Opinions from W. I. Mitchell 1977
- 'Acanthocrania belongs to Craniidae'
- 'Acrotretacea belongs to Acrotretidina'
- 'Acrotretida belongs to Inarticulata'
- 'Acrotretidae belongs to Acrotretacea'
- 'Acrotretidina belongs to Acrotretida'
- 'Actinomena belongs to Strophomeninae'
- 'Aegiria belongs to Aegiromeninae'
- 'Aegiria norvegica belongs to Aegiria' according to Opik 1933
- 'Aegiromeninae belongs to Sowerbyellidae'
- 'Ahtiella portlocki belongs to Ahtiella' according to Reed 1952
- 'Ahtiella portlocki is recombined as Brachyprion portlocki'
- 'Ancistrorhynchidae belongs to Rhynchonellacea'
- 'Anisopleurella belongs to Sowerbyellidae'
- 'Anisopleurella tricostellata belongs to Anisopleurella' according to Cooper 1956
- 'Anomia biloba is recombined as Dicoelosia biloba'
- 'Anomites rhomboidalis is recombined as Leptaena rhomboidalis' according to Reed 1952
- 'Anoptambonites belongs to Leptellininae'
- 'Atelelasma belongs to Atelelasmatinae'
- 'Atelelasma perfectum belongs to Atelelasma' according to Cooper 1956
- 'Atelelasmatinae belongs to Clitambonitidae'
- 'Athyridacea belongs to Athyrididina'
- 'Athyrididina belongs to Spiriferida'
- 'Athyris headi is recombined as Catazyga headi'
- 'Atrypa congesta is recombined as Hyattidina congesta'
- 'Atrypa exigua is recombined as Protozyga exigua'
- 'Atrypa extans is recombined as Triplesia extans'
- 'Atrypa nitens is recombined as Hisingerella nitens'
- 'Atrypacea belongs to Atrypidina'
- 'Atrypidae belongs to Atrypacea'
- 'Atrypidina belongs to Spiriferida'
- 'Barbarorthis foramenifera belongs to Barbarorthis' according to Opik 1934
- 'Bilobia belongs to Leptestiinae'
- 'Bimuria belongs to Bimuriidae'
- 'Bimuria superba belongs to Bimuria' according to Ulrich and Cooper 1942
- 'Bimuriidae belongs to Strophomenida'
- 'Brachyprion belongs to Stropheodontinae'
- 'Camerella belongs to Camerellinae'
- 'Camerella volborthi belongs to Camerella' according to Billings 1859
- 'Camerellidae belongs to Syntrophiidina'
- 'Camerellinae belongs to Camerellidae'
- 'Campylorthis belongs to Plaesiomyinae'
- 'Carinatininae belongs to Atrypidae'
- 'Catazyga belongs to Zygospirinae'
- 'Catazyga anticostiensis belongs to Catazyga' according to Billings 1862
- 'Christiania belongs to Christianiidae'
- 'Christiania perrugata elongata belongs to Christiania perrugata'
- 'Christiania portlocki belongs to Christiania'
- 'Christianiidae belongs to Strophomenacea'
- 'Clitambonitacea belongs to Clitambonitidina'
- 'Clitambonitidae belongs to Clitambonitacea'
- 'Clitambonitidina belongs to Orthida'
- 'Clitambonitinae belongs to Clitambonitidae'
- 'Colaptomena belongs to Oepikinae'
- 'Crania spiculata is recombined as Acanthocrania spiculata'
- 'Craniacea belongs to Craniidina'
- 'Craniella meduanensis is recombined as Petrocrania meduanensis'
- 'Craniidae belongs to Craniacea'
- 'Craniidina belongs to Lingulida'
- 'Craniops pararia is recombined as Paracraniops pararia'
- 'Craniopsidae belongs to Lingulacea'
- 'Cremnorthidae belongs to Orthida'
- 'Cremnorthinae belongs to Cremnorthidae'
- 'Cremnorthis belongs to Cremnorthinae'
- 'Cremnorthis parva belongs to Cremnorthis' according to Williams 1963
- 'Cyclospira belongs to Cyclospirinae'
- 'Cyclospira diversa is recombined as Protozyga diversa' according to Reed 1917
- 'Cyclospira diversa is recombined as Protozyga diversa'
- 'Cyclospira nana belongs to Cyclospira' according to Davidson 1869
- 'Cyclospirinae belongs to Dayiidae'
- 'Cyphomena belongs to Leptaenidae'
- 'Cyphomena homostriata indicissa belongs to Cyphomena homostriata' according to Williams 1962
- 'Cyrtonotella belongs to Orthinae'
- 'Cyrtonotella virginiensis belongs to Cyrtonotella' according to Butts 1942
- 'Dactylogonia belongs to Leptaenidae'
- 'Dactylogonia geniculata belongs to Dactylogonia' according to Ulrich and Cooper 1942
- 'Dalmanella belongs to Dalmanellidae'
- 'Dalmanella sculpta belongs to Dalmanella' according to Cooper 1956
- 'Dalmanella testudinaria transversa belongs to Dalmanella testudinaria'
- 'Dalmanellidae belongs to Orthida'
- 'Dayiidae belongs to Daylacea'
- 'Daylacea belongs to Atrypidina'
- 'Diambonia is a subjective synonym of Leangella'
- 'Dicoelosia belongs to Dicoelosiidae'
- 'Dicoelosia simulata belongs to Dicoelosia'
- 'Dicoelosiidae belongs to Orthida'
- 'Diplonorthis belongs to Orthinae'
- 'Diplonorthis portlocki belongs to Diplonorthis'
- 'Discinacea belongs to Lingulida'
- 'Discinidae belongs to Discinacea'
- 'Doleroides belongs to Plectorthinae'
- 'Doleroides winchelli belongs to Doleroides' according to Cooper 1956
- 'Dolerorthidae belongs to Orthacea'
- 'Dolerorthinae belongs to Dolerorthidae'
- 'Dolerorthis belongs to Dolerorthinae'
- 'Draboviinae belongs to Schizophoriidae'
- 'Drepanorhyncha belongs to Ancistrorhynchidae'
- 'Enteletacea belongs to Orthida'
- 'Eochonetes belongs to Sowerbyellidae'
- 'Eochonetes celticus belongs to Eochonetes'
- 'Eodinobolus belongs to Trimerellidae'
- 'Eodinobolus balclatchiensis belongs to Eodinobolus' according to Reed 1917
- 'Eoplectodonta belongs to Sowerbyellidae'
- 'Plectatrypa is a subjective synonym of Plectatrypa'
- 'Eostropheodonta belongs to Stropheodontinae'
- 'Epacroplecia belongs to Triplesiidae'
- 'Eremotrema belongs to Paurorthidae'
- 'Eremotrema biconvexum belongs to Eremotrema' according to Cooper 1956
- 'Eremotrema paucicostellatum belongs to Eremotrema' according to Mitchell 1977
- 'Eridorthis belongs to Glyptorthinae'
- 'Fascifera belongs to Draboviinae'
- 'Fascifera subcarinata belongs to Fascifera' according to Ulrich and Cooper 1942
- 'Glossella belongs to Glossellinae'
- 'Glossella papillosa belongs to Glossella'
- 'Glossellinae belongs to Obolidae'
- 'Glyptomena belongs to Glyptomeninae'
- 'Glyptomeninae belongs to Strophomenidae'
- 'Glyptorthinae belongs to Dolerorthidae'
- 'Glyptorthis belongs to Glyptorthinae'
- 'Glyptorthis concinnula belongs to Glyptorthis'
- 'Glyptorthis maritima belongs to Glyptorthis' according to Wright 1964
- 'Gonambonitacea belongs to Clitambonitidina'
- 'Gonambonites panderi is recombined as Kullervo panderi'
- 'Gunnarella belongs to Strophomeninae'
- 'Hesperorthinae belongs to Dolerorthidae'
- 'Hindellinae belongs to Meristellidae'
- 'Hirnantia belongs to Draboviinae'
- 'Hisingerella belongs to Linnarssoniinae'
- 'Hyattidina belongs to Hindellinae'
- 'Hyattidina plicata belongs to Hyattidina'
- 'Hypsiptycha belongs to Rhynchotrematinae'
- 'Isophragma belongs to Isopiiragmatinae'
- 'Isopiiragmatinae belongs to Leptestiidae'
- 'Kiaeromena belongs to Leptaenidae'
- 'Kjerulfina belongs to Rafinesquininae'
- 'Kjerulfina polycyma belongs to Kjerulfina' according to Bancroft 1929
- 'Kjerulfina trigonalis belongs to Kjerulfina' according to Bancroft 1929
- 'Kullervo belongs to Kullervoidae'
- 'Kullervoidae belongs to Gonambonitacea'
- 'Leangella belongs to Leptestiinae'
- 'Leangella discuneata belongs to Leangella'
- 'Leptaena belongs to Leptaenidae'
- 'Leptaena etheridgei is recombined as Bilobia etheridgei'
- 'Leptaena grayae is recombined as Anoptambonites grayae'
- 'Leptaena kjerulfi is recombined as Kiaeromena kjerulfi'
- 'Leptaena minuta belongs to Leptaena' according to Kiaer 1926
- 'Leptaena sericea is recombined as Sowerbyella (Sowerbyella) sericea'
- 'Leptaena subquadrata is recombined as Christiania subquadrata'
- 'Leptaenidae belongs to Strophomenacea'
- 'Leptaenopoma is a subjective synonym of Leptaena'
- 'Leptellina belongs to Leptellininae'
- 'Leptellinidae belongs to Plectambonitacea'
- 'Leptellininae belongs to Leptellinidae'
- 'Leptestiidae belongs to Plectambonitacea'
- 'Leptestiina belongs to Leptestiinae'
- 'Leptestiina prantli belongs to Leptestiina' according to Havlicek 1952
- 'Lingulella brevis is a subjective synonym of Lingulella brevis'
- 'Lingula attenuata is recombined as Lingulella brevis' according to Portlock 1843
- 'Lingulella brevis is a subjective synonym of Lingulella brevis'
- 'Lingulacea belongs to Lingulida'
- 'Lingulasma quaestor is recombined as Lingulella quaestor' according to Reed 1917
- 'Lingulella quaestor is a subjective synonym of Lingulella quaestor' according to Portlock 1843
- 'Lingulella quaestor is a subjective synonym of Lingulella quaestor'
- 'Lingulella belongs to Lingulellinae'
- 'Lingulellinae belongs to Obolidae'
- 'Lingulida belongs to Inarticulata'
- 'Linnarssoniinae belongs to Acrotretidae'
- 'Liostrophia belongs to Parastrophinidae'
- 'Liostrophia glabra belongs to Liostrophia' according to Cooper and Kindle 1936
- 'Lordorthis belongs to Hesperorthinae'
- 'Luhaia belongs to Strophomeninae'
- 'Luhaia vardi belongs to Luhaia' according to Roomusoks 1956
- 'Meristellidae belongs to Athyridacea'
- 'Mimella belongs to Plectorthinae'
- 'Mjoesina belongs to Glyptomeninae'
- 'Mjoesina moorei belongs to Mjoesina'
- 'Nicolella belongs to Productorthinae'
- 'Obolellina magnifica is recombined as Eodinobolus magnifica'
- 'Obolidae belongs to Lingulacea'
- 'Oepikinae belongs to Strophomenidae'
- 'Onychotreta belongs to Triplesiidae'
- 'Onychotreta mesleri belongs to Onychotreta' according to Ulrich and Cooper 1936
- 'Opikina is corrected as Oepikina and belongs to Oepikinae'
- 'Orbicula elliptica is recombined as Schizotreta elliptica'
- 'Orbicula forbesi is recombined as Orbiculoidea forbesi'
- 'Orbiculoidea belongs to Orbiculoideinae'
- 'Orbiculoidea armstrongi belongs to Orbiculoidea' according to Reed 1952
- 'Orbiculoidea stincharensis belongs to Orbiculoidea' according to Reed 1917
- 'Orbiculoidea stincharensis belongs to Orbiculoidea'
- 'Orbiculoideinae belongs to Discinidae'
- 'Origostrophia belongs to Stropheodontinae'
- 'Origostrophia fragilis belongs to Origostrophia'
- 'Orthacea belongs to Orthina'
- 'Orthambonites belongs to Orthinae'
- 'Orthambonites parva is recombined as Paurorthis parva'
- 'Orthambonites transversa belongs to Orthambonites' according to Dall 1877
- 'Orthida belongs to Inarticulata'
- 'Orthidae belongs to Orthacea'
- 'Orthina belongs to Orthida'
- 'Orthis actoniae is recombined as Nicolella actoniae'
- 'Orthis bilobata belongs to Orthis' according to Portlock 1843
- 'Orthis bisulcata is recombined as Cyclospira bisulcata'
- 'Orthis cancellata is recombined as Strophomena cancellata'
- 'Orthis corrugata is replaced by Stropheodonta corrugatella' according to Davidson 1871
- 'Orthis discreta is recombined as Campylorthis discreta' according to Reed 1952
- 'Campylorthis discreta is a subjective synonym of Campylorthis discreta'
- 'Orthis expansa concentrica is recombined as Colaptomena concentrica'
- 'Orthis fallax is recombined as Schizophorella fallax'
- 'Orthis gibbosa is recombined as Doleroides gibbosa'
- 'Campylorthis grandis is a subjective synonym of Campylorthis discreta'
- 'Orthis intercostata is recombined as Dolerorthis intercostata'
- 'Orthis lunata is recombined as Mimella rotunda' according to Mitchell 1977
- 'Mimella rotunda is a subjective synonym of Mimella rotunda'
- 'Mimella rotunda is a subjective synonym of Mimella rotunda'
- 'Orthis playfairi is recombined as Orthambonites playfairi'
- 'Orthis rugifera is recombined as Colaptomena rugifera'
- 'Orthis scotica is recombined as Plectorthis scotica'
- 'Oxoplecia belongs to Triplesiidae'
- 'Oxoplecia calhouni belongs to Oxoplecia' according to Wilson 1913
- 'Pachyglossella belongs to Glossellinae'
- 'Palaeostrophomena belongs to Leptestiinae'
- 'Paracraniops belongs to Craniopsidae'
- 'Parastrophina belongs to Parastrophinidae'
- 'Parastrophinidae belongs to Syntrophiidina'
- 'Paterula belongs to Paterulidae'
- 'Paterula bohemica belongs to Paterula' according to Barrande 1879
- 'Paterulidae belongs to Lingulacea'
- 'Paucicrura belongs to Paurorthidae'
- 'Paucicrura cristifera belongs to Paucicrura' according to Cooper 1956
- 'Paurorthidae belongs to Orthida'
- 'Paurorthis belongs to Paurorthidae'
- 'Petrocrania belongs to Craniidae'
- 'Pionodema belongs to Draboviinae'
- 'Pionodema globosa is recombined as Mimella globosa'
- 'Plaesiomyidae belongs to Orthida'
- 'Plaesiomyinae belongs to Plaesiomyidae'
- 'Plaesiomys belongs to Plaesiomyinae'
- 'Plaesiomys porcata lata belongs to Plaesiomys porcata'
- 'Platymena belongs to Glyptomeninae'
- 'Platymena plana belongs to Platymena' according to Cooper 1956
- 'Platystrophia belongs to Platystrophinae'
- 'Platystrophinae belongs to Plectorthidae'
- 'Plectambonitacea belongs to Strophomenidina'
- 'Plectambonites ruralis is recombined as Sampo ruralis' according to Reed 1917
- 'Sampo ruralis is a subjective synonym of Sampo ruralis'
- 'Plectatrypa is corrected as Plectatrypa and belongs to Carinatininae'
- 'Plectatrypa hibernica belongs to Plectatrypa' according to Reed 1952
- 'Plectoglossa belongs to Glossellinae'
- 'Plectoglossa oklahomensis belongs to Plectoglossa'
- 'Plectorthidae belongs to Orthida'
- 'Plectorthinae belongs to Plectorthidae'
- 'Plectorthis belongs to Plectorthinae'
- 'Plectorthis nicklesi is recombined as Eridorthis nicklesi'
- 'Pomeromena belongs to Leptaenidae'
- 'Pomeromena transversa belongs to Pomeromena'
- 'Porambonites ottawaensis is recombined as Drepanorhyncha ottawaensis'
- 'Producta tenuicincta is recombined as Christiania tenuicincta' according to Reed 1952
- 'Productorthinae belongs to Orthidae'
- 'Protozyga belongs to Zygospirinae'
- 'Ptychoglyptus ambiguus is recombined as Sowerbyella (Rugosowerbyella) ambigua'
- 'Ptychopleurella belongs to Glyptorthinae'
- 'Rafinesquininae belongs to Strophomenidae'
- 'Rhactomena belongs to Leptaenidae'
- 'Rhactomena splendens belongs to Rhactomena'
- 'Rhynchonellacea belongs to Rhynchonellida'
- 'Rhynchotrema belongs to Rhynchotrematinae'
- 'Rhynchotrema plicata is corrected as Rhynchotrema plicatum and belongs to Rhynchotrema'
- 'Rhynchotrema simulatum is recombined as Rostricellula simulata' according to Reed 1952
- 'Rostricellula simulata is a subjective synonym of Rostricellula simulata'
- 'Rhynchotrematidae belongs to Rhynchonellacea'
- 'Rhynchotrematinae belongs to Rhynchotrematidae'
- 'Rostricellula belongs to Trigonorhynchiidae'
- 'Salopina belongs to Draboviinae'
- 'Salopina ordovicica belongs to Salopina'
- 'Sampo belongs to Leptellinidae'
- 'Sampo hiiuensis belongs to Sampo' according to Opik 1933
- 'Scaphorthis belongs to Plectorthinae'
- 'Schizophorella belongs to Plectorthinae'
- 'Schizophorella fallax fallax belongs to Schizophorella fallax' according to Salter 1846
- 'Schizophoriidae belongs to Enteletacea'
- 'Schizotreta belongs to Orbiculoideinae'
- 'Schizotreta corrugata belongs to Schizotreta' according to Cooper 1956
- 'Skenidiidae belongs to Orthida'
- 'Skenidioides belongs to Skenidiidae'
- 'Skenidioides billingsi belongs to Skenidioides' according to Schuchert and Cooper 1931
- 'Skenidioides elongatus belongs to Skenidioides' according to Cooper 1956
- 'Skenidioides greenhoughi belongs to Skenidioides' according to Reed 1917
- 'Sowerbyella belongs to Sowerbyellinae'
- 'Sowerbyella (Viruella) belongs to Sowerbyella' according to Roomusoks 1959
- 'Sowerbyella monilifera belongs to Sowerbyella'
- 'Sowerbyella precursor is recombined as Eoplectodonta precursor'
- 'Sowerbyellidae belongs to Strophomenida'
- 'Sowerbyellinae belongs to Sowerbyellidae'
- 'Sowerbyites belongs to Leptestiinae'
- 'Sowerbyites hibernicus belongs to Sowerbyites'
- 'Sowerbyites medioseptatus belongs to Sowerbyites' according to Teichert 1937
- 'Streptis belongs to Triplesiidae'
- 'Stropheodonta corrugatella is recombined as Gunnarella corrugatella'
- 'Stropheodontidae belongs to Strophomenida'
- 'Stropheodontinae belongs to Stropheodontidae'
- 'Strophomena belongs to Strophomeninae'
- 'Strophomena concava is recombined as Palaeostrophomena concava'
- 'Orthis corrugata is replaced by Stropheodonta corrugatella' according to Davidson 1871
- 'Strophomena corrugata is recombined as Gunnarella corrugata'
- 'Strophomena deflecta is recombined as Campylorthis deflecta'
- 'Strophomena norvegica lata belongs to Strophomena norvegica' according to Williams 1962
- 'Strophomena rugosa belongs to Strophomena' according to de Blainville 1825
- 'Strophomenacea belongs to Strophomenida'
- 'Strophomenida belongs to Articulata'
- 'Strophomenidae belongs to Strophomenacea'
- 'Strophomenidina belongs to Strophomenida'
- 'Strophomeninae belongs to Strophomenidae'
- 'Syntrophiidina belongs to Pentamerida'
- 'Taphrorthis belongs to Orthinae'
- 'Taphrorthis emarginata belongs to Taphrorthis' according to Cooper 1956
- 'Terebratula grayii is recombined as Streptis grayii'
- 'Terebratula imbricata is recombined as Plectatrypa imbricata'
- 'Terebratula semicircularis is recombined as Cyrtonotella semicircularis'
- 'Thaerodonta is a subjective synonym of Eoplectodonta'
- 'Titanambonites belongs to Leptestiinae'
- 'Titanambonites medius belongs to Titanambonites' according to Cooper 1956
- 'Trigonirhynchiidae [misspelled as Trigonorhynchiidae] belongs to Rhynchonellacea'
- 'Trimerellacea belongs to Lingulida'
- 'Trimerellidae belongs to Trimerellacea'
- 'Trimurellina belongs to Leptellininae'
- 'Trimurellina superba belongs to Trimurellina'
- 'Triplesia belongs to Triplesiidae'
- 'Triplesia grayiae is recombined as Epacroplecia grayiae'
- 'Triplesiacea belongs to Triplesiidina'
- 'Triplesiidae belongs to Triplesiacea'
- 'Triplesiidina belongs to Orthida'
- 'Tyronella belongs to Tyronellidae'
- 'Tyronella killeyensis belongs to Tyronella'
- 'Tyronellidae belongs to Orthida'
- 'Vellamo belongs to Clitambonitinae'
- 'Zygospirinae belongs to Atrypidae'