Opinions from D.H. Evans 2011
- 'Allopiloceras belongs to Piloceratidae'
- 'Allopiloceras bealachense belongs to Allopiloceras'
- 'Allopiloceras lonachonense belongs to Allopiloceras'
- 'Allopiloceras tennesseense belongs to Allopiloceras' according to Ulrich and Foerste 1936
- 'Allotrioceratidae belongs to Endocerida'
- 'Aphetoceras belongs to Estonioceratidae'
- 'Apocrinoceras belongs to Apocrinoceratidae'
- 'Apocrinoceras talboti belongs to Apocrinoceras' according to Teichert and Glenister 1954
- 'Apocrinoceratidae belongs to Discosorida'
- 'Augeoceras belongs to Piloceratidae'
- 'Augeoceras gracile belongs to Augeoceras'
- 'Baltoceratidae belongs to Orthocerida'
- 'Bassleroceras belongs to Ellesmeroceratidae'
- 'Bisonoceras belongs to Piloceratidae'
- 'Buttsoceras belongs to Troedssonellidae'
- 'Cassinoceras belongs to Piloceratidae'
- 'Cassinoceras arkansasense is recombined as Expandocassinoceras arkansasense'
- 'Cassinoceras grande is recombined as Expandocassinoceras grande'
- 'Chihlioceratidae belongs to Endocerida'
- 'Clitendoceras belongs to Proterocameroceratidae'
- 'Cotteroceras belongs to Proterocameroceratidae'
- 'Cyptendoceras belongs to Protocycloceratidae'
- 'Cyrtoceras metellus is recombined as Dyscritoceras metellus'
- 'Dakeoceras belongs to Ellesmeroceratidae'
- 'Deltoceras belongs to Estonioceratidae'
- 'Deltoceratidae is a subjective synonym of Estonioceratidae'
- 'Diaphoroceras belongs to Ellesmeroceratidae'
- 'Discosorida belongs to Nautiloidea'
- 'Dissidocerida belongs to Orthoceratoidea'
- 'Dyscritoceras belongs to Ellesmeroceratidae'
- 'Ectocycloceras belongs to Rudolfoceratidae'
- 'Ellesmeroceras belongs to Ellesmeroceratidae'
- 'Ellesmeroceras (Metaellesmeroceras) belongs to Ellesmeroceras' according to Flower 1956
- 'Ellesmeroceras (Metaellesmeroceras) is an invalid subgroup of Ellesmeroceras'
- 'Ellesmeroceratida is corrected as Ellesmerocerida and belongs to Nautiloidea'
- 'Ellesmeroceratidae belongs to Ellesmerocerida'
- 'Endocerida belongs to Nautiloidea'
- 'Escharendoceras belongs to Proterocameroceratidae'
- 'Escharendoceras eccentricum belongs to Escharendoceras' according to Flower 1956
- 'Estonioceratidae belongs to Tarphycerida'
- 'Eurystomites belongs to Tarphyceratidae'
- 'Expandocassinoceras belongs to Piloceratidae'
- 'Manchuroceratidae belongs to Endocerida'
- 'Nautiloidea belongs to Cephalopoda'
- 'Nautilus kelloggi is recombined as Eurystomites kelloggi'
- 'Nautilus pompanium is recombined as Pionoceras pompanium'
- 'Orthoceras adamsi is recombined as Buttsoceras adamsi'
- 'Orthoceras baculoides is recombined as Proterocameroceras baculoides'
- 'Protocycloceras becki is a subjective synonym of Protocycloceras lamarcki'
- 'Orthoceras brainerdi is recombined as Proterocameroceras brainerdi'
- 'Orthoceras cataline is recombined as Ectocycloceras cataline'
- 'Orthoceras durinum is recombined as Proterocameroceras durinum'
- 'Orthoceras lamarcki is recombined as Protocycloceras lamarcki'
- 'Protocycloceras lamarcki is a subjective synonym of Protocycloceras lamarcki'
- 'Protocycloceras lamarcki is a subjective synonym of Protocycloceras lamarcki'
- 'Orthoceras perseus is recombined as Bassleroceras perseus'
- 'Orthoceras pertinens is recombined as Rhabdiferoceras pertinens' according to Blake 1882
- 'Orthoceras pertinens is recombined as Rhabdiferoceras pertinens'
- 'Orthocerida belongs to Orthoceratoidea'
- 'Phragmosiphon belongs to Proterocameroceratidae'
- 'Phragmosiphon septiferum belongs to Phragmosiphon' according to Flower 1956
- 'Phragmosiphon septiferum belongs to Phragmosiphon' according to Flower 1956
- 'Piloceras belongs to Piloceratidae'
- 'Piloceras hornei is recombined as Bisonoceras hornei' according to Ulrich et al. 1943
- 'Piloceras hornei is recombined as Bisonoceras hornei'
- 'Piloceras invaginatum belongs to Piloceras' according to Salter in Murchison 1859
- 'Cassinoceras wortheni is a subjective synonym of Cassinoceras wortheni'
- 'Piloceras wortheni is recombined as Cassinoceras wortheni'
- 'Piloceratidae belongs to Endocerida'
- 'Pionoceras belongs to Tarphyceratidae'
- 'Pionoceras peachi belongs to Pionoceras'
- 'Platysiphon belongs to Proterocameroceratidae'
- 'Platysiphon expansum belongs to Platysiphon' according to Flower 1956
- 'Proterocameroceras belongs to Proterocameroceratidae'
- 'Proterocameroceratidae belongs to Endocerida'
- 'Protocycloceras belongs to Protocycloceratidae'
- 'Protocycloceras affine belongs to Protocycloceras' according to Ulrich et al 1944
- 'Protocycloceratidae belongs to Orthoceratoidea'
- 'Rhabdiferoceras belongs to Baltoceratidae'
- 'Rhabdocycloceratidae is a subjective synonym of Protocycloceratidae'
- 'Rudolfoceras levisense is recombined as Ectocycloceras levisense'
- 'Rudolfoceratidae belongs to Ellesmerocerida'
- 'Stenosiphon belongs to Proterocameroceratidae'
- 'Stenosiphon sandoi belongs to Stenosiphon' according to Flower 1956
- 'Tajaroceras belongs to Troedssonellidae'
- 'Tarphyceras belongs to Tarphyceratidae'
- 'Tarphyceratida is corrected as Tarphycerida and belongs to Nautiloidea'
- 'Tarphyceratidae belongs to Tarphycerida'
- 'Trocholitidae belongs to Tarphycerida'
- 'Trocholitoceras belongs to Trocholitidae'
- 'Troedssonellidae belongs to Dissidocerida'