to Euamblypygi'
- 'Neobisiidae belongs to Neobisioidea'
- 'Neobisioidea belongs to Hemictenata'
- 'Neobisium belongs to Neobisiidae'
- 'Neoliodes belongs to Neoliodidae'
- 'Neoliodes dominicus belongs to Neoliodes'
- 'Neoliodes ensigerus is recombined as Platyliodes ensigerus'
- 'Neoliodes quadriscutatus belongs to Neoliodes'
- 'Neoliodidae belongs to Neoliodoidea'
- 'Neoliodoidea belongs to Brachypylina'
- 'Neon belongs to Salticidae'
- 'Nephila belongs to Nephilidae'
- 'Nephila pennatipes belongs to Nephila'
- 'Nephilinae was reranked as the family Nephilidae and belongs to Araneoidea'
- 'Neriene rubens belongs to Neriene' according to Blackwall 1833
- 'Neriene rubens is recombined as Gonatium rubens'
- 'Nesticidae belongs to Araneoidea'
- 'Nicoletiella was reranked as Labidostomma (Nicoletiella) and belongs to Labidostomma'
- 'Nops belongs to Caponiidae'
- 'Nops lobatus belongs to Nops'
- 'Nops segmentatus is a subjective synonym of Nops lobatus'
- 'Notaspis bipilis belongs to Notaspis' according to Hermann 1804
- 'Notaspis bipilis is recombined as Ceratoppia bipilis'
- 'Notaspis horridus is recombined as Camisia horrida'
- 'Nothridae belongs to Crotonioidea'
- 'Nothrina belongs to Desmonomata'
- 'Nothrus belongs to Nothridae'
- 'Nothrus kuehli is a subjective synonym of Camisia horrida'
- 'Nothrus punctulum belongs to Nothrus'
- 'Nothrus sulcatus is recombined as Plategeocranus sulcatus'
- 'Nyranytarbus belongs to Eophrynidae'
- 'Obisium rathkii is a subjective synonym of Pycnochelifer kleemanni'
- 'Obisium sieboldtii is recombined as Beierowithius sieboldtii'
- 'Obnisus is a subjective synonym of Custodela'
- 'Obnisus tenuipes is recombined as Custodela tenuipes'
- 'Obscurpholcomma belongs to Theridiidae'
- 'Ochyroceratidae belongs to Haplogynae'
- 'Ocululoborus belongs to Uloboridae'
- 'Ocypete is a subjective synonym of Heteropoda'
- 'Ocypete angustifrons is a nomen nudum'
- 'Ocypete crassipes is recombined as Eusparassus crassipes'
- 'Ocypete decumana is recombined as Sosybius decumana'
- 'Ocypete marginata is a nomen nudum'
- 'Ocypete triguttata is recombined as Ablator triguttatus'
- 'Oecobiidae belongs to Eresoidea'
- 'Oecobius belongs to Oecobiidae'
- 'Oecobius piliformis belongs to Oecobius'
- 'Oligochelifer is a subjective synonym of Dichela'
- 'Oligochelifer gracilis is recombined as Dichela gracilis'
- 'Oligochelifer granulatus is recombined as Dichela granulatus'
- 'Oligochelifer serratidentatus is recombined as Dichela serratidentatus'
- 'Oligochernes belongs to Chernetidae'
- 'Oligoleptoneta belongs to Leptonetidae'
- 'Ommatocepheus belongs to Cepheidae'
- 'Onca is a nomen nudum'
- 'Onca lepida is a nomen nudum'
- 'Onca pumila is a nomen nudum'
- 'Onychopterella belongs to Onychopterellidae'
- 'Onychopterellidae belongs to Onychopterelloidea'
- 'Onychopterelloidea belongs to Eurypterina'
- 'Onychothelyphonus belongs to Hubbardiidae'
- 'Oomartus is a subjective synonym of Anthracomartus'
- 'Oomartus nyranensis is recombined as Anthracomartus nyranensis'
- 'Oonopidae belongs to Dysderoidea'
- 'Oonops seldeni is recombined as Stenoonops seldeni'
- 'Ootarbus belongs to Architarbidae'
- 'Opellianus belongs to Uloboridae'
- 'Opilio belongs to Phalangiidae'
- 'Opilio corniger is a subjective synonym of Dicranopalpus ramiger'
- 'Opilio ramiger is recombined as Dicranopalpus ramiger'
- 'Opilioacarida was reranked as a suborder and belongs to Parasitiformes'
- 'Opilioacaridae belongs to Opilioacaroidea'
- 'Opilioacaroidea belongs to Opilioacarida'
- 'Opilioacarus belongs to Opilioacaridae'
- 'Opilioacarus aenigmus belongs to Opilioacarus'
- 'Opiliotarbidae belongs to Phalangiotarbida'
- 'Opiliotarbus belongs to Opiliotarbidae'
- 'Opiliotarbus kliveri is an objective synonym of Architarbus hoffmanni'
- 'Opisthophylax belongs to Araneae'
- 'Opisthophylax exarata belongs to Opisthophylax'
- 'Opisthothelae belongs to Araneae'
- 'Opopaea belongs to Oonopidae'
- 'Oppia belongs to Oppiidae'
- 'Oppiidae belongs to Oppioidea'
- 'Oppioidea belongs to Brachypylina'
- 'Oppites belongs to Oppiidae'
- 'Opsieobuthidae belongs to Paraisobuthoidea'
- 'Opsieobuthus belongs to Opsieobuthidae'
- 'Orbiculariae belongs to Araneoclada'
- 'Orchestina belongs to Oonopidae'
- 'Orchestina (Baltorchestina) belongs to Orchestina'
- 'Orchestina (Gallorchestina) belongs to Orchestina'
- 'Orchestina albertensis is recombined as Canadaorchestina albertensis'
- 'Orchestina baltica belongs to Orchestina'
- 'Orchestina breviembolus belongs to Orchestina'
- 'Orchestina cochlembolus is recombined as Orchestina (Baltorchestina) cochlembolus'
- 'Orchestina crassiembolus belongs to Orchestina'
- 'Orchestina crassipatellaris is recombined as Orchestina (Baltorchestina) crassipatellaris'
- 'Orchestina crassitibialis is recombined as Orchestina (Baltorchestina) crassitibialis'
- 'Orchestina dominicana belongs to Orchestina'
- 'Orchestina forceps belongs to Orchestina'
- 'Orchestina furca is recombined as Orchestina (Baltorchestina) furca'
- 'Orchestina gappi belongs to Orchestina'
- 'Orchestina imperialis is recombined as Orchestina (Baltorchestina) imperialis'
- 'Orchestina kenyana belongs to Orchestina'
- 'Orchestina longimana belongs to Orchestina'
- 'Orchestina mortua belongs to Orchestina'
- 'Orchestina parisiensis is recombined as Orchestina (Gallorchestina) parisiensis'
- 'Orchestina rabagensis belongs to Orchestina'
- 'Orchestina tibialis belongs to Orchestina'
- 'Orchestina tuberosa belongs to Orchestina'
- 'Oribatella belongs to Oribatellidae'
- 'Oribatellidae belongs to Oribatelloidea'
- 'Oribatelloidea belongs to Brachypylina'
- 'Oribates convexulus is recombined as Sphaerozetes convexulus'
- 'Oribates politus is a subjective synonym of Ceratoppia bipilis'
- 'Oribatida belongs to Sarcoptiformes'
- 'Oribatulidae belongs to Oripodoidea'
- 'Oribella cervicornu is recombined as Oppia cervicornu'
- 'Oribotritia belongs to Oribotritiidae'
- 'Oribotritiidae belongs to Euphthiracaroidea'
- 'Oripodidae belongs to Oripodoidea'
- 'Oripodoidea belongs to Brachypylina'
- 'Ornithodoros belongs to Argasidae'
- 'Ornithodoros antiquus belongs to Ornithodoros'
- 'Orthosterni was reranked as the suborder Orthosternina and belongs to Scorpiones'
- 'Orthotarbus belongs to Architarbidae'
- 'Orthotarbus longipes belongs to Orthotarbus'
- 'Otiothops belongs to Palpimanidae'
- 'Otocepheidae belongs to Carabodoidea'
- 'Oxyopes belongs to Oxyopidae'
- 'Oxyopes defectus belongs to Oxyopes'
- 'Oxyopidae belongs to Lycosoidea'
- 'Pachychernes belongs to Chernetidae'
- 'Pachychernes effossus belongs to Pachychernes'
- 'Pacullidae is a subjective synonym of Tetrablemmidae'
- 'Palaeoakentrobuthus belongs to Buthidae'
- 'Palaeoananteris belongs to Buthidae'
- 'Palaeoananteris ukrainensis belongs to Palaeoananteris'
- 'Palaeoanapis belongs to Anapidae'
- 'Palaeoblossia belongs to Daesiidae'
- 'Palaeoblossia groehni belongs to Palaeoblossia'
- 'Palaeoburmesebuthus belongs to Buthoidea'
- 'Palaeoburmesebuthus grimaldii belongs to Palaeoburmesebuthus'
- 'Palaeobuthidae belongs to Palaeobuthoidea'
- 'Palaeobuthoidea belongs to Meristosternina'
- 'Palaeobuthus belongs to Palaeobuthidae'
- 'Palaeobuthus distinctus belongs to Palaeobuthus'
- 'Palaeocharinidae belongs to Trigonotarbida'
- 'Palaeocharinoides is a subjective synonym of Palaeocharinus'
- 'Palaeocharinoides hornei is recombined as Palaeocharinus hornei'
- 'Palaeocharinus belongs to Palaeocharinidae'
- 'Palaeocteniza belongs to Trigonotarbida'
- 'Palaeodictyna belongs to Dictynidae'
- 'Palaeodictyna intermedia belongs to Palaeodictyna'
- 'Palaeodictyna longispina belongs to Palaeodictyna'
- 'Palaeodictyna singularis belongs to Palaeodictyna'
- 'Palaeodictyna spiculum belongs to Palaeodictyna'
- 'Palaeodictyna termitophila belongs to Palaeodictyna'
- 'Palaeodictyna unispina belongs to Palaeodictyna'
- 'Palaeodrassus belongs to Gnaphosidae'
- 'Palaeodrassus cockerelli belongs to Palaeodrassus'
- 'Palaeodrassus florissanti belongs to Palaeodrassus'
- 'Palaeoepeirotypus belongs to Theridiosomatidae'
- 'Palaeoero was reranked as Ero (Palaeoero) and belongs to Ero'
- 'Palaeoeuscorpiidae belongs to Chactoidea'
- 'Palaeoeuscorpius belongs to Palaeoeuscorpiidae'
- 'Palaeogrosphus belongs to Buthidae'
- 'Palaeohygropoda belongs to Praeterleptonetidae'
- 'Palaeohygropoda myanmarensis belongs to Palaeohygropoda'
- 'Palaeoisometrus belongs to Buthidae'
- 'Palaeolathys belongs to Dictynidae'
- 'Palaeolathys circumductus belongs to Palaeolathys'
- 'Palaeolathys quadruplex belongs to Palaeolathys'
- 'Palaeolathys similis belongs to Palaeolathys'
- 'Palaeolathys spinosa belongs to Palaeolathys'
- 'Palaeoleptoneta belongs to Leptonetidae'
- 'Palaeolinyphia is a subjective synonym of Selenyphantes'
- 'Palaeolinyphia flagellifera belongs to Palaeolinyphia' according to Wunderlich 1986
- 'Palaeolinyphia flagellifera is recombined as Selenyphantes flagellifera'
- 'Palaeolychas belongs to Buthidae'
- 'Palaeomachus belongs to Scorpiones'
- 'Palaeomarachne granulata belongs to Palaeomarachne' according to Rudkin et al. 2013
- 'Palaeometa belongs to Tetragnathidae'
- 'Palaeomiagrammopes belongs to Uloboridae'
- 'Palaeomicromenneus belongs to Deinopidae'
- 'Palaeomicromenneus lebanensis belongs to Palaeomicromenneus'
- 'Palaeomysmena belongs to Mysmenidae'
- 'Palaeonephila belongs to Nephilidae'
- 'Palaeopachygnatha belongs to Tetragnathidae'
- 'Palaeopachygnatha cockerelli belongs to Palaeopachygnatha'
- 'Palaeopachygnatha scudderi belongs to Palaeopachygnatha'
- 'Palaeoperenethis belongs to Pisauridae'
- 'Palaeoperenethis thaleri belongs to Palaeoperenethis'
- 'Palaeophonidae belongs to Palaeophonoidea'
- 'Palaeophonoidea belongs to Lobosternina'
- 'Palaeophonus belongs to Palaeophonidae'
- 'Palaeophonus caledonicus is recombined as Allopalaeophonus caledonicus'
- 'Palaeophonus hunteri is an objective synonym of Allopalaeophonus caledonicus'
- 'Palaeophonus lightbodyi belongs to Palaeophonus'
- 'Palaeophonus loudonensis is recombined as Dolichophonus loudonensis'
- 'Palaeophonus nuncius belongs to Palaeophonus'
- 'Palaeophonus osborni is recombined as Proscorpius osborni'
- 'Palaeopisthacanthidae belongs to Scorpionoidea'
- 'Palaeopisthacanthus belongs to Palaeopisthacanthidae'
- 'Palaeopisthacanthus schucherti belongs to Palaeopisthacanthus'
- 'Palaeopisthacanthus vogelandurdeni belongs to Palaeopisthacanthus'
- 'Palaeoplectreurys belongs to Plectreuridae'
- 'Palaeoprotobuthus belongs to Buthidae'
- 'Palaeoricinulei belongs to Ricinulei'
- 'Palaeoscorpiidae is corrected as Palaeoscorpionidae and belongs to Palaeoscorpoidea'
- 'Palaeoscorpioidea is corrected as Palaeoscorpoidea and belongs to Holosternina'
- 'Palaeoscorpius belongs to Palaeoscorpionidae'
- 'Palaeoscorpius devonicus belongs to Palaeoscorpius'
- 'Palaeosegestria belongs to Segestriidae'
- 'Palaeosegestria lutzzii belongs to Palaeosegestria'
- 'Palaeosiro belongs to Stylocellidae'
- 'Palaeosomata belongs to Oribatida'
- 'Palaeospinisoma belongs to Liocranidae'
- 'Palaeospinobuthus belongs to Buthidae'
- 'Palaeotarbus belongs to Trigonotarbida'
- 'Palaeothea devonica belongs to Palaeothea' according to Bergstroem et al. 1980
- 'Palaeothele belongs to Mesothelae'
- 'Palaeotityobuthus belongs to Buthidae'
- 'Palaeotydeus belongs to Tydeidae'
- 'Palaeouloborus belongs to Uloboridae'
- 'Palaeouloborus lacasae belongs to Palaeouloborus'
- 'Palaeoxysticus belongs to Thomisidae'
- 'Palaeoxysticus extinctus belongs to Palaeoxysticus'
- 'Palaranea belongs to Arthromygalidae'
- 'Palaranea borassifoliae belongs to Palaranea'
- 'Paleoamblypygi belongs to Amblypygi'
- 'Paleokoenenia belongs to Palpigradi'
- 'Palpigradi belongs to Arachnida'
- 'Palpimanidae belongs to Palpimanoidea'
- 'Palpimanoidea belongs to Entelegynae'
- 'Palpiraptor belongs to Corinnidae'
- 'Panctenata belongs to Iocheirata'
- 'Paracarcinosoma is a subjective synonym of Eusarcana'
- 'Paracarus belongs to Opilioacaridae'
- 'Paracarus pristinus belongs to Paracarus'
- 'Paracharontidae belongs to Paleoamblypygi'
- 'Parahughmilleria belongs to Adelophthalmidae'
- 'Paraisobuthidae belongs to Paraisobuthoidea'
- 'Paraisobuthoidea belongs to Lobosternina'
- 'Paraisobuthus belongs to Paraisobuthidae'
- 'Paraisobuthus duobicarinatus belongs to Paraisobuthus'
- 'Paraisobuthus frici belongs to Paraisobuthus'
- 'Paraisobuthus prantli belongs to Paraisobuthus'
- 'Paraisobuthus virginiae belongs to Paraisobuthus'
- 'Paralabulla belongs to Linyphiidae'
- 'Paralinus belongs to Salticidae'
- 'Paralinus crosbyi belongs to Paralinus'
- 'Paralycosa belongs to Araneae'
- 'Paramegistidae belongs to Paramegistoidea'
- 'Paramegistoidea belongs to Antennophorina'
- 'Paramiagrammopes belongs to Uloboridae'
- 'Parapimodus belongs to Oripodidae'
- 'Paraprotacarus belongs to Tydeidae'
- 'Pararainbowia belongs to Erythraeoidea'
- 'Pararainbowia martilli belongs to Pararainbowia'
- 'Parasitengona belongs to Anystides'
- 'Parasitiae belongs to Gamasina'
- 'Parasitidae belongs to Parasitoidea'
- 'Parasitiformes was reranked as a order and belongs to Acari'
- 'Parasitoidea belongs to Parasitiae'
- 'Paraspermophora belongs to Pholcidae'
- 'Parastylonuridae belongs to Stylonuroidea'
- 'Parastylonurus belongs to Parastylonuridae'
- 'Paratarbus belongs to Architarbidae'
- 'Paratemnoides belongs to Atemnidae'
- 'Parattidae belongs to Lycosoidea'
- 'Parattus belongs to Parattidae'
- 'Parattus evocatus belongs to Parattus'
- 'Parattus latitatus belongs to Parattus'
- 'Parattus oculatus belongs to Parattus'
- 'Parattus resurrectus belongs to Parattus'
- 'Pardosa belongs to Lycosidae'
- 'Pareobuthidae belongs to Isobuthoidea'
- 'Pareobuthus belongs to Pareobuthidae'
- 'Pareobuthus salopiensis belongs to Pareobuthus'
- 'Parevophrys is a subjective synonym of Hyllus'
- 'Parevophrys succini is recombined as Hyllus succini'
- 'Parhypochthonioidea belongs to Parhyposomata'
- 'Parhyposomata belongs to Oribatida'
- 'Paruroctea is a subjective synonym of Mizalia'
- 'Paruroctea blauvelti is recombined as Mizalia blauvelti'
- 'Parvomygale belongs to Microstigmatidae'
- 'Parvulus belongs to Thomisidae'
- 'Patarchaea belongs to Archaeidae'
- 'Patarchaea muralis belongs to Patarchaea'
- 'Pellobunus belongs to Samoidae'
- 'Peloppiidae belongs to Gustavioidea'
- 'Pelops is replaced by Eupelops'
- 'Pensacolatus belongs to Salticidae'
- 'Pensacolatus coxalis belongs to Pensacolatus'
- 'Pensacolatus spinipes belongs to Pensacolatus'
- 'Pentapalaeopycnon inconspicua belongs to Pentapalaeopycnon' according to Hedgpeth 1978
- 'Penthaleus tristiculus is recombined as Penthalodes tristiculus'
- 'Penthalodes belongs to Penthalodidae'
- 'Penthalodidae belongs to Eupodoidea'
- 'Pentlandopterus belongs to Eurypteroidea'
- 'Mesophonus maculatus is a nomen dubium'
- 'Perneria is a subjective synonym of Anthracomartus'
- 'Perturbator is a nomen dubium'
- 'Perturbator corniger is a nomen dubium'
- 'Petaloscorpio belongs to Gigantoscorpionidae'
- 'Petaloscorpio bureaui belongs to Petaloscorpio'
- 'Petaloscorpionidae is a subjective synonym of Gigantoscorpionidae'
- 'Petrovicia belongs to Eophrynidae'
- 'Petrovicia proditoria belongs to Petrovicia'
- 'Petrunkevitchiana belongs to Phalangioidea'
- 'Phalangioidea belongs to Eupnoi'
- 'Phalangiotarbi was reranked as the order Phalangiotarbida and belongs to Arachnida'
- 'Phalangiotarbidae is a subjective synonym of Architarbidae'
- 'Phalangiotarbus belongs to Architarbidae'
- 'Phalangita is corrected as Phalangiidae and belongs to Phalangioidea'
- 'Phalangium lacoei is recombined as Amauropilio lacoei'
- 'Phalangium oculatum is recombined as Petrunkevitchiana oculata'
- 'Phalangium succineum is a nomen dubium'
- 'Phalangopus is a nomen dubium'
- 'Phalangopus subtiles belongs to Phalangopus' according to Menge 1854
- 'Phalangopus subtilis is a nomen dubium'
- 'Phenopelopidae belongs to Phenopelopoidea'
- 'Phenopelopoidea belongs to Brachypylina'
- 'Phidippus belongs to Salticidae'
- 'Phidippus fasciatus is recombined as Gorgopsina fasciata'
- 'Phidippus formosus is recombined as Gorgopsina formosa'
- 'Phidippus frenatus is recombined as Gorgopsina frenata'
- 'Phidippus gibberulus is recombined as Euophrys gibberula'
- 'Phidippus impressus belongs to Phidippus'
- 'Phidippus melanocephalus is recombined as Gorgopsina melanocephala'
- 'Phidippus paululus is recombined as Gorgopsina paulula'
- 'Phidippus pusillus belongs to Phidippus'
- 'Philacarus belongs to Laniatores'
- 'Philodromidae belongs to Gnaphosoidea'
- 'Philodromus dubius is a subjective synonym of Gnaphosa affinis'
- 'Philodromus griseus is a nomen nudum'
- 'Philodromus microcephalus is a subjective synonym of Ablator triguttatus'
- 'Philodromus redrogradus is a nomen nudum'
- 'Philodromus reptans is a nomen nudum'
- 'Philodromus spinimanus is recombined as Apostenus spinimanus'
- 'Philodromus squamiger is a subjective synonym of Ablator triguttatus'
- 'Phlegrata belongs to Salticidae'
- 'Phlegrata pala belongs to Phlegrata'
- 'Pholcidae belongs to Haplogynae'
- 'Pholcochyrocer belongs to Pholcochyroceridae'
- 'Pholcochyrocer guttulaeque belongs to Pholcochyrocer'
- 'Pholcochyrocerini was reranked as the family Pholcochyroceridae and belongs to Haplogynae'
- 'Pholcophora belongs to Pholcidae'
- 'Pholcophora brevipes belongs to Pholcophora'
- 'Pholcophora gracilis belongs to Pholcophora'
- 'Pholcophora longicornis belongs to Pholcophora'
- 'Phoroncidia belongs to Theridiidae'
- 'Phoxiscorpio belongs to Centromachidae'
- 'Phoxiscorpio peachi belongs to Phoxiscorpio'
- 'Phoxiscorpionidae is a subjective synonym of Centromachidae'
- 'Phrurolithus belongs to Corinnidae'
- 'Phrynidae belongs to Phrynoidea'
- 'Phrynoidea belongs to Neoamblypygi'
- 'Phrynomartus is a subjective synonym of Aphantomartus'
- 'Phrynus belongs to Phrynidae'
- 'Phrynus fossilis belongs to Phrynus' according to Keferstein 1834
- 'Phrynus fossilis is a nomen dubium'
- 'Phrynus marioni is a subjective synonym of Phrynus fossilis'
- 'Phthiracaridae belongs to Phthiracaroidea'
- 'Phthiracaroidea belongs to Eupyctima'
- 'Phthiracarus belongs to Phthiracaridae'
- 'Phthiracarus pyropus is recombined as Oribotritia pyropus'
- 'Piankhi belongs to Ischyropsalidoidea'
- 'Pimoa belongs to Pimoidae'
- 'Pimoidae belongs to Araneoidea'
- 'Pirata belongs to Lycosidae'
- 'Pisauridae belongs to Lycosoidea'
- 'Pittsfordipterus belongs to Adelophthalmidae'
- 'Planomartus belongs to Eophrynidae'
- 'Planoxyopes belongs to Oxyopidae'
- 'Planoxyopes eximius belongs to Planoxyopes'
- 'Plategeocranus belongs to Archaeorchestidae'
- 'Plateremaeoidea belongs to Brachypylina'
- 'Platnickina belongs to Theridiidae'
- 'Platybunus dentipalpus is recombined as Caddo dentipalpus'
- 'Platyliodes belongs to Neoliodidae'
- 'Plectreuridae belongs to Haplogynae'
- 'Plectreurys belongs to Plectreuridae'
- 'Plectreurys pittfieldi belongs to Plectreurys'
- 'Pleomartidae is a subjective synonym of Anthracomartidae'
- 'Pleomartus is a subjective synonym of Anthracomartus'
- 'Pleophrynidae is a subjective synonym of Eophrynidae'
- 'Pleophrynus belongs to Eophrynidae'
- 'Plesiosiro belongs to Plesiosironidae'
- 'Plesiosiro madeleyi belongs to Plesiosiro'
- 'Plesiosironidae belongs to Haptopoda'
- 'Pleurolycosa is a nomen vanum'
- 'Plumorsolidae belongs to Dysderoidea'
- 'Plumorsolus belongs to Plumorsolidae'
- 'Pocadicnemis belongs to Linyphiidae'
- 'Pocononia belongs to Eophrynidae'
- 'Poliochera belongs to Poliocheridae'
- 'Poliochera punctulata belongs to Poliochera'
- 'Poliochera pustulatus is a nomen dubium'
- 'Poliocheridae belongs to Palaeoricinulei'
- 'Polyochera glabra is recombined as Poliochera glabra'
- 'Polystomurum stormeri belongs to Polystomurum' according to Novojilov 1958
- 'Praearcturidae belongs to Spongiophonoidea'
- 'Praearcturus belongs to Praearcturidae'
- 'Praearcturus gigas belongs to Praearcturus'
- 'Praeoarces is a nomen dubium'
- 'Praeoarces exitus is a nomen dubium'
- 'Praetereuryopis belongs to Theridiidae'
- 'Praeterleptoneta belongs to Praeterleptonetidae'
- 'Praeterleptoneta spinipes belongs to Praeterleptoneta'
- 'Praeterleptonetidae belongs to Haplogynae'
- 'Praetheridiini was reranked as the family Praetheridiidae and belongs to Araneoidea'
- 'Praetheridion belongs to Praetheridiidae'
- 'Pringlia is a subjective synonym of Liomesaspis'
- 'Pringlia fritschi is a subjective synonym of Liomesaspis laevis'
- 'Priscometa belongs to Tetragnathidae'
- 'Priscotama is a subjective synonym of Prototama'
- 'Priscotama antiqua is recombined as Prototama antiqua'
- 'Prodidomidae belongs to Gnaphosoidea'
- 'Prodidomus belongs to Prodidomidae'
- 'Prodysdera belongs to Araneae'
- 'Prodysdera intermedia belongs to Prodysdera'
- 'Progonatemnus belongs to Atemnidae'
- 'Proholoscotolemon belongs to Cladonychidae'
- 'Prolinus belongs to Salticidae'
- 'Promygale is a subjective synonym of Anthracomartus'
- 'Promygale elegans is recombined as Anthracomartus elegans'
- 'Promygale janae is recombined as Anthracomartus janae'
- 'Promygale rotundata is a subjective synonym of Anthracomartus carcinoides'
- 'Promygalidae is a subjective synonym of Anthracomartidae'
- 'Pronepos belongs to Theridiidae'
- 'Pronepos exilis belongs to Pronepos'
- 'Pronepos fossilis belongs to Pronepos'
- 'Propago belongs to Zodariidae'
- 'Propago debilis belongs to Propago'
- 'Propetes is replaced by Eyukselus'
- 'Eyukselus argutus is a nomen nudum'
- 'Eyukselus felinus is a nomen nudum'
- 'Eyukselus griseus is a nomen nudum'
- 'Eyukselus latifrons is a nomen nudum'
- 'Eyukselus pumilus is a nomen nudum'
- 'Proscorpionidae is corrected as Proscorpiidae and belongs to Scorpiones'
- 'Proscorpius belongs to Proscorpiidae'
- 'Prosocer belongs to Clubionidae'
- 'Prosocer mollis belongs to Prosocer'
- 'Prosomapoda belongs to Xiphosura'
- 'Prostigmata was reranked as a infraorder and belongs to Trombidiformes'
- 'Protacarus belongs to Alycidae'
- 'Prothelyphonus belongs to Uropygi'
- 'Prothelyphonus cordai is a subjective synonym of Prothelyphonus bohemicus'
- 'Protheridiidae belongs to Araneoidea'
- 'Protheridion belongs to Protheridiidae'
- 'Prothoplophoridae belongs to Prothoplophoroidea'
- 'Prothoplophoroidea belongs to Enarthronota'
- 'Protoarrenurus belongs to Arrenuroidea'
- 'Protobuthidae belongs to Buthoidea'
- 'Protobuthus belongs to Protobuthidae'
- 'Protobuthus elegans belongs to Protobuthus'
- 'Protochersis belongs to Araneae'
- 'Protochersis spinosus belongs to Protochersis'
- 'Protochthoniidae belongs to Enarthronota'
- 'Protocteniza belongs to Arthromygalidae'
- 'Protohahnia belongs to Hahniidae'
- 'Protoischnuridae is a subjective synonym of Hemiscorpiidae'
- 'Protoischnurus belongs to Hemiscorpiidae'
- 'Protoischnurus axelrodorum belongs to Protoischnurus'
- 'Protolachesis belongs to Araneae'
- 'Protolachesis annulata belongs to Protolachesis'
- 'Protolycosa belongs to Arthromygalidae'
- 'Protolycosa is replaced by Paralycosa'
- 'Protolycosa anthracophila belongs to Protolycosa'
- 'Protolycosa attiformis is recombined as Paralycosa attiformis'
- 'Protolycosa cebennensis belongs to Protolycosa'
- 'Protomastigusa belongs to Dictynidae'
- 'Protomimetus belongs to Mimetidae'
- 'Protoorthobula belongs to Corinnidae'
- 'Protophrynus is replaced by Sorellophrynus'
- 'Protophrynus carbonarius is recombined as Sorellophrynus carbonarius'
- 'Protophysoglenes belongs to Synotaxidae'
- 'Protopilio is a subjective synonym of Nemastomoides'
- 'Protopilio depressus is a nomen dubium'
- 'Protopilio longipes is recombined as Nemastomoides longipes'
- 'Protosolpuga belongs to Solifugae'
- 'Protosolpuga carbonaria belongs to Protosolpuga'
- 'Protospeleorchestes belongs to Nanorchestidae'
- 'Protosteatoda belongs to Theridiidae'
- 'Prototama belongs to Hersiliidae'
- 'Prototama succinea belongs to Prototama'
- 'Psalistops belongs to Barychelidae'
- 'Psalistops hispaniolensis belongs to Psalistops'
- 'Pseudarchaeoctonus belongs to Proscorpiidae'
- 'Pseudarchaeoctonus denticulatus belongs to Pseudarchaeoctonus'
- 'Pseudoacrometa belongs to Synotaxidae'
- 'Pseudobuthiscorpius is a subjective synonym of Compsoscorpius'
- 'Pseudobuthiscorpius labiosus is a subjective synonym of Compsoscorpius buthiformis'
- 'Pseudochiridiidae belongs to Cheiridioidea'
- 'Pseudochiridium belongs to Pseudochiridiidae'
- 'Pseudochthonius belongs to Chthoniidae'
- 'Pseudochthonius squamosus belongs to Pseudochthonius'
- 'Pseudoeophrynus is a subjective synonym of Stenotrogulus'
- 'Pseudogarypidae belongs to Feaelloidea'
- 'Pseudogarypus belongs to Pseudogarypidae'
- 'Pseudokreischeria belongs to Kreischeriidae'
- 'Pseudopachygnathus belongs to Trombidiae'
- 'Pseudopachygnathus maculatus belongs to Pseudopachygnathus'
- 'Pseudoprotacarus belongs to Alicorhagiidae'
- 'Pseudosparianthis belongs to Sparassidae'
- 'Pseudoteutana belongs to Theridiidae'
- 'Pseudothomisus belongs to Araneae'
- 'Pseudothomisus articulatus belongs to Pseudothomisus'
- 'Psiloderces belongs to Ochyroceratidae'
- 'Pterygotidae belongs to Pterygotioidea'
- 'Pterygotoidea is corrected as Pterygotioidea and belongs to Diploperculata'
- 'Pterygotus belongs to Pterygotidae'
- 'Pterygotus (Acutiramus) floweri is recombined as Acutiramus floweri'
- 'Pterygotus (Pterygotus) is an invalid subgroup of Pterygotus'
- 'Pterygotus (Pterygotus) waylandsmithi is recombined as Erettopterus waylandsmithi'
- 'Pulmonoscorpius belongs to Centromachidae'
- 'Pulmonoscorpius kirktonensis belongs to Pulmonoscorpius'
- 'Pumiliopimoa belongs to Pumiliopimoidae'
- 'Pumiliopimoidae belongs to Araneoidea'
- 'Punctoribates belongs to Mycobatidae'
- 'Pycnochelifer belongs to Cheliferidae'
- 'Pycnogonites uncinatus belongs to Pycnogonites' according to Quenstedt 1852
- 'Pycnosinga belongs to Araneidae'
- 'Pycnotarbus belongs to Architarbidae'
- 'Pycnothelidae is a subjective synonym of Nemesiidae'
- 'Pyemotes belongs to Pyemotidae'
- 'Pyemotes primus belongs to Pyemotes'
- 'Pyemotidae belongs to Pyemotoidea'
- 'Pyemotoidea belongs to Heterostigmatina'
- 'Pyritaranea belongs to Pyritaraneidae'
- 'Pyritaranea tubifera belongs to Pyritaranea'
- 'Pyritaraneidae belongs to Mesothelae'
- 'Pythonissa is a subjective synonym of Gnaphosa'
- 'Pythonissa affinis is recombined as Gnaphosa affinis'
- 'Pythonissa ambigua is recombined as Gnaphosa ambigua'
- 'Pythonissa bipunctata is a nomen nudum'
- 'Pythonissa discophora is a nomen nudum'
- 'Pythonissa glabra is a nomen nudum'
- 'Pythonissa sericata is recombined as Cryptoplanus sericatus'
- 'Pythonissa villosa is a nomen nudum'
- 'Quamtana belongs to Pholcidae'
- 'Quamtana huberi belongs to Quamtana'
- 'Rakovnicia belongs to Arthromygalidae'
- 'Rakovnicia antiqua belongs to Rakovnicia'
- 'Raphignathina belongs to Eleutherengonides'
- 'Raphignathoidea belongs to Eleutherengonides'
- 'Resinacaridae belongs to Pyemotoidea'
- 'Retina is a subjective synonym of Heteropoda'
- 'Retina robusta is recombined as Heteropoda robusta'
- 'Rhagidiidae belongs to Eupodoidea'
- 'Rhyncholophus foveolatus is recombined as Erythraeus foveolatus'
- 'Rhyncholophus illustris is recombined as Balaustium illustris'
- 'Rhyncholophus incertus is recombined as Erythraeus incertus'
- 'Rhyncholophus longipes is recombined as Erythraeus longipes'
- 'Roncus belongs to Neobisiidae'
- 'Rosamygale belongs to Hexathelidae'
- 'Rosamygale grauvogeli belongs to Rosamygale'
- 'Rowlandius belongs to Hubbardiidae'
- 'Ruedemannipterus belongs to Dolichopteridae'
- 'Ruganapis belongs to Anapidae'
- 'Rugapholcomma belongs to Theridiidae'
- 'Sabacon belongs to Sabaconidae'
- 'Sabacon bachofeni is a subjective synonym of Sabacon claviger'
- 'Sabaconidae belongs to Ischyropsalidoidea'
- 'Saetosoma belongs to Tetrablemmidae'
- 'Salticidae belongs to Gnaphosoidea'
- 'Salticoididae belongs to Entelegynae'
- 'Salticoididus belongs to Salticoididae'
- 'Salticus reticulatus belongs to Salticus' according to Blackwall 1853
- 'Salticus reticulatus is recombined as Neon reticulatus'
- 'Samlandicmeta belongs to Tetragnathidae'
- 'Samoidae belongs to Samoidea'
- 'Samoidea belongs to Grassatores'
- 'Sanctacaris uncata belongs to Sanctacaris' according to Briggs and Collins 1988
- 'Sarcoptiformes belongs to Acariformes'
- 'Sarinda belongs to Salticidae'
- 'Savignia belongs to Linyphiidae'
- 'Savignia frontata belongs to Savignia' according to Blackwall 1833
- 'Savignia frontata belongs to Savignia'
- 'Saxonanapis belongs to Anapidae'
- 'Saxonarchaea belongs to Archaeidae'
- 'Scapheremaeus belongs to Cymbaeremaeidae'
- 'Scapheremaeus brevitarsus is recombined as Neoliodes brevitarsus'
- 'Schellenbergia belongs to Araneae'
- 'Schellenbergia rotundata belongs to Schellenbergia'
- 'Scheloribates belongs to Scheloribatidae'
- 'Scheloribatidae belongs to Oripodoidea'
- 'Schizomida belongs to Arachnida'
- 'Schizotetranychus belongs to Tetranychidae'
- 'Schneidarachne belongs to Haplocnemata'
- 'Sclerosomatidae belongs to Phalangioidea'
- 'Scoloposcorpio belongs to Scoloposcorpionidae'
- 'Scoloposcorpio cramondensis belongs to Scoloposcorpio'
- 'Scoloposcorpionidae belongs to Paraisobuthoidea'
- 'Scopoides belongs to Gnaphosidae'
- 'Scopulyna belongs to Dictynidae'
- 'Scorpio schweiggeri is a nomen dubium'
- 'Scorpio zeuneri is recombined as Mioscorpio zeuneri'
- 'Scorpionides is corrected as Scorpionidae and belongs to Scorpionoidea'
- 'Scorpionoidea belongs to Orthosternina'
- 'Scudderia is replaced by Kustaria'
- 'Scudderia carbonaria is recombined as Kustaria carbonaria'
- 'Scutoribates belongs to Unduloribatidae'
- 'Scytodes belongs to Scytodidae'
- 'Scytodes piliformis belongs to Scytodes'
- 'Scytodes planithorax belongs to Scytodes'
- 'Scytodes stridulans belongs to Scytodes'
- 'Scytodidae belongs to Haplogynae'
- 'Segestria belongs to Segestriidae'
- 'Segestria cristata belongs to Segestria'
- 'Segestria cylindrica is a subjective synonym of Adorator hispidus'
- 'Segestria elongata is a nomen dubium'
- 'Segestria exarata is a nomen nudum'
- 'Segestria nana is a nomen dubium'
- 'Segestria plicata belongs to Segestria'
- 'Segestria pusilla is recombined as Orchestina pusilla'
- 'Segestria scudderi belongs to Segestria'
- 'Segestria secessa belongs to Segestria'
- 'Segestria succinei belongs to Segestria'
- 'Segestria tomentosa belongs to Segestria'
- 'Segestria undulata is a nomen nudum'
- 'Segestriidae belongs to Dysderoidea'
- 'Sejida belongs to Mesostigmata'
- 'Sejidae belongs to Sejoidea'
- 'Sejoidea belongs to Sejida'
- 'Sejus belongs to Sejidae'
- 'Sejus bdelloides belongs to Sejus'
- 'Selenopidae belongs to Gnaphosoidea'
- 'Selenops belongs to Selenopidae'
- 'Selenops beynai belongs to Selenops'
- 'Selenyphantes belongs to Linyphiidae'
- 'Sellnickiella belongs to Labidostommatidae'
- 'Sellnickiella balticae belongs to Sellnickiella'
- 'Serratochorus belongs to Pholcidae'
- 'Serratochorus pygmaeus belongs to Serratochorus'
- 'Sicariidae belongs to Haplogynae'
- 'Siga is a nomen nudum'
- 'Siga crinita is a nomen nudum'
- 'Sinaranea belongs to Palpimanoidea'
- 'Sinaranea metaxyostraca belongs to Sinaranea'
- 'Sinodictyna belongs to Dictynoidea'
- 'Sinoscorpius belongs to Scorpionidae'
- 'Sinoscorpius shandongense is corrected as Sinoscorpius shandongensis and belongs to Sinoscorpius'
- 'Siro belongs to Sironidae'
- 'Sironidae belongs to Cyphophthalmi'
- 'Slimonia belongs to Slimonidae'
- 'Slimonia dubia belongs to Slimonia'
- 'Slimonidae belongs to Pterygotioidea'
- 'Somaspidion belongs to Eophrynidae'
- 'Somaspidion hammapheron belongs to Somaspidion'
- 'Sorellophrynus belongs to Paleoamblypygi'
- 'Sosybius belongs to Trochanteriidae'
- 'Sosybius major belongs to Sosybius'
- 'Sosybius minor belongs to Sosybius'
- 'Sparassidae belongs to Gnaphosoidea'
- 'Spatiator belongs to Spatiatoridae'
- 'Spatiator praeceps belongs to Spatiator'
- 'Spatiatoridae belongs to Palpimanoidea'
- 'Sphaerozetes belongs to Ceratozetidae'
- 'Spheconia is a nomen nudum'
- 'Spheconia brevipes is a nomen nudum'
- 'Spinilipus belongs to Cyatholipidae'
- 'Spinisinus belongs to Theridiidae'
- 'Spinitharinus belongs to Theridiidae'
- 'Spinitheridiosoma belongs to Theridiosomatidae'
- 'Spinizodarion belongs to Zodariidae'
- 'Spinocharinus belongs to Palaeocharinidae'
- 'Spintharus belongs to Theridiidae'
- 'Spongiophonidae belongs to Spongiophonoidea'
- 'Spongiophonoidea belongs to Holosternina'
- 'Spongiophonus belongs to Spongiophonidae'
- 'Spongiophonus pustulosus belongs to Spongiophonus'
- 'Steatoda belongs to Theridiidae'
- 'Stemmops belongs to Theridiidae'
- 'Steneattus belongs to Salticidae'
- 'Stenoonops belongs to Oonopidae'
- 'Stenoscorpio belongs to Stenoscorpionidae'
- 'Stenoscorpionidae belongs to Acanthoscorpionoidea'
- 'Stenotrogulus belongs to Eophrynidae'
- 'Stephanobunus belongs to Phalangiidae'
- 'Sternophoridae belongs to Sternophoroidea'
- 'Sternophoroidea belongs to Panctenata'
- 'Stigmaeidae belongs to Raphignathoidea'
- 'Stoermeropterus belongs to Moselopteridae'
- 'Stoermeroscorpio is a subjective synonym of Proscorpius'
- 'Stoermeroscorpio delicatus is a subjective synonym of Proscorpius osborni'
- 'Stoermeroscorpioniidae is a subjective synonym of Proscorpiidae'
- 'Stoermeroscorpionoidea is an invalid subgroup of Holosternina'
- 'Strieremaeus belongs to Archaeorchestidae'
- 'Strieremaeus illibatus belongs to Strieremaeus'
- 'Strotarchus belongs to Miturgidae'
- 'Strotarchus heidti belongs to Strotarchus'
- 'Stylocellidae belongs to Cyphophthalmi'
- 'Stylonuracea is an invalid subgroup of Eurypterida'
- 'Stylonuridae belongs to Stylonuroidea'
- 'Stylonurina belongs to Eurypterida'
- 'Stylonuroidea belongs to Stylonurina'
- 'Stylonurus conicus belongs to Stylonurus' according to Laurie 1892
- 'Stylonurus conicus is recombined as Stoermeropterus conicus'
- 'Stylonurus elegans is recombined as Laurieipterus elegans'
- 'Stylonurus macrophthalmus is recombined as Hardieopterus macrophthalmus'
- 'Stylonurus ornatus is recombined as Parastylonurus ornatus'
- 'Stylonurus ruedemanni is recombined as Kiaeropterus ruedemanni' according to Waterston 1979
- 'Styposis belongs to Theridiidae'
- 'Succinaenigma belongs to Thomisidae'
- 'Succinero was reranked as Ero (Succinero) and belongs to Ero'
- 'Succineta belongs to Linyphiidae'
- 'Succinilipus belongs to Cyatholipidae'
- 'Succiniraptor belongs to Thomisidae'
- 'Succiniropsis belongs to Zoropsidae'
- 'Succinitaxus belongs to Synotaxidae'
- 'Succinobertus belongs to Theridiidae'
- 'Succinomidae belongs to Lycosoidea'
- 'Succinomus belongs to Succinomidae'
- 'Succinura belongs to Theridiidae'
- 'Succinyna belongs to Dictynidae'
- 'Succinyna longembolus belongs to Succinyna'
- 'Succinyna pulcher belongs to Succinyna'
- 'Succinyna spinipalpus belongs to Succinyna'
- 'Succiphantes belongs to Linyphiidae'
- 'Sulcosynotaxus belongs to Synotaxidae'
- 'Synaphridae belongs to Araneoidea'
- 'Synema belongs to Thomisidae'
- 'Synema enigmaticum belongs to Synema'
- 'Synotaxidae belongs to Araneoidea'
- 'Syphax belongs to Thomisidae'
- 'Syphax asper belongs to Syphax'
- 'Syphax crassipes belongs to Syphax'
- 'Syphax fuliginosus belongs to Syphax'
- 'Syphax gracilis belongs to Syphax'
- 'Syphax hirtus is a nomen nudum'
- 'Syphax megacephalus belongs to Syphax'
- 'Syphax radiatus is recombined as Succiniraptor radiatus'
- 'Syphax thoracicus belongs to Syphax'
- 'Systariella belongs to Clubionoidea'
- 'Tama maior is recombined as Prototama maior'
- 'Tama media is recombined as Prototama media'
- 'Tama minor is recombined as Prototama minor'
- 'Tanaupodidae belongs to Tanaupodoidea'
- 'Tanaupodoidea belongs to Trombidiae'
- 'Tarantula is replaced by Phrynus'
- 'Tarantula resinae is recombined as Phrynus resinae'
- 'Tectocymba belongs to Cymbaeremaeidae'
- 'Tegenaria belongs to Agelenidae'
- 'Tegenaria gracilipes is recombined as Eocryphoeca gracilipes'
- 'Tegenaria lacazei belongs to Tegenaria'
- 'Tegenaria obscura is a nomen dubium'
- 'Tegenaria virilis belongs to Tegenaria'
- 'Tegeocranus is a subjective synonym of Cepheus'
- 'Tegeocranus implicatus is recombined as Cepheus implicatus'
- 'Telema belongs to Telemidae'
- 'Telemidae belongs to Haplogynae'
- 'Telmatoscorpio belongs to Telmatoscorpionidae'
- 'Telmatoscorpio brevipectus belongs to Telmatoscorpio'
- 'Telmatoscorpionidae belongs to Paraisobuthoidea'
- 'Tentabuna pfeifferi is recombined as Pseudosparianthis pfeifferi'
- 'Termes buchi is a nomen dubium'
- 'Anthracomartus hageni is a nomen dubium'
- 'Testudinaria is replaced by Testudinaroides'
- 'Testudinaria papposa is recombined as Testudinaroides papposa'
- 'Testudinaroides belongs to Araneidae'
- 'Tethneus belongs to Araneidae'
- 'Tethneus guyoti belongs to Tethneus'
- 'Tethneus hentzii is corrected as Tethneus hentzi and belongs to Tethneus'
- 'Tethneus obduratus belongs to Tethneus'
- 'Tethneus provectus belongs to Tethneus'
- 'Tethneus robustus belongs to Tethneus'
- 'Tethneus twenhofeli belongs to Tethneus'
- 'Tetrablemmidae belongs to Haplogynae'
- 'Tetragnatha belongs to Tetragnathidae'
- 'Tetragnatha tertiaria belongs to Tetragnatha'
- 'Tetragnathinae was reranked as the family Tetragnathidae and belongs to Araneoidea'
- 'Tetranychidae belongs to Tetranychoidea'
- 'Tetranychoidea belongs to Raphignathina'
- 'Tetranychus brevipes is recombined as Schizotetranychus brevipes'
- 'Tetranychus gibbus is recombined as Metatetranychus gibbus'
- 'Teudis ligula is recombined as Lupettiana ligula'
- 'Textrix funesta is recombined as Clythia funesta'
- 'Textrix lineata is recombined as Captrix lineata'
- 'Thallumetus belongs to Dictynidae'
- 'Thelyphonidae belongs to Uropygi'
- 'Thelyphonus bohemicus is recombined as Prothelyphonus bohemicus'
- 'Thelyphrynus belongs to Paleoamblypygi'
- 'Thelyphrynus elongatus belongs to Thelyphrynus'
- 'Theraphosidae belongs to Mygalomorphae'
- 'Therea is replaced by Thereola'
- 'Therea hispida is recombined as Adorator hispidus'
- 'Therea petiolata is recombined as Thereola petiolata'
- 'Therea pubescens is recombined as Thereola pubescens'
- 'Thereola belongs to Trochanteriidae'
- 'Theridiidae belongs to Araneoidea'
- 'Theridiometa is a subjective synonym of Acrometa'
- 'Theridiometa edwardsi is a subjective synonym of Acrometa cristata'
- 'Theridiometa robusta is recombined as Acrometa robusta'
- 'Theridiometa samlandica is recombined as Acrometa samlandica'
- 'Theridion belongs to Theridiidae'
- 'Theridion annulipes belongs to Theridion'
- 'Theridion berendti belongs to Theridion'
- 'Theridion contrarium belongs to Theridion'
- 'Theridion crassipalpum belongs to Theridion'
- 'Theridion erectoides belongs to Theridion'
- 'Theridion erectum belongs to Theridion'
- 'Theridion globulus belongs to Theridion'
- 'Theridion inversum belongs to Theridion'
- 'Theridion maculipes belongs to Theridion'
- 'Theridion ovale is replaced by Theridion wunderlichi'
- 'Theridion variosoma belongs to Theridion'
- 'Theridion wunderlichi belongs to Theridion' according to Penney 2001
- 'Theridion wunderlichi belongs to Theridion'
- 'Theridiosoma belongs to Theridiosomatidae'
- 'Theridiosomatidae belongs to Araneoidea'
- 'Theridium alutaceum is recombined as Theridion alutaceum'
- 'Theridium bucklandi is recombined as Theridion bucklandi'
- 'Theridium detersum is recombined as Theridion detersum'
- 'Theridium granulatum is recombined as Clya granulata'
- 'Theridium hirtum is recombined as Theridion hirtum'
- 'Theridium opertaneum is recombined as Palaeometa opertanea'
- 'Theridium ovale is recombined as Theridion ovale'
- 'Theridium ovatum is recombined as Theridion ovatum'
- 'Theridium seclusum is recombined as Linyphia seclusa'
- 'Theridium simplex is recombined as Theridion simplex'
- 'Thiodina belongs to Salticidae'
- 'Thiodina beugelorum belongs to Thiodina'
- 'Thomisidae belongs to Gnaphosoidea'
- 'Thomisiraptor belongs to Thomisidae'
- 'Thomisus belongs to Thomisidae'
- 'Thomisus defossus belongs to Thomisus'
- 'Thomisus disjunctus belongs to Thomisus'
- 'Thomisus lividus belongs to Thomisus'
- 'Thomisus matutinus is a nomen nudum'
- 'Thomisus oeningensis is recombined as Xysticus oeningensis'
- 'Thomisus resutus belongs to Thomisus'
- 'Thomisus sulzeri belongs to Thomisus'
- 'Thurandina waterstoni belongs to Thurandina' according to Stoermer 1974
- 'Thyelia belongs to Theridiidae'
- 'Thyelia anomala belongs to Thyelia'
- 'Thyelia convexa belongs to Thyelia'
- 'Thyelia fossula belongs to Thyelia'
- 'Thyelia marginata belongs to Thyelia'
- 'Thyelia pallida belongs to Thyelia'
- 'Thyelia pectinata is a nomen nudum'
- 'Thyelia scotina belongs to Thyelia'
- 'Thyelia spinosa is a nomen nudum'
- 'Thyelia tristis belongs to Thyelia'
- 'Thyelia villosa belongs to Thyelia'
- 'Timeropus belongs to Araneae'
- 'Tiphoscorpio is a subjective synonym of Eoarthropleura'
- 'Tiphoscorpio hueberi is a nomen dubium'
- 'Tiphoscorpionidae is a subjective synonym of Arthropleuridae'
- 'Tiphoscorpionoidea is an invalid subgroup of Myriapoda'
- 'Titanoeca hesterna is recombined as Palaeodrassus hesternus'
- 'Titanoeca ingenua is recombined as Palaeodrassus ingenuus'
- 'Titanoecidae belongs to Dictynoidea'
- 'Titanoscorpio belongs to Scorpiones'
- 'Titanoscorpio douglassi belongs to Titanoscorpio'
- 'Tityus belongs to Buthidae'
- 'Tityus ambarensis is recombined as Microtityus ambarensis'
- 'Tityus eogenus belongs to Tityus'
- 'Toschia belongs to Linyphiidae'
- 'Trachelas belongs to Corinnidae'
- 'Trachelas poinari belongs to Trachelas'
- 'Trachychelifer belongs to Cheliferidae'
- 'Trachyscorpio belongs to Eoscorpiidae'
- 'Trachyscorpio squarrosus belongs to Trachyscorpio'
- 'Travunioidea belongs to Insidiatores'
- 'Trechaleidae belongs to Lycosoidea'
- 'Trhypochthoniidae belongs to Crotonioidea'
- 'Trhypochthonius belongs to Trhypochthoniidae'
- 'Triangulotarbus belongs to Architarbidae'
- 'Triassaraneus belongs to Araneomorphae'
- 'Triassaraneus andersonorum belongs to Triassaraneus'
- 'Tridenchthoniidae belongs to Chthonioidea'
- 'Trigonomartidae is a subjective synonym of Aphantomartidae'
- 'Trigonomartus is a subjective synonym of Aphantomartus'
- 'Trigonomartus dorlodoti is a subjective synonym of Aphantomartus areolatus'
- 'Trigonomartus whitei is recombined as Pocononia whitei'
- 'Trigonoscorpio is a subjective synonym of Eoscorpius'
- 'Trigonoscorpio americanus is a subjective synonym of Eoscorpius carbonarius'
- 'Trigonotarbidae belongs to Trigonotarbida'
- 'Trigonotarbus belongs to Trigonotarbidae'
- 'Trigonotarbus carbonarius is recombined as Lissomartus carbonarius'
- 'Trigonotarbus johnsoni belongs to Trigonotarbus'
- 'Trigonotarbus schucherti is recombined as Lissomartus schucherti'
- 'Trigynaspida belongs to Mesostigmata'
- 'Trochanteridromulus belongs to Trochanteriidae'
- 'Trochanteridromus belongs to Trochanteriidae'
- 'Trochanteriidae belongs to Gnaphosoidea'
- 'Trochosa belongs to Lycosidae'
- 'Trochosa terricola belongs to Trochosa' according to Thorell 1856
- 'Trochosa terricola belongs to Trochosa'
- 'Trogulidae belongs to Troguloidea'
- 'Troguloidea belongs to Dyspnoi'
- 'Trogulus belongs to Trogulidae'
- 'Trombidiae belongs to Parasitengona'
- 'Trombidiformes belongs to Acariformes'
- 'Trombidiidae belongs to Trombidioidea'
- 'Trombidioidea belongs to Trombidiae'
- 'Trombidium clavipes is recombined as Allothrombium clavipes'
- 'Trombidium saccatum is recombined as Erythraeus saccatus'
- 'Truncatiramus is a subjective synonym of Erettopterus'
- 'Tuberanapis belongs to Anapidae'
- 'Tydeidae belongs to Tydeoidea'
- 'Tydeoidea belongs to Eupodides'
- 'Typhlopisthacanthus is a subjective synonym of Compsoscorpius'
- 'Typhlopisthacanthus anglicus is a subjective synonym of Compsoscorpius buthiformis'
- 'Typhloscorpius is a subjective synonym of Eoscorpius'
- 'Typhloscorpius distinctus is recombined as Eoscorpius distinctus'
- 'Tyroglyphites belongs to Acaridae'
- 'Ulesanis belongs to Theridiidae'
- 'Ulobomopes belongs to Uloboridae'
- 'Uloboridae belongs to Deinopoidea'
- 'Umerosoma belongs to Theridiosomatidae'
- 'Ummidia belongs to Ctenizidae'
- 'Ummidia damzeni belongs to Ummidia'
- 'Ummidia malinowskii belongs to Ummidia'
- 'Unduloribatidae belongs to Phenopelopoidea'
- 'Unispinatoda belongs to Theridiidae'
- 'Uroctea belongs to Oecobiidae'
- 'Uroctea galloprovincialis belongs to Uroctea'
- 'Urodinychidae belongs to Uropodoidea'
- 'Uroobovella belongs to Urodinychidae'
- 'Uropodiae belongs to Uropodina'
- 'Uropodina belongs to Monogynaspida'
- 'Uropodoidea belongs to Uropodiae'
- 'Vectaraneus belongs to Cybaeidae'
- 'Vectaraneus yulei belongs to Vectaraneus'
- 'Venustulus waukeshaensis belongs to Venustulus' according to Moore 2005
- 'Veterator belongs to Trochanteriidae'
- 'Veterator angustus belongs to Veterator'
- 'Veterator ascutum belongs to Veterator'
- 'Veterator extinctus belongs to Veterator'
- 'Veterator incompletus belongs to Veterator'
- 'Veterator longipes belongs to Veterator'
- 'Veterator loricatus belongs to Veterator'
- 'Veterator porrectus belongs to Veterator'
- 'Veterator viduus belongs to Veterator'
- 'Vetsegestria belongs to Segestriidae'
- 'Vicipholcomma belongs to Theridiidae'
- 'Viocurus is a subjective synonym of Acrometa'
- 'Viocurus fossilis is a subjective synonym of Acrometa cristata'
- 'Vratislavia belongs to Anthracosironidae'
- 'Waeringopteroidea belongs to Eurypterina'
- 'Waeringopterus belongs to Waeringopteroidea'
- 'Waeringoscorpio belongs to Proscorpiidae'
- 'Waeringoscorpionidae is a subjective synonym of Proscorpiidae'
- 'Walckenaeria obscura belongs to Walckenaeria' according to Blackwall 1834
- 'Walckenaeria obscura is recombined as Cnephalocotes obscurus'
- 'Walckenaeria pumila belongs to Walckenaeria' according to Blackwall 1841
- 'Walckenaeria pumila is recombined as Pocadicnemis pumila'
- 'Waterstonia belongs to Waterstoniidae'
- 'Waterstonia aidriensis belongs to Waterstonia'
- 'Waterstonia brachistodactyla belongs to Waterstonia'
- 'Waterstoniidae belongs to Loboarchaeoctonoidea'
- 'Wattisonia belongs to Scorpiones'
- 'Wattisonia coseleyensis belongs to Wattisonia'
- 'Weinbergina opitzi belongs to Weinbergina' according to Richter and Richter 1929
- 'Willsiscorpio belongs to Willsiscorpionidae'
- 'Willsiscorpionidae belongs to Mesophonoidea'
- 'Withiidae belongs to Cheliferoidea'
- 'Withius belongs to Withiidae'
- 'Woodwardopteridae is a subjective synonym of Mycteropidae'
- 'Wulfila belongs to Anyphaenidae'
- 'Wulfila spinipes belongs to Wulfila'
- 'Xenillus belongs to Liacaridae'
- 'Xysticus belongs to Thomisidae'
- 'Xysticus annulipes belongs to Xysticus'
- 'Zachria belongs to Sparassidae'
- 'Zachria desiderabilis belongs to Zachria'
- 'Zamilia belongs to Oecobiidae'
- 'Zarqagonomegops belongs to Lagonomegopidae'
- 'Zarqaraneus belongs to Protheridiidae'
- 'Zelotes belongs to Gnaphosidae'
- 'Zelotetis belongs to Gnaphosidae'
- 'Zerconidae belongs to Zerconoidea'
- 'Zerconoidea belongs to Epicriiae'
- 'Zetorchestoidea belongs to Brachypylina'
- 'Zilla belongs to Araneidae'
- 'Zilla cornumana is a nomen nudum'
- 'Zilla gracilis belongs to Zilla'
- 'Zilla porrecta belongs to Zilla'
- 'Zilla spinipalpa is a nomen nudum'
- 'Zilla veterana belongs to Zilla'
- 'Zodariidae belongs to Clubionoidea'
- 'Zodariodamus belongs to Zodariidae'
- 'Zorapostenus belongs to Zoridae'
- 'Zoridae belongs to Lycosoidea'
- 'Zoropsidae belongs to Lycosoidea'