Opinions from H. J. Howe 1988
- 'Atrypa dentata belongs to Atrypa' according to Hall 1847
- 'Atrypidae belongs to Atrypacea'
- 'Austinella belongs to Plaesiomyidae'
- 'Dalmanellidae belongs to Enteletoidea'
- 'Diceromyonia belongs to Dalmanellidae'
- 'Dinorthis (Retrorsirostra) was reranked as Retrorsirostra and belongs to Plaesiomyidae'
- 'Dolerorthidae [misspelled as Dolerothidae] belongs to Orthacea'
- 'Glyptorthinae belongs to Dolerothidae'
- 'Glyptorthis belongs to Glyptorthinae'
- 'Hebertella belongs to Plectorthidae'
- 'Hebertella (Glyptorthis) insculpta maquoketensis is recombined as Glyptorthis insculpta maquoketensis'
- 'Leptaena recedens is recombined as Thaerodonta recedens'
- 'Onniella belongs to Dalmanellidae'
- 'Onniella quadrata is recombined as Paucicrura quadrata'
- 'Orthis kankakensis is recombined as Austinella kankakensis'
- 'Orthis proavita is recombined as Dinorthis proavitus' according to Greger and Born 1936
- 'Orthis proavita is recombined as Plaesiomys proavita'
- 'Paucicrura belongs to Dalmanellidae'
- 'Paucicrura oklahomensis is a subjective synonym of Paucicrura quadrata'
- 'Pionodema belongs to Dalmanellidae'
- 'Pionodema aberstadti belongs to Pionodema'
- 'Plaesiomyidae belongs to Orthacea'
- 'Plaesiomys belongs to Plaesiomyidae'
- 'Plaesiomys bellistriatus belongs to Plaesiomys'
- 'Platystrophia belongs to Plectorthidae'
- 'Plectambonitacea belongs to Articulata'
- 'Plectorthidae belongs to Orthacea'
- 'Rafinesquina belongs to Rafinesquininae'
- 'Rafinesquininae belongs to Strophomenidae'
- 'Rhynchonella argenturbica is recombined as Rhynchotrema argenturbicum' according to Cooper 1944
- 'Sowerbyellidae belongs to Plectambonitacea'
- 'Strophomena belongs to Strophomeninae'
- 'Strophomenidae belongs to Strophomenacea'
- 'Strophomeninae belongs to Strophomenidae'
- 'Tetraphalerella belongs to Strophomeninae'
- 'Thaerodonta belongs to Sowerbyellidae'
- 'Zygospira belongs to Zygospirinae'
- 'Zygospirinae belongs to Atrypidae'