Opinions from G. Henningsmoen 1953
- 'Acronotellidae belongs to Beyrichiacea'
- 'Aparchitidae belongs to Beyrichiacea'
- 'Beyrichia dissecta is recombined as Kiesowia dissecta' according to Krause 1892
- 'Beyrichia dissecta is recombined as Kiesowia dissecta'
- 'Beyrichia plicatula is recombined as Tetradella plicatula' according to Krause 1892
- 'Beyrichia plicatula is recombined as Tetradella plicatula'
- 'Beyrichia quadrilirata is recombined as Tetradella quadrilirata'
- 'Beyrichia strangulata is recombined as Primitia strangulata'
- 'Beyrichiacea belongs to Paleocopa'
- 'Biflabellum tenerum is recombined as Opikium tenerum'
- 'Bolbina belongs to Sigmoopsiinae'
- 'Bolbina minor belongs to Bolbina' according to Krause 1892
- 'Bolbina tuberculata belongs to Bolbina'
- 'Bollia belongs to Bolliinae'
- 'Bollia accentuata belongs to Bollia'
- 'Bollia duplex belongs to Bollia' according to Krause 1892
- 'Bollia ornata is recombined as Bolbina ornata'
- 'Bollia uniflexa belongs to Bollia' according to Jones and Holl 1886
- 'Bolliinae belongs to Drepanellidae'
- 'Chilobolbina belongs to Primitiidae'
- 'Chilobolbina jonesiana belongs to Chilobolbina' according to Schmidt 1941
- 'Ctenobolbina rara is recombined as Primitiella rara' according to Troedsson 1918
- 'Ctenobolbina rara is recombined as Primitiella rara'
- 'Drepanellidae belongs to Beyrichiacea'
- 'Eridoconcha belongs to Eridoconchidae'
- 'Euprimitiinae belongs to Eurychilinidae'
- 'Eurychilina estonula is recombined as Laccochilina estonula'
- 'Eurychilinidae belongs to Beyrichiacea'
- 'Eurychilininae belongs to Eurychilinidae'
- 'Isochilina frequens is recombined as Opikella frequens'
- 'Kiesowia belongs to Sigmoopsiinae'
- 'Laccochilina belongs to Eurychilinidae'
- 'Laccochilina tarda belongs to Laccochilina'
- 'Leperditia bivertex is recombined as Pseudulrichia bivertex'
- 'Leperditia praelonga is recombined as Macronotella praelonga'
- 'Macronotella belongs to Aparchitidae'
- 'Macronotella scofieldi belongs to Macronotella' according to Ulrich 1894
- 'Monoceratella belongs to Acronotellidae'
- 'Monoceratella bos belongs to Monoceratella'
- 'Monoceratella teres belongs to Monoceratella' according to Teichert 1937
- 'Opikella belongs to Eurychilinidae'
- 'Opikella tvaerensis belongs to Opikella' according to Thorslund 1940
- 'Opikium belongs to Piretellinae'
- 'Opikium porkuniensis belongs to Opikium'
- 'Piretellinae belongs to Tetradellidae'
- 'Platybolbina belongs to Eurychilininae'
- 'Platybolbina tiara belongs to Platybolbina'
- 'Primitia belongs to Primitiidae'
- 'Primitia dentifera is recombined as Chilobolbina dentifera'
- 'Primitia distans is recombined as Platybolbina distans'
- 'Primitia elongata is recombined as Platybolbina elongata' according to Krause 1891
- 'Primitia elongata is recombined as Platybolbina elongata'
- 'Primitia osloensis belongs to Primitia'
- 'Primitia plana is recombined as Platybolbina plana' according to Krause 1889
- 'Primitia plana is recombined as Platybolbina plana'
- 'Primitia umbonata is recombined as Platybolbina umbonata'
- 'Primitiella belongs to Euprimitiinae'
- 'Primitiella constricta belongs to Primitiella' according to Ulrich 1894
- 'Primitiella umbilicata is recombined as Opikella umbilicata'
- 'Primitiidae belongs to Beyrichiacea'
- 'Pseudulrichia belongs to Bolliinae'
- 'Pseudulrichia norvegica belongs to Pseudulrichia'
- 'Sigmobolbina belongs to Sigmoopsiinae'
- 'Sigmoopsiidae belongs to Beyrichiacea'
- 'Sigmoopsiidae was reranked as the subfamily Sigmoopsiinae and belongs to Sigmoopsiidae'
- 'Tetradella belongs to Tetradellinae'
- 'Tetradellinae belongs to Tetradellidae'