Opinions from D. S. Jordan 1963
- 'Abyssocottidae belongs to Cottiformes'
- 'Acanthaspis belongs to Psammosteidae'
- 'Acanthias belongs to Squalidae'
- 'Acanthidium belongs to Squalidae'
- 'Acanthobatis belongs to Rajidae'
- 'Acanthoclinidae belongs to Kurtiformes'
- 'Acanthodei belongs to Selachii'
- 'Acanthodes belongs to Acanthoessidae'
- 'Acanthodopsis belongs to Acanthoessidae'
- 'Acanthoessidae belongs to Acanthodei'
- 'Acanthoessus belongs to Acanthoessidae'
- 'Acanthopleurus belongs to Xenacanthidae'
- 'Acanthopterygii belongs to Ostariophysi'
- 'Acanthorhinus belongs to Squalidae'
- 'Acanthuridae belongs to Acanthuriformes'
- 'Acanthuriformes was reranked as a unranked clade and belongs to Squamipennes'
- 'Accipenseridae belongs to Glaniostomi'
- 'Aceratiidae belongs to Pediculati'
- 'Achiridae belongs to Heterosomata'
- 'Acmoniodus belongs to Ptyctodontidae'
- 'Acondylacanthus belongs to Orodontidae'
- 'Acrodobatis belongs to Ginglystomidae'
- 'Acrodonchus belongs to Heterodontidae'
- 'Acrodus belongs to Heterodontidae'
- 'Acropomatidae belongs to Kurtiformes'
- 'Acrotidae belongs to Icosteiformes'
- 'Actinistia belongs to Crossopterygii'
- 'Actinobatis belongs to Rajidae'
- 'Actinopteri belongs to Pisces'
- 'Adiapneustes belongs to Orodontidae'
- 'Adrianichthyidae belongs to Cyprinodontes'
- 'Aellopos belongs to Rhinobatidae'
- 'Aetobatus belongs to Myliobatidae'
- 'Aetomylaeus belongs to Myliobatidae'
- 'Aetoplatea belongs to Myliobatidae'
- 'Aganacanthus belongs to Janassidae'
- 'Aganodus belongs to Xenacanthidae'
- 'Agassichthys belongs to Coccosteidae'
- 'Agassizodus belongs to Heterodontidae'
- 'Ageleodus belongs to Janassidae'
- 'Agnathomyzon belongs to Petromyzonidae'
- 'Agonidae belongs to Cottiformes'
- 'Alabidae belongs to Alabiformes'
- 'Alabiformes belongs to Symbranchia'
- 'Albulidae belongs to Albuloidei'
- 'Albuloidei belongs to Isospondyli'
- 'Alepocephalidae belongs to Clupeoidei'
- 'Allotriognathi belongs to Ostariophysi'
- 'Alopecias belongs to Alopiidae'
- 'Alopiidae belongs to Lamnoidei'
- 'Alopiopsis belongs to Galeidae'
- 'Amacanthus belongs to Heterodontidae'
- 'Ambassidae belongs to Kurtiformes'
- 'Amblycipitidae belongs to Nematognathii'
- 'Amblyopsidae belongs to Cyprinodontes'
- 'Amblypristis belongs to Pristidae'
- 'Amblyraja belongs to Rajidae'
- 'Ameiuridae belongs to Nematognathii'
- 'Amiidae belongs to Halecomorphi'
- 'Ammodytidae belongs to Ammodytiformes'
- 'Ammodytiformes belongs to Jugulares'
- 'Amphacanthi belongs to Percomorphi'
- 'Amphiliidae belongs to Nematognathii'
- 'Amphioxi belongs to Leptocardii'
- 'Amphioxides belongs to Amphioxididae'
- 'Amphioxididae belongs to Amphioxi'
- 'Amphioxus belongs to Branchiostomidae'
- 'Amphipnoidae belongs to Holostomi'
- 'Amphistiidae belongs to Capriformes'
- 'Amphotistius belongs to Dasyatidae'
- 'Anabantidae belongs to Labyrinthici'
- 'Anablepidae belongs to Cyprinodontes'
- 'Anacanthini belongs to Ostariophysi'
- 'Anacanthus belongs to Dasyatidae'
- 'Analithis belongs to Platyrhinidae'
- 'Anarhichadidae belongs to Blenniiformes'
- 'Anarrhichthyidae belongs to Blenniiformes'
- 'Ancistrodon is replaced by Grypodon'
- 'Ancylostylidae belongs to Clupeoidei'
- 'Anguillavidae belongs to Archencheli'
- 'Anguillidae belongs to Anguilloidei'
- 'Anguilloidei was reranked as a unranked clade and belongs to Enchelycephali'
- 'Anodontacanthus belongs to Xenacanthidae'
- 'Anomalichthys belongs to Coccosteidae'
- 'Anomalopidae belongs to Berycoidei'
- 'Anoplopomidae belongs to Hexagrammiformes'
- 'Anopsus belongs to Myxinidae'
- 'Anostomidae belongs to Heterognathi'
- 'Anotopteridae belongs to Enchodontoidei'
- 'Antacanthus belongs to Janassidae'
- 'Anteliochimaera belongs to Chimaeroidei'
- 'Antennariidae belongs to Pediculati'
- 'Antigoniidae belongs to Capriformes'
- 'Antliodus belongs to Janassidae'
- 'Aphareidae belongs to Kurtiformes'
- 'Aphredoderidae belongs to Xenarchi'
- 'Apidosiidae belongs to Eventognathi'
- 'Aploactidae belongs to Scorpaeniformes'
- 'Aplochitonidae belongs to Salmonoidei'
- 'Aplodactylidae belongs to Cirrhitoidei'
- 'Apodes belongs to Teleosti'
- 'Apodometes belongs to Psammodontidae'
- 'Apogonidae belongs to Kurtiformes'
- 'Apolectidae belongs to Carangiformes'
- 'Aprionodon belongs to Galeidae'
- 'Apristurus belongs to Scylliorhinidae'
- 'Apteronotidae belongs to Gymnonoti'
- 'Apterurus belongs to Mobulidae'
- 'Arapaimidae belongs to Osteoglossoidea'
- 'Archaeacanthus belongs to Onchidae'
- 'Archaeobatis belongs to Psammodontidae'
- 'Archaeomaenidae belongs to Halecomorphi'
- 'Archaeoteuthis belongs to Pteraspidae'
- 'Archencheli belongs to Apodes'
- 'Argentinidae belongs to Salmonoidei'
- 'Argidae belongs to Nematognathii'
- 'Arhynchobatis belongs to Platyrhinidae'
- 'Ariidae belongs to Nematognathii'
- 'Arpagodus belongs to Heterodontidae'
- 'Arripidae belongs to Kurtiformes'
- 'Arthropteridae belongs to Sarcura'
- 'Arthropterus belongs to Arthropteridae'
- 'Ascelichthyidae belongs to Cottiformes'
- 'Asineopidae belongs to Xenarchi'
- 'Aspidichthys belongs to Coccosteidae'
- 'Aspidodus belongs to Cochliodontidae'
- 'Aspidophoroididae belongs to Cottiformes'
- 'Aspidophorus belongs to Coccosteidae'
- 'Aspidorhynchidae belongs to Ginglymodi'
- 'Asteracanthus belongs to Heterodontidae'
- 'Asterodermidae belongs to Sarcura'
- 'Asterodermus belongs to Asterodermidae'
- 'Asterodontidae belongs to Chondrostei'
- 'Asteroplax belongs to Coccosteidae'
- 'Asteroptychius belongs to Orodontidae'
- 'Asterosteidae belongs to Stegophthalami'
- 'Asterosteus belongs to Asterosteidae'
- 'Astrabodus belongs to Psammodontidae'
- 'Astrape belongs to Torpedinidae'
- 'Astraspididae [misspelled as Astraspidae] belongs to Heterostraci'
- 'Astraspis belongs to Astraspidae'
- 'Astronesthidae belongs to Enchodontoidei'
- 'Asymmetron belongs to Epigonichthyidae'
- 'Atelaxia belongs to Allotriognathi'
- 'Ateleopodidae belongs to Chondrichthyes'
- 'Atherinidae belongs to Percesoces'
- 'Atopoclinidae belongs to Blenniiformes'
- 'Atractophorus belongs to Squalidae'
- 'Aulopidae belongs to Iniomi'
- 'Aulorhynchidae belongs to Hemibranchii'
- 'Aulostomi belongs to Acanthopterygii'
- 'Bagridae belongs to Nematognathii'
- 'Balistidae belongs to Sclerodermi'
- 'Banjosidae belongs to Kurtiformes'
- 'Batacanthus belongs to Janassidae'
- 'Bathycheilodus belongs to Cladodontidae'
- 'Bathyclupeidae belongs to Carangiformes'
- 'Bathydraconidae belongs to Nototheniiformes'
- 'Bathylagidae belongs to Salmonoidei'
- 'Bathymasteridae belongs to Bathymasteriformes'
- 'Bathymasteriformes belongs to Jugulares'
- 'Bathymyzon belongs to Petromyzonidae'
- 'Bathypteroidae belongs to Iniomi'
- 'Batis belongs to Rajidae'
- 'Batoidei belongs to Elasmobranchii'
- 'Batrachoididae belongs to Haplodoci'
- 'Bdellodus belongs to Heterodontidae'
- 'Bdellostoma belongs to Eptatretidae'
- 'Bedotiidae belongs to Percesoces'
- 'Belemnobatis belongs to Asterodermidae'
- 'Belonidae belongs to Synentognathi'
- 'Belonorhynchidae belongs to Chondrostei'
- 'Bengalichthys belongs to Torpedinidae'
- 'Benthobatis belongs to Torpedinidae'
- 'Berycidae belongs to Berycoidei'
- 'Berycoidei belongs to Acanthopterygii'
- 'Bleekeriidae belongs to Ammodytiformes'
- 'Blenniidae belongs to Blenniiformes'
- 'Blenniiformes was reranked as a unranked clade and belongs to Jugulares'
- 'Blepsiidae belongs to Cottiformes'
- 'Blochiidae belongs to Xiphiiformes'
- 'Borborodes belongs to Scymnorhinidae'
- 'Boreogaleus belongs to Galeidae'
- 'Bothidae belongs to Heterosomata'
- 'Bovictidae belongs to Nototheniiformes'
- 'Brachaelurus belongs to Orectolobidae'
- 'Brachionichthyidae belongs to Pediculati'
- 'Brachioptera belongs to Brachiopteridae'
- 'Brachiopteridae belongs to Masticura'
- 'Brachioptilon belongs to Mobulidae'
- 'Brachyacanthus belongs to Diplacanthidae'
- 'Brachydirus belongs to Coccosteidae'
- 'Brachygnathus belongs to Dinichthyidae'
- 'Bramidae belongs to Bramiformes'
- 'Bramiformes belongs to Percomorphi'
- 'Branchiostegidae belongs to Kurtiformes'
- 'Branchiostoma belongs to Branchiostomidae'
- 'Branchiostomidae belongs to Amphioxi'
- 'Bregmacerotidae belongs to Anacanthini'
- 'Brontichthys belongs to Dinichthyidae'
- 'Brotuliformes belongs to Jugulares'
- 'Bunocephalidae belongs to Nematognathii'
- 'Byssacanthus belongs to Acanthoessidae'
- 'Bythiacanthus belongs to Heterodontidae'
- 'Calamoichthyidae belongs to Cladistia'
- 'Callichthyidae belongs to Nematognathii'
- 'Callionymidae belongs to Callionymiformes'
- 'Callionymiformes belongs to Jugulares'
- 'Callipterygidae belongs to Trachiniformes'
- 'Calliscyllium belongs to Galeidae'
- 'Callopristodus belongs to Janassidae'
- 'Callorhinchidae is corrected as Callorhynchidae and belongs to Chimaeroidei'
- 'Callorhynchus belongs to Callorhynchidae'
- 'Calopodus belongs to Janassidae'
- 'Campodus belongs to Orodontidae'
- 'Campyloprion belongs to Edestidae'
- 'Caninoa belongs to Pentanchidae'
- 'Caninotus belongs to Pentanchidae'
- 'Canthigasteridae belongs to Gymnodontes'
- 'Cantioscyllium belongs to Scylliorhinidae'
- 'Capriformes belongs to Trichodontiformes'
- 'Caproidae belongs to Capriformes'
- 'Caracanthidae belongs to Scorpaeniformes'
- 'Caragola belongs to Geotriidae'
- 'Carangidae belongs to Carangiformes'
- 'Carangiformes was reranked as a unranked clade and belongs to Rhegnopteri'
- 'Carapiformes belongs to Jugulares'
- 'Carcharhinus belongs to Galeidae'
- 'Carcharias belongs to Carchariidae'
- 'Carcharias (Prionodon) was reranked as Prionodon and belongs to Galeidae'
- 'Carchariidae belongs to Lamnoidei'
- 'Carcharocles belongs to Lamnidae'
- 'Carcharodon belongs to Lamnidae'
- 'Carcharoides belongs to Galeidae'
- 'Carcharopsis belongs to Janassidae'
- 'Carencheli belongs to Apodes'
- 'Caristiidae belongs to Berycoidei'
- 'Caspiomyzon belongs to Petromyzonidae'
- 'Cataphracti belongs to Acanthopterygii'
- 'Catostomidae belongs to Eventognathi'
- 'Catulus belongs to Scylliorhinidae'
- 'Caulophrynidae belongs to Pediculati'
- 'Cebidichthyidae belongs to Blenniiformes'
- 'Centracion belongs to Heterodontidae'
- 'Centrarchidae belongs to Kurtiformes'
- 'Centrina belongs to Oxynotidae'
- 'Centriscidae belongs to Aulostomi'
- 'Centrodus belongs to Heterodontidae'
- 'Centrolophidae belongs to Stromateiformes'
- 'Centrophoroides belongs to Squalidae'
- 'Centrophorus belongs to Squalidae'
- 'Centropomidae belongs to Kurtiformes'
- 'Centroscyllium belongs to Squalidae'
- 'Centroscymnus belongs to Squalidae'
- 'Centroselachus belongs to Squalidae'
- 'Cephaleutherus belongs to Rajidae'
- 'Cephalopterus belongs to Mobulidae'
- 'Cephaloscyllium belongs to Scylliorhinidae'
- 'Cepolidae belongs to Kurtiformes'
- 'Ceraspidae belongs to Heterostraci'
- 'Ceraspis belongs to Ceraspidae'
- 'Ceratiidae belongs to Pediculati'
- 'Ceratobatis belongs to Mobulidae'
- 'Ceratoptera belongs to Mobulidae'
- 'Cerdalidae belongs to Zoarciformes'
- 'Cestracion belongs to Heterodontidae'
- 'Cestraciontes belongs to Selachii'
- 'Cestrorhinus belongs to Sphyrnidae'
- 'Cetomimidae belongs to Cetunculi'
- 'Cetopsidae belongs to Nematognathii'
- 'Cetorhinidae belongs to Lamnoidei'
- 'Cetorhinus belongs to Alopiidae'
- 'Cetunculi belongs to Iniomi'
- 'Chacidae belongs to Nematognathii'
- 'Chaenogaleus belongs to Galeidae'
- 'Chaenopsidae belongs to Blenniiformes'
- 'Chaetodontidae belongs to Chaetodontiformes'
- 'Chaetodontiformes belongs to Squamipennes'
- 'Chalazacanthus belongs to Heterodontidae'
- 'Champsodontidae belongs to Uranoscopiformes'
- 'Chanidae belongs to Clupeoidei'
- 'Channichthyidae belongs to Nototheniiformes'
- 'Characinidae belongs to Heterognathi'
- 'Characodontidae belongs to Cyprinodontes'
- 'Characodus belongs to Psammodontidae'
- 'Chaudhuriidae belongs to Opisthomi'
- 'Chauliodontidae belongs to Enchodontoidei'
- 'Chaunacidae belongs to Pediculati'
- 'Cheilodactylidae belongs to Cirrhitoidei'
- 'Cheiracanthus belongs to Acanthoessidae'
- 'Cheirothricidae belongs to Iniomi'
- 'Chelonichthyidae belongs to Temnothoraci'
- 'Chelonichthys belongs to Chelonichthyidae'
- 'Chelyophorus belongs to Coccosteidae'
- 'Chiasmodontidae belongs to Uranoscopiformes'
- 'Chiastodus belongs to Heterodontidae'
- 'Chiastolepis belongs to Pteraspidae'
- 'Chilodus belongs to Cladodontidae'
- 'Chilopterus belongs to Geotriidae'
- 'Chiloscyllium belongs to Hemiscylliidae'
- 'Chimaera belongs to Chimaeridae'
- 'Chimaeridae belongs to Chimaeroidei'
- 'Chimaeroidei belongs to Holocephali'
- 'Chimarrhichthyidae belongs to Percophidiformes'
- 'Chirocentridae belongs to Clupeoidei'
- 'Chironemidae belongs to Cirrhitoidei'
- 'Chitonodus belongs to Cochliodontidae'
- 'Chlamydoselachidae belongs to Selachophidichthyoidei'
- 'Chlamydoselachus belongs to Chlamydoselachidae'
- 'Chlorophthalmidae belongs to Iniomi'
- 'Cholodus belongs to Janassidae'
- 'Chomatodus belongs to Cochliodontidae'
- 'Chondrenchelyidae belongs to Ichthyotomi'
- 'Chondrenchelys belongs to Chondrenchelyidae'
- 'Chondrichthyes belongs to Iniomi'
- 'Chondrostei was reranked as a order and belongs to Ganoidei'
- 'Chondrosteidae belongs to Chondrostei'
- 'Chromides belongs to Teleostei'
- 'Cichlidae belongs to Chromides'
- 'Cirrhigaleus belongs to Scymnorhinidae'
- 'Cirrhitidae belongs to Cirrhitoidei'
- 'Cirrhitoidei belongs to Labyrinthici'
- 'Cirrhoscyllium belongs to Hemiscylliidae'
- 'Cirriscyllium belongs to Orectolobidae'
- 'Citharinidae belongs to Heterognathi'
- 'Cladistia belongs to Crossopterygii'
- 'Cladodontidae belongs to Ichthyotomi'
- 'Cladodus belongs to Cladodontidae'
- 'Cladoselache belongs to Cladoselachidae'
- 'Cladoselachidae belongs to Pleuropterygii'
- 'Clariidae belongs to Nematognathii'
- 'Climatius belongs to Diplacanthidae'
- 'Climaxodus belongs to Janassidae'
- 'Clinidae belongs to Blenniiformes'
- 'Clupeidae belongs to Clupeoidei'
- 'Clupeoidei belongs to Isospondyli'
- 'Clupisudidae belongs to Osteoglossoidea'
- 'Cobitidae belongs to Eventognathi'
- 'Coccosteidae belongs to Arthrothoraci'
- 'Coccosteus belongs to Coccosteidae'
- 'Cochliodontidae belongs to Janassides'
- 'Cochliodus belongs to Cochliodontidae'
- 'Coelacanthidae belongs to Actinistia'
- 'Coelolepis belongs to Thelodontidae'
- 'Colocephali belongs to Apodes'
- 'Comephoridae belongs to Cottiformes'
- 'Compsacanthus belongs to Xenacanthidae'
- 'Congiopodidae belongs to Scorpaeniformes'
- 'Congridae belongs to Congroidei'
- 'Congrogadidae belongs to Zoarciformes'
- 'Congroidei was reranked as a unranked clade and belongs to Enchelycephali'
- 'Copanognathus belongs to Dinichthyidae'
- 'Copodus belongs to Psammodontidae'
- 'Corax belongs to Lamnidae'
- 'Coregonidae belongs to Salmonoidei'
- 'Coridae belongs to Pharyngognathi'
- 'Coryphaenidae belongs to Coryphaeniformes'
- 'Coryphaeniformes belongs to Percomorphi'
- 'Cottidae belongs to Cottiformes'
- 'Cottiformes belongs to Cataphracti'
- 'Cottocomerphoridae belongs to Cottiformes'
- 'Cranodus belongs to Cochliodontidae'
- 'Creediidae belongs to Percophidiformes'
- 'Cromeriidae belongs to Clupeoidei'
- 'Crossognathidae belongs to Haplomi'
- 'Crossopterygidae was reranked as the subclass Crossopterygii and belongs to Pisces'
- 'Crossorhinus belongs to Orectolobidae'
- 'Cryptacanthodidae belongs to Blenniiformes'
- 'Ctenacanthus belongs to Heterodontidae'
- 'Ctenodipterini was reranked as a order and belongs to Dipneusta'
- 'Ctenodontidae belongs to Sirenoidei'
- 'Ctenopetalus belongs to Janassidae'
- 'Ctenoptychius belongs to Janassidae'
- 'Ctenothrissidae belongs to Berycoidei'
- 'Curtodus belongs to Heterodontidae'
- 'Cyathaspis belongs to Pteraspidae'
- 'Cyclarthrus belongs to Rhinobatidae'
- 'Cyclonarce belongs to Torpedinidae'
- 'Cyclopteridae belongs to Cyclopteriformes'
- 'Cyclopteriformes belongs to Cataphracti'
- 'Cyemidae belongs to Congroidei'
- 'Cymatodus belongs to Janassidae'
- 'Cymocephalus belongs to Galeidae'
- 'Cynias belongs to Galeidae'
- 'Cynoglossidae belongs to Heterosomata'
- 'Cynopodius belongs to Edestidae'
- 'Cyprinidae belongs to Eventognathi'
- 'Cyprinodontes belongs to Ostariophysi'
- 'Cyprinodontidae belongs to Cyprinodontes'
- 'Cyrtonodus belongs to Cochliodontidae'
- 'Dactylobatus belongs to Rajidae'
- 'Dactylodus belongs to Janassidae'
- 'Dactylopteridae belongs to Dactylopteriformes'
- 'Dactylopteriformes was reranked as a unranked clade and belongs to Cataphracti'
- 'Dactyloscopidae belongs to Uranoscopiformes'
- 'Dalatias belongs to Squalidae'
- 'Dalliidae belongs to Xenomi'
- 'Dasyatidae belongs to Masticura'
- 'Dasyatis belongs to Dasyatidae'
- 'Dasybatus belongs to Rajidae'
- 'Dasylepis belongs to Thelodontidae'
- 'Deania belongs to Squalidae'
- 'Deinodus belongs to Ptyctodontidae'
- 'Deltodopsis belongs to Cochliodontidae'
- 'Deltodus belongs to Cochliodontidae'
- 'Deltoptychius belongs to Cochliodontidae'
- 'Demiurga belongs to Rhinobatidae'
- 'Denticidae belongs to Kurtiformes'
- 'Dercetidae belongs to Hoplopleuri'
- 'Derepodichthyidae belongs to Zoarciformes'
- 'Derichthyidae belongs to Carencheli'
- 'Desmacanthus belongs to Heterodontidae'
- 'Desmiodus belongs to Orodontidae'
- 'Diabolichthys belongs to Mobulidae'
- 'Diacranodus belongs to Xenacanthidae'
- 'Dianidae belongs to Bramiformes'
- 'Dicentrodus belongs to Cladodontidae'
- 'Dicerobatus belongs to Mobulidae'
- 'Dichelodus belongs to Cochliodontidae'
- 'Diclitodus belongs to Heterodontidae'
- 'Dicrenodus belongs to Janassidae'
- 'Dictea belongs to Janassidae'
- 'Dictyolepis belongs to Thelodontidae'
- 'Dictyopygidae belongs to Chondrostei'
- 'Didymodus belongs to Xenacanthidae'
- 'Dimyleus belongs to Psammodontidae'
- 'Dinichthyidae belongs to Arthrothoraci'
- 'Dinichthys belongs to Dinichthyidae'
- 'Dinognathus belongs to Mylostomidae'
- 'Dinomylostoma belongs to Mylostomidae'
- 'Dinopterygidae belongs to Berycoidei'
- 'Diodontidae belongs to Gymnodontes'
- 'Diodontopsodus belongs to Peripristidae'
- 'Diphyodontidae belongs to Chondrostei'
- 'Diplacanthidae belongs to Acanthodei'
- 'Diplacanthus belongs to Diplacanthidae'
- 'Diplacodus belongs to Cochliodontidae'
- 'Diplodus belongs to Xenacanthidae'
- 'Diplognathus belongs to Selenosteidae'
- 'Diplomystidae belongs to Nematognathii'
- 'Diploprionidae belongs to Kurtiformes'
- 'Dipneusta belongs to Pisces'
- 'Dipteridae belongs to Ctenodipterini'
- 'Dipturus belongs to Rajidae'
- 'Diretmidae belongs to Berycoidei'
- 'Dirrhizodon belongs to Galeidae'
- 'Disceus belongs to Dasyatidae'
- 'Discobatis belongs to Dasyatidae'
- 'Discobatus belongs to Platyrhinidae'
- 'Discocephali belongs to Teleostei'
- 'Discopyge belongs to Torpedinidae'
- 'Discotrygon belongs to Dasyatidae'
- 'Dittodus belongs to Xenacanthidae'
- 'Dolichorhynchus belongs to Branchiostomidae'
- 'Doliodus belongs to Xenacanthidae'
- 'Doradidae belongs to Nematognathii'
- 'Dorosomidae belongs to Clupeoidei'
- 'Dorypteridae belongs to Chondrostei'
- 'Draconettidae belongs to Callionymiformes'
- 'Drepanaspidae belongs to Heterostraci'
- 'Drepanaspis belongs to Drepanaspidae'
- 'Drepanephorus belongs to Heterodontidae'
- 'Drepanidae belongs to Ephippiformes'
- 'Dussumieriinae was reranked as the family Dussumieriidae and belongs to Clupeoidei'
- 'Dyptychosteus belongs to Psammosteidae'
- 'Dysommidae belongs to Congroidei'
- 'Echelidae belongs to Congroidei'
- 'Echeneidae belongs to Discocephali'
- 'Echinodus belongs to Heterodontidae'
- 'Echinorhinus belongs to Scymnorhinidae'
- 'Edestidae belongs to Prosarthri'
- 'Edestus belongs to Edestidae'
- 'Elasmobranchii was reranked as a class and belongs to Vertebrata'
- 'Elassomidae belongs to Kurtiformes'
- 'Electrophoridae belongs to Gymnonoti'
- 'Eleotridae belongs to Gobioidea'
- 'Elephenoridae belongs to Bramiformes'
- 'Ellipesurus belongs to Dasyatidae'
- 'Elopidae belongs to Elopoidea'
- 'Elopoidea belongs to Isospondyli'
- 'Embiotocidae belongs to Holconoti'
- 'Emblemariidae belongs to Blenniiformes'
- 'Emmelichthyidae belongs to Kurtiformes'
- 'Encheliidae belongs to Congroidei'
- 'Enchelycephali belongs to Apodes'
- 'Enchodontidae belongs to Enchodontoidei'
- 'Enchodontoidei belongs to Isospondyli'
- 'Engraulidae belongs to Clupeoidei'
- 'Enoplosidae belongs to Kurtiformes'
- 'Entosphenus belongs to Petromyzonidae'
- 'Entoxychirus belongs to Squalidae'
- 'Eoorodus belongs to Orodontidae'
- 'Ephippidae belongs to Ephippiformes'
- 'Ephippiformes was reranked as a unranked clade and belongs to Cirrhitoidei'
- 'Epigonichthyidae belongs to Amphioxi'
- 'Epigonichthys belongs to Epigonichthyidae'
- 'Epinephelinae was reranked as the family Epinephelidae and belongs to Kurtiformes'
- 'Eptatretidae belongs to Hyperotreta'
- 'Eptatretus belongs to Eptatretidae'
- 'Eretmophoridae belongs to Anacanthini'
- 'Ereuniidae belongs to Cottiformes'
- 'Eridacnis belongs to Galeidae'
- 'Erilepidae belongs to Hexagrammiformes'
- 'Erythrinolepidae belongs to Clupeoidei'
- 'Esoces is corrected as Esocidae and belongs to Haplomi'
- 'Etheostomidae belongs to Kurtiformes'
- 'Etmopterus belongs to Squalidae'
- 'Eucrossorhinus belongs to Orectolobidae'
- 'Euctenius belongs to Edestidae'
- 'Eudontomyzon belongs to Petromyzonidae'
- 'Eugaleus belongs to Galeidae'
- 'Eugomphodus belongs to Carchariidae'
- 'Eulamia belongs to Galeidae'
- 'Eunarce belongs to Torpedinidae'
- 'Eunemacanthus belongs to Heterodontidae'
- 'Euprotomicrus belongs to Scymnorhinidae'
- 'Euryarthra belongs to Rhinobatidae'
- 'Eurypharyngidae belongs to Lyomeri'
- 'Euselachii belongs to Selachii'
- 'Eusphyra belongs to Sphyrnidae'
- 'Euthacanthus belongs to Diplacanthidae'
- 'Eventognathi belongs to Ostariophysi'
- 'Evermannellidae belongs to Iniomi'
- 'Exocoetidae belongs to Synentognathi'
- 'Exoles belongs to Lamnidae'
- 'Exomegas belongs to Geotriidae'
- 'Fayolia belongs to Heterodontidae'
- 'Fimbriotorpedo belongs to Torpedinidae'
- 'Fissodus belongs to Janassidae'
- 'Fistulariidae belongs to Aulostomi'
- 'Fitzroyiidae belongs to Cyprinodontes'
- 'Flutidae belongs to Ichthyocephalia'
- 'Forficidae belongs to Synentognathi'
- 'Furidae belongs to Halecomorphi'
- 'Gadidae belongs to Anacanthini'
- 'Gadopsidae belongs to Gadopsiformes'
- 'Gadopsiformes belongs to Trichodontiformes'
- 'Gaidropsaridae belongs to Anacanthini'
- 'Galaxiidae belongs to Salmonoidei'
- 'Galei belongs to Euselachii'
- 'Galeidae belongs to Galeoidei'
- 'Galeocerdo belongs to Galeidae'
- 'Galeoidei belongs to Euselachii'
- 'Galeorhinus belongs to Galeidae'
- 'Galeus belongs to Galeidae'
- 'Gamphacanthus belongs to Janassidae'
- 'Ganoidei was reranked as a superorder and belongs to Actinopteri'
- 'Ganolytidae belongs to Elopoidea'
- 'Gasteropelecidae belongs to Heterognathi'
- 'Gasterosteidae belongs to Hemibranchii'
- 'Geisacanthus belongs to Heterodontidae'
- 'Gempylidae belongs to Scombriformes'
- 'Gemuendina belongs to Galeidae'
- 'Geotria belongs to Geotriidae'
- 'Geotriidae belongs to Hyperoartia'
- 'Gerridae belongs to Kurtiformes'
- 'Gigactinidae belongs to Pediculati'
- 'Gigantichthys belongs to Coccosteidae'
- 'Giganturidae belongs to Atelaxia'
- 'Ginglymodi was reranked as a suborder and belongs to Holostei'
- 'Ginglymostoma belongs to Ginglystomidae'
- 'Ginglystomidae belongs to Galei'
- 'Girellidae belongs to Kurtiformes'
- 'Glaniostomi belongs to Ganoidei'
- 'Glaucosomidae belongs to Kurtiformes'
- 'Glaucostegus belongs to Rhinobatidae'
- 'Glossodus belongs to Janassidae'
- 'Glymmatacanthus belongs to Heterodontidae'
- 'Glyphanodus belongs to Janassidae'
- 'Glyphis belongs to Galeidae'
- 'Glyptaspis belongs to Coccosteidae'
- 'Gnathanacanthidae belongs to Scorpaeniformes'
- 'Gobiesocidae belongs to Xenopterygii'
- 'Gobiidae belongs to Gobioidea'
- 'Gobioidea belongs to Teleostei'
- 'Gobioididae belongs to Gobioidea'
- 'Gomphacanthus belongs to Janassidae'
- 'Gomphodus belongs to Thelodontidae'
- 'Goniobatis belongs to Myliobatidae'
- 'Goniodus belongs to Scymnorhinidae'
- 'Gonionarce belongs to Torpedinidae'
- 'Gonorhynchidae belongs to Clupeoidei'
- 'Gonostomidae belongs to Enchodontoidei'
- 'Gooeidae belongs to Cyprinodontes'
- 'Gorgonichthys belongs to Dinichthyidae'
- 'Grammicolepidae belongs to Zeoidei'
- 'Gymnarchidae belongs to Scyphophori'
- 'Gymnodontes was reranked as a suborder and belongs to Plectognathi'
- 'Gymnonoti belongs to Ostariophysi'
- 'Gymnotidae belongs to Gymnonoti'
- 'Gymnotorpedo belongs to Torpedinidae'
- 'Gymnura belongs to Dasyatidae'
- 'Gyracanthidae belongs to Ichthyotomi'
- 'Gyracanthus belongs to Gyracanthidae'
- 'Gyrace belongs to Galeidae'
- 'Gyropleurodus belongs to Heterodontidae'
- 'Halaelurus belongs to Scylliorhinidae'
- 'Halecomorphi belongs to Ganoidei'
- 'Halosauridae belongs to Lyopomi'
- 'Hannovera belongs to Cetorhinidae'
- 'Haplacanthus belongs to Acanthoessidae'
- 'Haploblepharus belongs to Scylliorhinidae'
- 'Haplodoci belongs to Jugulares'
- 'Haploglossa belongs to Petromyzonidae'
- 'Haplomi belongs to Ostariophysi'
- 'Harpacodus belongs to Janassidae'
- 'Harpagiferidae belongs to Nototheniiformes'
- 'Harpodontidae belongs to Iniomi'
- 'Harriotta belongs to Rhinochimaeridae'
- 'Helicoprion belongs to Edestidae'
- 'Helodopsis belongs to Cochliodontidae'
- 'Helodus belongs to Cochliodontidae'
- 'Helostomidae belongs to Labyrinthici'
- 'Hemerocoetidae belongs to Percophidiformes'
- 'Hemibranchii belongs to Thoracostei'
- 'Hemigaleus belongs to Galeidae'
- 'Hemiodontidae belongs to Heterognathi'
- 'Hemipristis belongs to Galeidae'
- 'Hemiptychodus belongs to Dasyatidae'
- 'Hemiramphidae belongs to Synentognathi'
- 'Hemiscylliidae belongs to Galei'
- 'Hemiscyllium belongs to Hemiscylliidae'
- 'Hemitripteridae belongs to Cottiformes'
- 'Hemitrygon belongs to Dasyatidae'
- 'Henicichthyidae belongs to Kurtiformes'
- 'Heptatrema belongs to Eptatretidae'
- 'Heptranchias belongs to Hexanchidae'
- 'Heteracanthus belongs to Acanthoessidae'
- 'Heterenchelyidae belongs to Colocephali'
- 'Heterocongridae belongs to Congroidei'
- 'Heterodontidae belongs to Prosarthri'
- 'Heterodontus belongs to Heterodontidae'
- 'Heterognathi belongs to Ostariophysi'
- 'Heteromi belongs to Teleostei'
- 'Heteronarce belongs to Torpedinidae'
- 'Heteropleuron is a subjective synonym of Epigonichthys'
- 'Heteroscyllium belongs to Orectolobidae'
- 'Heteroscymnus belongs to Somniosidae'
- 'Heterosomata belongs to Ostariophysi'
- 'Heterosteus belongs to Chelonichthyidae'
- 'Heterostraci was reranked as a order and belongs to Ostracophori'
- 'Hexabranchus belongs to Eptatretidae'
- 'Hexagrammidae belongs to Hexagrammiformes'
- 'Hexagrammiformes belongs to Cataphracti'
- 'Hexanchidae belongs to Opistharthri'
- 'Hexanchus belongs to Hexanchidae'
- 'Hieroptera belongs to Rajidae'
- 'Himantolophidae belongs to Pediculati'
- 'Himantura belongs to Dasyatidae'
- 'Hiodontidae belongs to Clupeoidei'
- 'Hippoglossidae belongs to Heterosomata'
- 'Histichthyes belongs to Allotriognathi'
- 'Histiopteridae belongs to Kurtiformes'
- 'Holacanthodes belongs to Acanthoessidae'
- 'Holaspis belongs to Pteraspidae'
- 'Holconoti belongs to Acanthopterygii'
- 'Holocentridae belongs to Berycoidei'
- 'Holocephali was reranked as a subclass and belongs to Elasmobranchii'
- 'Holonema belongs to Phyllolepidae'
- 'Holopetalichthys belongs to Titanichthyidae'
- 'Holoptychiidae [misspelled as Holoptychidae] belongs to Rhipidistia'
- 'Holorhinus belongs to Myliobatidae'
- 'Holostei was reranked as a order and belongs to Ganoidei'
- 'Holostomi belongs to Symbranchia'
- 'Homalodus belongs to Psammodontidae'
- 'Homalopteridae belongs to Eventognathi'
- 'Homea belongs to Eptatretidae'
- 'Homosteus belongs to Chelonichthyidae'
- 'Hoplichthyidae belongs to Platycephaliformes'
- 'Hoplodus belongs to Peripristidae'
- 'Hoplonchus belongs to Heterodontidae'
- 'Hoplopagridae belongs to Kurtiformes'
- 'Hoplopleuri belongs to Heteromi'
- 'Hoplopterygidae belongs to Berycoidei'
- 'Hussakofia belongs to Dinichthyidae'
- 'Hybocladodus belongs to Cladodontidae'
- 'Hybodopsis belongs to Heterodontidae'
- 'Hybodus belongs to Heterodontidae'
- 'Hydrolagus belongs to Chimaeridae'
- 'Hyperoartia belongs to Marsipobranchii'
- 'Hyperotreti [misspelled as Hyperotreta] belongs to Marsipobranchii'
- 'Hypnarce belongs to Torpedinidae'
- 'Hypnos belongs to Torpedinidae'
- 'Hypolophus [misspelled as Hyplophus] belongs to Dasyatidae'
- 'Hypophthalmidae belongs to Nematognathii'
- 'Hypoprion belongs to Galeidae'
- 'Hypopriondon belongs to Galeidae'
- 'Hypoptychidae belongs to Ammodytiformes'
- 'Hypostomides belongs to Acanthopterygii'
- 'Hysterocarpidae belongs to Holconoti'
- 'Icanodus belongs to Cochliodontidae'
- 'Icelidae belongs to Cottiformes'
- 'Ichthyocephalia belongs to Symbranchia'
- 'Ichthyodectidae belongs to Clupeoidei'
- 'Ichthyomyzon belongs to Petromyzonidae'
- 'Ichthyosauroides belongs to Chelonichthyidae'
- 'Ichtyotomi is corrected as Ichthyotomi and belongs to Selachii'
- 'Icosteidae belongs to Icosteiformes'
- 'Icosteiformes belongs to Rhegnopteri'
- 'Ictinocephalus belongs to Ischnacanthidae'
- 'Idiacanthidae belongs to Enchodontoidei'
- 'Ilyophidae belongs to Anguilloidei'
- 'Inermiidae belongs to Kurtiformes'
- 'Iniomi belongs to Ostariophysi'
- 'Ipnopidae belongs to Iniomi'
- 'Ischnacanthidae belongs to Acanthodei'
- 'Ischnacanthus belongs to Ischnacanthidae'
- 'Isistius belongs to Scymnorhinidae'
- 'Isogomphodon belongs to Galeidae'
- 'Isoplagiodon belongs to Galeidae'
- 'Isospondyli belongs to Teleostei'
- 'Istiophoridae belongs to Xiphiiformes'
- 'Isuropsis belongs to Lamnidae'
- 'Isurus belongs to Lamnidae'
- 'Janassa belongs to Janassidae'
- 'Janassidae belongs to Janassides'
- 'Janassides belongs to Cestraciontes'
- 'Jordaniidae belongs to Cottiformes'
- 'Jugulares belongs to Teleostei'
- 'Kallostracon [misspelled as Kallostrakon] belongs to Pteraspidae'
- 'Kneriidae belongs to Clupeoidei'
- 'Kuhliidae belongs to Kurtiformes'
- 'Kurtiformes was reranked as a unranked clade and belongs to Rhegnopteri'
- 'Kyphosidae belongs to Kurtiformes'
- 'Labracoglossidae belongs to Kurtiformes'
- 'Labroidei is corrected as Labridae and belongs to Pharyngognathi'
- 'Labyrinthici belongs to Acanthopterygii'
- 'Lactariidae belongs to Carangiformes'
- 'Laemargus belongs to Somniosidae'
- 'Laeviraja belongs to Rajidae'
- 'Lagarodus belongs to Psammodontidae'
- 'Lambdodus belongs to Cladodontidae'
- 'Lamia belongs to Lamnidae'
- 'Lamiopsis belongs to Galeidae'
- 'Lamna belongs to Lamnidae'
- 'Lamnidae belongs to Lamnoidei'
- 'Lamnoidei belongs to Galei'
- 'Lampetra belongs to Petromyzonidae'
- 'Lampreda belongs to Petromyzonidae'
- 'Lampridae belongs to Selenichthyes'
- 'Lanarkia belongs to Thelodontidae'
- 'Latidae belongs to Kurtiformes'
- 'Latridae belongs to Cirrhitoidei'
- 'Leiacanthus belongs to Heterodontidae'
- 'Leiobatus belongs to Rhinobatidae'
- 'Leiodon belongs to Somniosidae'
- 'Leiodus belongs to Orodontidae'
- 'Leiognathidae belongs to Carangiformes'
- 'Leius belongs to Scymnorhinidae'
- 'Lepidoglanidae belongs to Nematognathii'
- 'Lepidorhinus belongs to Squalidae'
- 'Lepidosirenidae belongs to Sirenoidei'
- 'Lepisosteidae belongs to Ginglymodi'
- 'Lepracanthus belongs to Heterodontidae'
- 'Leptocarcharias belongs to Galeidae'
- 'Leptocardii belongs to Cephalochordata'
- 'Leptocarias belongs to Galeidae'
- 'Leptocharias belongs to Galeidae'
- 'Leptocheles belongs to Onchidae'
- 'Leptolepididae is corrected as Leptolepidae and belongs to Pholidophoroidei'
- 'Leptoscopidae belongs to Uranoscopiformes'
- 'Leptostyrax belongs to Lamnidae'
- 'Lethenteron belongs to Petromyzonidae'
- 'Lethrinidae belongs to Kurtiformes'
- 'Leucoraja belongs to Rajidae'
- 'Limnichthyidae belongs to Percophidiformes'
- 'Liodesmidae belongs to Halecomorphi'
- 'Liognathus belongs to Coccosteidae'
- 'Liparidae belongs to Cyclopteriformes'
- 'Liparopidae belongs to Cyclopteriformes'
- 'Lipogenyidae belongs to Lyopomi'
- 'Lisgodus belongs to Janassidae'
- 'Lispacanthus belongs to Heterodontidae'
- 'Lispognathus belongs to Coccosteidae'
- 'Lissoprion belongs to Edestidae'
- 'Lobotidae belongs to Kurtiformes'
- 'Lophacanthus belongs to Xenacanthidae'
- 'Lophiidae belongs to Pediculati'
- 'Lophobranchi [misspelled as Lophobranchii] belongs to Thoracostei'
- 'Lophodus belongs to Cochliodontidae'
- 'Lophosteus belongs to Psammosteidae'
- 'Lophostracon belongs to Coccosteidae'
- 'Lophotidae belongs to Histichthyes'
- 'Loricariidae belongs to Nematognathii'
- 'Loxodon belongs to Galeidae'
- 'Luciocephalidae belongs to Labyrinthici'
- 'Lumpenidae belongs to Blenniiformes'
- 'Lutjanidae [misspelled as Lutianidae] belongs to Kurtiformes'
- 'Luvaridae belongs to Luvariformes'
- 'Luvariformes belongs to Percomorphi'
- 'Lycodapodidae belongs to Zoarciformes'
- 'Lyomeri belongs to Apodes'
- 'Lyopomi belongs to Teleostei'
- 'Machaeracanthus belongs to Acanthoessidae'
- 'Machaerius belongs to Acanthoessidae'
- 'Machaerognathus belongs to Dinichthyidae'
- 'Machephilus belongs to Squalidae'
- 'Macristiidae belongs to Clupeoidei'
- 'Macropetalichthyidae belongs to Stegophthalami'
- 'Macropetalichthys belongs to Macropetalichthyidae'
- 'Macropthalmia belongs to Geotriidae'
- 'Macrorhamphosidae belongs to Aulostomi'
- 'Macrosemiidae belongs to Halecomorphi'
- 'Macrouridae belongs to Anacanthini'
- 'Macrouroididae belongs to Anacanthini'
- 'Maenidae belongs to Kurtiformes'
- 'Malacanthidae belongs to Kurtiformes'
- 'Malacorhina belongs to Rajidae'
- 'Malacosteidae belongs to Iniomi'
- 'Malapteruridae belongs to Nematognathii'
- 'Manta belongs to Mobulidae'
- 'Marsdenius belongs to Diplacanthidae'
- 'Marsipobranchii belongs to Cephalochordata'
- 'Mastacembelidae belongs to Opisthomi'
- 'Masticura belongs to Batoidea'
- 'Maurolicidae belongs to Enchodontoidei'
- 'Mazodus belongs to Psammodontidae'
- 'Medidae belongs to Eventognathi'
- 'Megalichthyidae belongs to Rhipidistia'
- 'Megalopidae belongs to Elopoidea'
- 'Melamphaidae belongs to Xenoberyces'
- 'Melanocetidae belongs to Pediculati'
- 'Melanotaeniidae belongs to Percesoces'
- 'Melittomalepis belongs to Thelodontidae'
- 'Menidae belongs to Carangiformes'
- 'Meristodon belongs to Heterodontidae'
- 'Merlucciidae belongs to Anacanthini'
- 'Mesacanthus belongs to Acanthoessidae'
- 'Mesiteia belongs to Scylliorhinidae'
- 'Mesodmodus belongs to Orodontidae'
- 'Mesogomphus belongs to Psammodontidae'
- 'Mesolophodus belongs to Janassidae'
- 'Micristodus belongs to Rhineodontidae'
- 'Micromesus belongs to Rhinopteridae'
- 'Microstomidae belongs to Salmonoidei'
- 'Mitrodus belongs to Gyracanthidae'
- 'Mitsukurina belongs to Mitsukurinidae'
- 'Mitsukurinidae belongs to Lamnoidei'
- 'Mobula belongs to Mobulidae'
- 'Mobulidae belongs to Masticura'
- 'Mochokidae belongs to Nematognathii'
- 'Molidae belongs to Gymnodontes'
- 'Monacanthidae belongs to Sclerodermi'
- 'Monocentridae belongs to Berycoidei'
- 'Monocladodus belongs to Cladodontidae'
- 'Monodactylidae belongs to Ephippiformes'
- 'Monopterhinus belongs to Hexanchidae'
- 'Mordacia belongs to Geotriidae'
- 'Moringuidae belongs to Congroidei'
- 'Mormyridae belongs to Scyphophori'
- 'Moronidae belongs to Kurtiformes'
- 'Mugilidae belongs to Percesoces'
- 'Muglioididae belongs to Percophidiformes'
- 'Mullidae belongs to Kurtiformes'
- 'Muraenesocidae belongs to Congroidei'
- 'Muraenidae belongs to Colocephali'
- 'Muraenoblenna belongs to Myxinidae'
- 'Muraenolepidae belongs to Anacanthini'
- 'Mustelus belongs to Galeidae'
- 'Myctophidae belongs to Iniomi'
- 'Mylacodus belongs to Psammodontidae'
- 'Mylax belongs to Psammodontidae'
- 'Myliobatidae belongs to Masticura'
- 'Myliobatis belongs to Myliobatidae'
- 'Mylorhina belongs to Rhinopteridae'
- 'Mylostoma belongs to Mylostomidae'
- 'Mylostomatidae [misspelled as Mylostomidae] belongs to Arthrothoraci'
- 'Myriacanthidae belongs to Chimaeroidei'
- 'Myriacanthus belongs to Myriacanthidae'
- 'Myriosteon belongs to Pristidae'
- 'Myrmillo belongs to Galeidae'
- 'Myrocongridae belongs to Congroidei'
- 'Myxine belongs to Myxinidae'
- 'Myxinidae belongs to Hyperotreta'
- 'Nandidae belongs to Kurtiformes'
- 'Nannatherinidae belongs to Percesoces'
- 'Narcacion belongs to Torpedinidae'
- 'Narcaciontes belongs to Batoidei'
- 'Narcine belongs to Torpedinidae'
- 'Narcobatus belongs to Torpedinidae'
- 'Narke belongs to Torpedinidae'
- 'Nasisqualus belongs to Squalidae'
- 'Naulas belongs to Onchidae'
- 'Nebrius belongs to Ginglystomidae'
- 'Nebrodes belongs to Ginglystomidae'
- 'Neenchelyidae belongs to Congroidei'
- 'Nemacanthus belongs to Heterodontidae'
- 'Nematistiidae belongs to Carangiformes'
- 'Nematognathi was reranked as the order Nematognathii and belongs to Ostariophysi'
- 'Nemichthyidae belongs to Congroidei'
- 'Neolabridae belongs to Pharyngognathi'
- 'Neoletherinidae belongs to Kurtiformes'
- 'Neomordacia belongs to Geotriidae'
- 'Neophrynichthyidae belongs to Cottiformes'
- 'Neotrygon belongs to Dasyatidae'
- 'Nettastomidae belongs to Congroidei'
- 'Niphonidae belongs to Kurtiformes'
- 'Nomeidae belongs to Stromateiformes'
- 'Nostolepis belongs to Thelodontidae'
- 'Notidanus belongs to Hexanchidae'
- 'Notogoneidae belongs to Clupeoidei'
- 'Notograptidae belongs to Blenniiformes'
- 'Notopteridae belongs to Notopteroidei'
- 'Notopteroidei belongs to Isospondyli'
- 'Notorhynchus belongs to Hexanchidae'
- 'Nototheniidae belongs to Nototheniiformes'
- 'Nototheniiformes belongs to Jugulares'
- 'Oceanomyzon belongs to Petromyzonidae'
- 'Ochlodus belongs to Xenacanthidae'
- 'Octinapsis belongs to Orodontidae'
- 'Odacidae belongs to Pharyngognathi'
- 'Odontaspis belongs to Carchariidae'
- 'Oestophorus belongs to Edestidae'
- 'Ogcocephalidae belongs to Pediculati'
- 'Okkelbergia belongs to Petromyzonidae'
- 'Oligopleuridae belongs to Pholidophoroidei'
- 'Oligoridae belongs to Kurtiformes'
- 'Omosudidae belongs to Iniomi'
- 'Onchidae belongs to Polyspondyli'
- 'Onchopristis [misspelled as Onychopristis] belongs to Pristidae'
- 'Onchus belongs to Onchidae'
- 'Oncobatis belongs to Rajidae'
- 'Oniscolepis belongs to Thelodontidae'
- 'Onychodontidae belongs to Rhipidistia'
- 'Ophicephalidae belongs to Labyrinthici'
- 'Ophichthidae is corrected as Ophichthyidae and belongs to Congroidei'
- 'Ophidiidae belongs to Ophidiiformes'
- 'Ophidiiformes was reranked as a unranked clade and belongs to Jugulares'
- 'Ophioclinidae belongs to Blenniiformes'
- 'Ophiodontidae belongs to Hexagrammiformes'
- 'Opistharthri belongs to Notidani'
- 'Opisthognathidae belongs to Uranoscopiformes'
- 'Opisthomi belongs to Teleostei'
- 'Opisthomyzonidae belongs to Discocephali'
- 'Opisthoproctidae belongs to Enchodontoidei'
- 'Oplegnathidae belongs to Kurtiformes'
- 'Orectolobidae belongs to Galei'
- 'Orectolobus belongs to Orectolobidae'
- 'Orodontidae belongs to Prosarthri'
- 'Orodus belongs to Orodontidae'
- 'Orthacanthus belongs to Xenacanthidae'
- 'Orthacodus belongs to Lamnidae'
- 'Orthodon belongs to Scylliorhinidae'
- 'Orthopleurodus belongs to Cochliodontidae'
- 'Orthybodus belongs to Heterodontidae'
- 'Osmeridae belongs to Salmonoidei'
- 'Osphronemidae belongs to Labyrinthici'
- 'Ostariophysi was reranked as a unranked clade and belongs to Teleostei'
- 'Osteoglossidae belongs to Osteoglossoidea'
- 'Osteoglossoidei is corrected as Osteoglossoidea and belongs to Isospondyli'
- 'Osteolepidae belongs to Rhipidistia'
- 'Ostraciidae belongs to Ostracodermi'
- 'Ostracodermi belongs to Jugulares'
- 'Ostracophori belongs to Vertebrata'
- 'Otholithinae was reranked as the family Otholithidae and belongs to Kurtiformes'
- 'Otodus belongs to Lamnidae'
- 'Owstoniidae belongs to Uranoscopiformes'
- 'Oxudercidae belongs to Percophidiformes'
- 'Oxylebiidae belongs to Hexagrammiformes'
- 'Oxynotidae belongs to Squaloidei'
- 'Oxynotus belongs to Oxynotidae'
- 'Oxyrhina belongs to Lamnidae'
- 'Oxytes belongs to Carchariidae'
- 'Oxytomodus belongs to Cochliodontidae'
- 'Pachycormidae belongs to Halecomorphi'
- 'Pachylepis belongs to Thelodontidae'
- 'Pachyosteus belongs to Dinichthyidae'
- 'Palaeaspis belongs to Pteraspidae'
- 'Palaeobates belongs to Psammodontidae'
- 'Palaeoniscidae belongs to Chondrostei'
- 'Palaeorhynchidae belongs to Xiphiiformes'
- 'Palaeoscyllium belongs to Scylliorhinidae'
- 'Palaeospinax belongs to Heterodontidae'
- 'Palaeoteuthis belongs to Pteraspidae'
- 'Pampidae belongs to Stromateiformes'
- 'Pangasiidae belongs to Nematognathii'
- 'Pantodontidae belongs to Osteoglossoidea'
- 'Paracentroscyllium belongs to Squalidae'
- 'Paracymatodus belongs to Janassidae'
- 'Paralepididae is corrected as Paralepidae and belongs to Iniomi'
- 'Paralichthyidae belongs to Heterosomata'
- 'Paramaturus belongs to Scylliorhinidae'
- 'Paramphioxus is a subjective synonym of Epigonichthys'
- 'Paramyxine belongs to Eptatretidae'
- 'Parapercidae belongs to Percophidiformes'
- 'Parascyllium belongs to Scylliorhinidae'
- 'Paratrygon belongs to Dasyatidae'
- 'Parexus belongs to Diplacanthidae'
- 'Parhybodus belongs to Heterodontidae'
- 'Pastinaca belongs to Dasyatidae'
- 'Pastinachus belongs to Dasyatidae'
- 'Pataecidae belongs to Scorpaeniformes'
- 'Pediculati belongs to Teleostei'
- 'Pegasidae belongs to Hypostomides'
- 'Pelonectes belongs to Acanthoessidae'
- 'Peltodus belongs to Janassidae'
- 'Pempheridae belongs to Kurtiformes'
- 'Pentagonolepis belongs to Phyllolepidae'
- 'Pentanchidae belongs to Galei'
- 'Pentanchus belongs to Pentanchidae'
- 'Percesoces belongs to Percomorphi'
- 'Percichthyidae belongs to Kurtiformes'
- 'Percidae belongs to Kurtiformes'
- 'Perciliidae belongs to Kurtiformes'
- 'Percomorphi belongs to Acanthopterygii'
- 'Percophididae belongs to Percophidiformes'
- 'Percophidiformes belongs to Jugulares'
- 'Percopsidae belongs to Salmopercae'
- 'Periophthalmidae belongs to Gobioidea'
- 'Periplectrodus belongs to Cochliodontidae'
- 'Peripristidae belongs to Janassides'
- 'Peripristis belongs to Peripristidae'
- 'Perissognathus belongs to Dinichthyidae'
- 'Peristediidae belongs to Trigliformes'
- 'Peronedyidae belongs to Blenniiformes'
- 'Petalodopsis belongs to Janassidae'
- 'Petalodus belongs to Janassidae'
- 'Petalorhynchus belongs to Janassidae'
- 'Petrodus belongs to Orodontidae'
- 'Petromyzon belongs to Petromyzonidae'
- 'Petromyzontidae [misspelled as Petromyzonidae] belongs to Hyperoartia'
- 'Phallostethidae belongs to Cyprinodontes'
- 'Phaneropleurini is corrected as Phaneropleuridae and belongs to Ctenodipterini'
- 'Pharyngognathi belongs to Teleostei'
- 'Pharyngopilidae belongs to Pharyngognathi'
- 'Phlyctaenaspis belongs to Coccosteidae'
- 'Phlyctaenium belongs to Dinichthyidae'
- 'Phlyctaenius belongs to Coccosteidae'
- 'Phoderacanthus belongs to Janassidae'
- 'Phoebodus belongs to Cladodontidae'
- 'Pholidae belongs to Blenniiformes'
- 'Pholidophoridae belongs to Pholidophoroidei'
- 'Pholidophoroidei belongs to Isospondyli'
- 'Pholidosteus belongs to Pteraspidae'
- 'Phorcynis [misspelled as Phorcynus] belongs to Squatinidae'
- 'Phractolaemidae belongs to Clupeoidei'
- 'Phricacanthus belongs to Xenacanthidae'
- 'Phyllolepidae belongs to Arthrothoraci'
- 'Phyllolepis belongs to Phyllolepidae'
- 'Physichthys belongs to Coccosteidae'
- 'Physodon belongs to Galeidae'
- 'Physonemus belongs to Heterodontidae'
- 'Pimelodidae belongs to Nematognathii'
- 'Pinacodus belongs to Psammodontidae'
- 'Placosteus belongs to Psammosteidae'
- 'Plagyodontidae belongs to Iniomi'
- 'Platacanthus belongs to Janassidae'
- 'Platacidae belongs to Ephippiformes'
- 'Platopterus belongs to Rajidae'
- 'Platyaspis belongs to Dinichthyidae'
- 'Platycephalidae belongs to Platycephaliformes'
- 'Platycephaliformes belongs to Cataphracti'
- 'Platyodus belongs to Cochliodontidae'
- 'Platypodon belongs to Galeidae'
- 'Platyrhina belongs to Platyrhinidae'
- 'Platyrhinidae belongs to Sarcura'
- 'Platyrhinoidis belongs to Platyrhinidae'
- 'Platysomidae belongs to Chondrostei'
- 'Platyspondylus belongs to Rajidae'
- 'Platysqualus belongs to Sphyrnidae'
- 'Platyxystrodus belongs to Cochliodontidae'
- 'Plecoglossidae belongs to Salmonoidei'
- 'Plectognathi belongs to Teleostei'
- 'Plectrostoma belongs to Lamnidae'
- 'Plesiopidae belongs to Kurtiformes'
- 'Pleuracanthus belongs to Xenacanthidae'
- 'Pleuracromylon belongs to Galeidae'
- 'Pleurodus belongs to Cochliodontidae'
- 'Pleurogomphus belongs to Psammodontidae'
- 'Pleuronectidae belongs to Heterosomata'
- 'Pleuroplax belongs to Cochliodontidae'
- 'Pleuropterygii belongs to Selachii'
- 'Plicodus belongs to Ginglystomidae'
- 'Pliotrema belongs to Pliotremidae'
- 'Pliotremidae belongs to Galeoidei'
- 'Plotosidae belongs to Nematognathii'
- 'Pnigeacanthus belongs to Janassidae'
- 'Poeciliidae [misspelled as Poeciiidae] belongs to Cyprinodontes'
- 'Poecilodus belongs to Cochliodontidae'
- 'Polistotrema belongs to Eptatretidae'
- 'Polyacanthidae belongs to Labyrinthici'
- 'Polyacrodus belongs to Heterodontidae'
- 'Polycentridae belongs to Kurtiformes'
- 'Polymixiidae belongs to Berycoidei'
- 'Polynemidae belongs to Rhegnopteri'
- 'Polyodontidae belongs to Selachostomi'
- 'Polyprosopus belongs to Cetorhinidae'
- 'Polypteridae belongs to Cladistia'
- 'Polyrhizodus belongs to Janassidae'
- 'Polyspondyli belongs to Selachii'
- 'Pomacentridae belongs to Chromides'
- 'Pomadasidae belongs to Kurtiformes'
- 'Pomatomidae belongs to Carangiformes'
- 'Ponerichthys belongs to Coccosteidae'
- 'Poroderma belongs to Scylliorhinidae'
- 'Potamotrygon belongs to Dasyatidae'
- 'Potamotrygonidae belongs to Masticura'
- 'Priacanthidae belongs to Kurtiformes'
- 'Pricus belongs to Petromyzonidae'
- 'Prionacanthus belongs to Thelodontidae'
- 'Prionace belongs to Galeidae'
- 'Priscacaridae belongs to Chromides'
- 'Pristibatis belongs to Pristidae'
- 'Pristicladodus belongs to Janassidae'
- 'Pristidae belongs to Sarcura'
- 'Pristiophoridae belongs to Galeoidei'
- 'Pristiophorus belongs to Pristiophoridae'
- 'Pristiopsis belongs to Pristidae'
- 'Pristis belongs to Pristidae'
- 'Pristis (Eopristis) was reranked as Eopristis and belongs to Pristidae'
- 'Pristiurus belongs to Scylliorhinidae'
- 'Pristodus belongs to Peripristidae'
- 'Pronotacanthidae belongs to Heteromi'
- 'Propristis belongs to Pristidae'
- 'Propterygia belongs to Rajidae'
- 'Prosarthri belongs to Cestraciontes'
- 'Proscyllium belongs to Scylliorhinidae'
- 'Prospiraxis belongs to Edestidae'
- 'Protitanichthys belongs to Titanichthyidae'
- 'Protodus belongs to Cladodontidae'
- 'Protopirata belongs to Edestidae'
- 'Protopteridae belongs to Sirenoidei'
- 'Protospinax belongs to Squalidae'
- 'Protosyngnathidae belongs to Hemibranchii'
- 'Psammichthyidae belongs to Gobioidea'
- 'Psammobatis belongs to Rajidae'
- 'Psammodontidae belongs to Janassides'
- 'Psammodus belongs to Psammodontidae'
- 'Psammolepis belongs to Psammosteidae'
- 'Psammosteidae belongs to Heterostraci'
- 'Psammosteus belongs to Psammosteidae'
- 'Psephodus belongs to Cochliodontidae'
- 'Psettodidae belongs to Heterosomata'
- 'Pseudocorax belongs to Lamnidae'
- 'Pseudogaleus belongs to Galeidae'
- 'Pseudoplesiopidae belongs to Kurtiformes'
- 'Pseudotriakidae belongs to Galei'
- 'Pseudotriakis belongs to Pseudotriakidae'
- 'Psilacanthus belongs to Heterodontidae'
- 'Psilocephalidae belongs to Sclerodermi'
- 'Psychrolutidae belongs to Cottiformes'
- 'Pteraclidae belongs to Bramiformes'
- 'Pteraspididae [misspelled as Pteraspidae] belongs to Heterostraci'
- 'Pteraspis belongs to Pteraspidae'
- 'Pternodus belongs to Cladodontidae'
- 'Pternodus belongs to Xenacanthidae'
- 'Pterocephalus [misspelled as Pterocephala] belongs to Mobulidae'
- 'Pteromylaeus belongs to Myliobatidae'
- 'Pteroplatea belongs to Dasyatidae'
- 'Pteroplatytrygon belongs to Dasyatidae'
- 'Pteropsaridae belongs to Percophidiformes'
- 'Pterothrissidae belongs to Clupeoidei'
- 'Ptilichthyidae belongs to Blenniiformes'
- 'Ptychacanthus belongs to Heterodontidae'
- 'Ptychodontidae belongs to Masticura'
- 'Ptychodus belongs to Ptychodontidae'
- 'Ptyctodontidae belongs to Chimaeroidei'
- 'Ptyctodus belongs to Ptyctodontidae'
- 'Pycnacanthus belongs to Heterodontidae'
- 'Pycnodontes is corrected as Pycnodontidae and belongs to Pycnodonti'
- 'Pycnodonti belongs to Ganoidei'
- 'Pycnosteus belongs to Psammosteidae'
- 'Pygaeidae belongs to Acanthuriformes'
- 'Pygidiidae belongs to Nematognathii'
- 'Rachycentridae belongs to Carangiformes'
- 'Raja belongs to Rajidae'
- 'Rajidae belongs to Sarcura'
- 'Ramphodus belongs to Ptyctodontidae'
- 'Raphiosauridae belongs to Elopoidea'
- 'Regalecidae belongs to Taeniosomi'
- 'Reighardina belongs to Petromyzonidae'
- 'Reniceps belongs to Sphyrnidae'
- 'Retropinnidae belongs to Salmonoidei'
- 'Rhabdiodus belongs to Heterodontidae'
- 'Rhachinotus belongs to Dasyatidae'
- 'Rhadinacanthus belongs to Acanthoessidae'
- 'Rhamphichthyidae belongs to Gymnonoti'
- 'Rhamphobatis belongs to Rhinidae'
- 'Rhamphocottidae belongs to Cottiformes'
- 'Rhamphodus belongs to Cochliodontidae'
- 'Rhamphosidae belongs to Aulostomi'
- 'Rhegmatidae belongs to Kurtiformes'
- 'Rhegnopteri belongs to Percomorphi'
- 'Rhina belongs to Rhinidae'
- 'Rhincodon belongs to Rhineodontidae'
- 'Rhinellidae belongs to Hoplopleuri'
- 'Rhineodontidae belongs to Galei'
- 'Rhinidae belongs to Sarcura'
- 'Rhinobatidae belongs to Sarcura'
- 'Rhinobatos belongs to Rhinobatidae'
- 'Rhinobatus belongs to Rhinobatidae'
- 'Rhinochimaera belongs to Rhinochimaeridae'
- 'Rhinochimaeridae belongs to Chimaeroidei'
- 'Rhinognathus belongs to Mitsukurinidae'
- 'Rhinoptera belongs to Rhinopteridae'
- 'Rhinopteridae belongs to Masticura'
- 'Rhinoscymnus belongs to Somniosidae'
- 'Rhinotriacis belongs to Galeidae'
- 'Rhipidistia belongs to Crossopterygii'
- 'Rhizoprion belongs to Galeidae'
- 'Rhodichthyidae belongs to Ophidiiformes'
- 'Rhombosoleidae belongs to Heterosomata'
- 'Rhyacichthyidae belongs to Gobioidea'
- 'Rhymodus belongs to Psammodontidae'
- 'Rhynchobatis belongs to Rhinobatidae'
- 'Rhynchobatus belongs to Rhinidae'
- 'Rhynchodus belongs to Ptyctodontidae'
- 'Rinodus belongs to Ptyctodontidae'
- 'Rogeniidae belongs to Synentognathi'
- 'Rondeletiidae belongs to Cetunculi'
- 'Runulidae belongs to Blenniiformes'
- 'Saccopharyngidae belongs to Lyomeri'
- 'Salangidae belongs to Salmonoidei'
- 'Salmonidae belongs to Salmonoidei'
- 'Salmonoidea [misspelled as Salmonoidei] belongs to Isospondyli'
- 'Salmopercae belongs to Ostariophysi'
- 'Samaridae belongs to Heterosomata'
- 'Sandalodus belongs to Cochliodontidae'
- 'Sarcura belongs to Batoidei'
- 'Saurodontidae belongs to Clupeoidei'
- 'Sauromuraenesocidae belongs to Congroidei'
- 'Scapanorhynchus belongs to Mitsukurinidae'
- 'Scaphaspis belongs to Pteraspidae'
- 'Scaridae belongs to Pharyngognathi'
- 'Scatophagidae belongs to Chaetodontiformes'
- 'Schediosteus belongs to Thelodontidae'
- 'Schilbeidae [misspelled as Schlbeidae] belongs to Nematognathii'
- 'Sciaenoidei was reranked as the family Sciaenidae and belongs to Kurtiformes'
- 'Sclerodermi belongs to Plectognathi'
- 'Sclerorhynchus belongs to Pristidae'
- 'Scolecosoma belongs to Petromyzonidae'
- 'Scoliodon belongs to Galeidae'
- 'Scomberesocidae belongs to Synentognathi'
- 'Scomberoidei is corrected as Scombridae and belongs to Scombriformes'
- 'Scombriformes was reranked as a unranked clade and belongs to Rhegnopteri'
- 'Scombropidae belongs to Kurtiformes'
- 'Scorpaenichthyidae belongs to Cottiformes'
- 'Scorpaenidae belongs to Scorpaeniformes'
- 'Scorpaeniformes was reranked as a unranked clade and belongs to Cataphracti'
- 'Scorpidae belongs to Ephippiformes'
- 'Scyliorhinidae [misspelled as Scylliorhinidae] belongs to Galei'
- 'Scyliorhinus [misspelled as Scylliorhinus] belongs to Scylliorhinidae'
- 'Scylliodus belongs to Scylliorhinidae'
- 'Scylliogaleus belongs to Galeidae'
- 'Scyllium belongs to Scylliorhinidae'
- 'Scymnodon belongs to Squalidae'
- 'Scymnorhinidae belongs to Squaloidei'
- 'Scymnorhinus belongs to Scymnorhinidae'
- 'Scymnus belongs to Scymnorhinidae'
- 'Scyphophori belongs to Isospondyli'
- 'Scytalinidae belongs to Zoarciformes'
- 'Selache belongs to Cetorhinidae'
- 'Selachidea belongs to Heterodontidae'
- 'Selachii was reranked as a unranked clade and belongs to Elasmobranchii'
- 'Selachophidichthyoidei belongs to Selachii'
- 'Selachostomi belongs to Ganoidei'
- 'Selanonius belongs to Lamnidae'
- 'Selenichthyes belongs to Ostariophysi'
- 'Selenosteidae belongs to Arthrothoraci'
- 'Selenosteus belongs to Selenosteidae'
- 'Semionotidae belongs to Pycnodonti'
- 'Semiophoridae belongs to Selenichthyes'
- 'Serranidae belongs to Kurtiformes'
- 'Serratodus belongs to Janassidae'
- 'Sillaginidae belongs to Kurtiformes'
- 'Simenchelyidae belongs to Anguilloidei'
- 'Siphonodus belongs to Coccosteidae'
- 'Siphonognathidae belongs to Pharyngognathi'
- 'Sirenoidei belongs to Dipneusta'
- 'Sisoridae belongs to Nematognathii'
- 'Soleidae belongs to Heterosomata'
- 'Solenodus belongs to Psammodontidae'
- 'Solenostomidae belongs to Lophobranchii'
- 'Somniosidae belongs to Squaloidei'
- 'Somniosus belongs to Somniosidae'
- 'Sparisomidae belongs to Pharyngognathi'
- 'Sparoidei is corrected as Sparidae and belongs to Kurtiformes'
- 'Spathobatis belongs to Rhinobatidae'
- 'Sphagodus belongs to Pteraspidae'
- 'Sphenacanthus belongs to Heterodontidae'
- 'Sphenodus belongs to Lamnidae'
- 'Sphenonchus belongs to Heterodontidae'
- 'Sphenophorus belongs to Edestidae'
- 'Sphyra belongs to Sphyrnidae'
- 'Sphyraenidae belongs to Percesoces'
- 'Sphyrichthys belongs to Sphyrnidae'
- 'Sphyrna belongs to Sphyrnidae'
- 'Sphyrnias belongs to Sphyrnidae'
- 'Sphyrnidae belongs to Galeoidei'
- 'Spinacanthidae belongs to Sclerodermi'
- 'Spinax belongs to Squalidae'
- 'Spiraxis belongs to Edestidae'
- 'Spirodus belongs to Thelodontidae'
- 'Sporetodus belongs to Dasyatidae'
- 'Squalidae belongs to Squaloidei'
- 'Squaliolus belongs to Scymnorhinidae'
- 'Squaloidei belongs to Tectospondyli'
- 'Squaloraja [misspelled as Squaloraia] belongs to Squaloraiidae'
- 'Squalorajidae [misspelled as Squaloraiidae] belongs to Chimaeroidei'
- 'Squalraia belongs to Squatinidae'
- 'Squalus belongs to Squalidae'
- 'Squamipennes belongs to Percomorphi'
- 'Squatina belongs to Squatinidae'
- 'Squatinidae belongs to Squatinoidei'
- 'Squatinoidei belongs to Tectospondyli'
- 'Squatinoraja belongs to Rhinobatidae'
- 'Stegophthalami belongs to Arthrodira'
- 'Stegostoma belongs to Orectolobidae'
- 'Steinegeridae belongs to Bramiformes'
- 'Stemmatias belongs to Orodontidae'
- 'Stemmatodus belongs to Orodontidae'
- 'Stenognathus belongs to Dinichthyidae'
- 'Stenopterodus belongs to Cochliodontidae'
- 'Stenosteus belongs to Selenosteidae'
- 'Stephanoberycidae belongs to Xenoberyces'
- 'Sternoptychidae belongs to Enchodontoidei'
- 'Stethacanthus belongs to Janassidae'
- 'Stichacanthus [misspelled as Stichaeacanthus] belongs to Janassidae'
- 'Stichaeidae belongs to Blenniiformes'
- 'Stoasodon belongs to Myliobatidae'
- 'Stomiatidae belongs to Stomiatioidei'
- 'Stomiatioidei belongs to Isospondyli'
- 'Stratodontidae belongs to Hoplopleuri'
- 'Streblodus belongs to Cochliodontidae'
- 'Strigilina belongs to Janassidae'
- 'Stromateidae belongs to Stromateiformes'
- 'Stromateiformes belongs to Rhegnopteri'
- 'Strophodus belongs to Heterodontidae'
- 'Stylephoridae belongs to Atelaxia'
- 'Stylophthalmidae belongs to Enchodontoidei'
- 'Styptobasis belongs to Cladodontidae'
- 'Styracodus belongs to Heterodontidae'
- 'Symbranchia belongs to Teleostei'
- 'Symmorium belongs to Cladodontidae'
- 'Sympterygia belongs to Rajidae'
- 'Synanceiidae [misspelled as Synancejidae] belongs to Scorpaeniformes'
- 'Synaphobranchidae belongs to Anguilloidei'
- 'Synapturidae belongs to Heterosomata'
- 'Synbranchidae belongs to Holostomi'
- 'Synchismus belongs to Orectolobidae'
- 'Synchridae belongs to Cottiformes'
- 'Synechodus belongs to Heterodontidae'
- 'Synentognathi belongs to Ostariophysi'
- 'Syngnathidae belongs to Lophobranchii'
- 'Synodontidae belongs to Iniomi'
- 'Syrrhina belongs to Rhinobatidae'
- 'Taeniodus belongs to Cochliodontidae'
- 'Taeniosomi belongs to Allotriognathi'
- 'Taeniura belongs to Dasyatidae'
- 'Tamiobatidae belongs to Janassides'
- 'Tamiobatis belongs to Tamiobatidae'
- 'Tanaodus belongs to Janassidae'
- 'Tarrasiidae belongs to Actinistia'
- 'Tarsistes belongs to Rhinobatidae'
- 'Tectospondyli was reranked as a order and belongs to Elasmobranchii'
- 'Teleostei was reranked as a superorder and belongs to Actinopteri'
- 'Temera belongs to Torpedinidae'
- 'Temnothoraci belongs to Arthrodira'
- 'Tetragonuridae belongs to Stromateiformes'
- 'Tetraodontidae belongs to Gymnodontes'
- 'Tetrapleurodon belongs to Petromyzonidae'
- 'Tetronarce [misspelled as Tetranarce] belongs to Torpedinidae'
- 'Tetronarcine belongs to Torpedinidae'
- 'Tetroras belongs to Cetorhinidae'
- 'Teuthidae belongs to Amphacanthi'
- 'Thalassoklephtes belongs to Pentanchidae'
- 'Thalassorhinus belongs to Galeidae'
- 'Thaumatacanthus belongs to Heterodontidae'
- 'Thectodus belongs to Heterodontidae'
- 'Thelodontidae belongs to Heterostraci'
- 'Thelodus belongs to Thelodontidae'
- 'Thelolepis belongs to Thelodontidae'
- 'Theraponidae belongs to Kurtiformes'
- 'Thoracodus belongs to Janassidae'
- 'Thoracostei belongs to Acanthopterygii'
- 'Thrinacodus belongs to Xenacanthidae'
- 'Thryptodontidae belongs to Albuloidei'
- 'Thunnidae belongs to Scombriformes'
- 'Thyellina belongs to Scylliorhinidae'
- 'Thymallidae belongs to Salmonoidei'
- 'Thysanochilus belongs to Geotriidae'
- 'Titanichthyidae belongs to Arthrothoraci'
- 'Titanichthys belongs to Coccosteidae'
- 'Tolypaspis belongs to Pteraspidae'
- 'Tolypelepis belongs to Pteraspidae'
- 'Tomodus belongs to Cochliodontidae'
- 'Tomognathidae belongs to Enchodontoidei'
- 'Torpedinidae belongs to Narcaciontes'
- 'Torpedo belongs to Torpedinidae'
- 'Toxoprion belongs to Edestidae'
- 'Toxotidae belongs to Toxotiformes'
- 'Toxotiformes belongs to Squamipennes'
- 'Trachichthyidae belongs to Berycoidei'
- 'Trachinidae belongs to Trachiniformes'
- 'Trachipteridae belongs to Taeniosomi'
- 'Trachosteus belongs to Coccosteidae'
- 'Traquairia belongs to Acanthoessidae'
- 'Triacanthidae belongs to Sclerodermi'
- 'Triaenodon belongs to Galeidae'
- 'Triakis belongs to Galeidae'
- 'Trichiuridae belongs to Scombriformes'
- 'Trichodontidae belongs to Trichodontiformes'
- 'Trichodontiformes belongs to Rhegnopteri'
- 'Trichonotidae belongs to Percophidiformes'
- 'Triglidae belongs to Trigliformes'
- 'Trigliformes belongs to Cataphracti'
- 'Triglochis belongs to Carchariidae'
- 'Trigonodus belongs to Cochliodontidae'
- 'Triodontidae belongs to Gymnodontes'
- 'Triodus belongs to Xenacanthidae'
- 'Tristychius belongs to Heterodontidae'
- 'Tropidodus belongs to Heterodontidae'
- 'Trygon belongs to Dasyatidae'
- 'Trygonobatus belongs to Dasyatidae'
- 'Trygonoptera belongs to Dasyatidae'
- 'Trygonorhina belongs to Rhinobatidae'
- 'Trypauchenidae belongs to Gobioidea'
- 'Typhlonarke belongs to Torpedinidae'
- 'Typodus belongs to Mylostomidae'
- 'Umbridae belongs to Haplomi'
- 'Uranoscopidae belongs to Uranoscopiformes'
- 'Uranoscopiformes was reranked as a unranked clade and belongs to Jugulares'
- 'Uraptera belongs to Rajidae'
- 'Urenchelyidae belongs to Congroidei'
- 'Urobatis belongs to Dasyatidae'
- 'Urogymnus belongs to Dasyatidae'
- 'Urolophus belongs to Dasyatidae'
- 'Uronemidae belongs to Sirenoidei'
- 'Urosphenidae belongs to Aulostomi'
- 'Urotrygon belongs to Dasyatidae'
- 'Uroxis belongs to Dasyatidae'
- 'Vaticinodus belongs to Cochliodontidae'
- 'Velasia belongs to Geotriidae'
- 'Veliferidae belongs to Histichthyes'
- 'Venustodus belongs to Cochliodontidae'
- 'Verilidae belongs to Kurtiformes'
- 'Vulpecula belongs to Alopiidae'
- 'Wodnika belongs to Heterodontidae'
- 'Xenacanthidae belongs to Ichthyotomi'
- 'Xenacanthus belongs to Xenacanthidae'
- 'Xenarchi belongs to Ostariophysi'
- 'Xenesthidae belongs to Synentognathi'
- 'Xenichthyidae belongs to Kurtiformes'
- 'Xenoberyces belongs to Acanthopterygii'
- 'Xenocephalidae belongs to Blenniiformes'
- 'Xenocongridae belongs to Congroidei'
- 'Xenodolamia belongs to Lamnidae'
- 'Xenodus belongs to Cochliodontidae'
- 'Xenomi belongs to Ostariophysi'
- 'Xenopterygii belongs to Teleostei'
- 'Xiphiidae belongs to Xiphiiformes'
- 'Xiphiiformes belongs to Percomorphi'
- 'Xiphiorhynchinae was reranked as the family Xiphiorhynchidae and belongs to Xiphiiformes'
- 'Xiphiostomidae belongs to Heterognathi'
- 'Xiphisternidae belongs to Blenniiformes'
- 'Xiphodolamia belongs to Carchariidae'
- 'Xystracanthus belongs to Janassidae'
- 'Xystrodus belongs to Cochliodontidae'
- 'Yarra belongs to Geotriidae'
- 'Zameus belongs to Squalidae'
- 'Zanclidae belongs to Zancliformes'
- 'Zancliformes belongs to Squamipennes'
- 'Zaniolepidae belongs to Hexagrammiformes'
- 'Zanobatus belongs to Platyrhinidae'
- 'Zaproridae belongs to Bathymasteriformes'
- 'Zapteryx belongs to Rhinobatidae'
- 'Zeidae belongs to Zeoidei'
- 'Zeoidei belongs to Acanthopterygii'
- 'Zoarcidae belongs to Zoarciformes'
- 'Zoarciformes belongs to Jugulares'
- 'Zygaena belongs to Sphyrnidae'
- 'Zygobatis belongs to Rhinopteridae'