Opinions from A. G. Unklesbay and R. S. Young 1956
- 'Albertoceras belongs to Ellesmeroceratidae'
- 'Albertoceras staufferi belongs to Albertoceras'
- 'Albertoceras staufferi belongs to Albertoceras' according to Ulrich et al. 1944
- 'Anguloceras belongs to Ellesmeroceratidae'
- 'Anguloceras depressum belongs to Anguloceras'
- 'Anguloceras ovatum belongs to Anguloceras'
- 'Anguloceras rotundum belongs to Anguloceras'
- 'Baltoceratidae belongs to Ellesmeroceratida'
- 'Bassleroceras belongs to Bassleroceratidae'
- 'Bassleroceras bridgei belongs to Bassleroceras' according to Ulrich et al. 1943
- 'Chepuloceras belongs to Bassleroceratidae'
- 'Chepuloceras inelegans belongs to Chepuloceras'
- 'Clelandoceras belongs to Ellesmeroceratidae'
- 'Clelandoceras elongatum belongs to Clelandoceras'
- 'Clelandoceras elongatum belongs to Clelandoceras' according to Ulrich et al. 1944
- 'Ectenoceras belongs to Ellesmeroceratidae'
- 'Ectenoceras chepultepecense belongs to Ectenoceras' according to Ulrich et al. 1943
- 'Ectenoceras chepultepecense belongs to Ectenoceras'
- 'Ectenoceras compressum belongs to Ectenoceras' according to Ulrich et al. 1943
- 'Ectenoceras compressum belongs to Ectenoceras'
- 'Ectenoceras exile belongs to Ectenoceras' according to Ulrich et al. 1943
- 'Ectenoceras exile belongs to Ectenoceras'
- 'Ectenoceras longum belongs to Ectenoceras' according to Ulrich et al. 1943
- 'Ectenoceras longum belongs to Ectenoceras'
- 'Ellesmeroceratida belongs to Nautiloidea'
- 'Levisoceras belongs to Ellesmeroceratidae'
- 'Levisoceras ellipticum belongs to Levisoceras' according to Ulrich et al. 1943
- 'Levisoceras ellipticum belongs to Levisoceras'
- 'Levisoceras instabile belongs to Levisoceras' according to Ulrich et al. 1943
- 'Levisoceras instabile belongs to Levisoceras'
- 'Levisoceras transitum belongs to Levisoceras' according to Ulrich et al. 1943
- 'Levisoceras transitum belongs to Levisoceras'
- 'Pachendoceras belongs to Baltoceratidae'
- 'Pachendoceras brevicameratum belongs to Pachendoceras'
- 'Pachendoceras confertum belongs to Pachendoceras' according to Ulrich et al. 1944
- 'Pachendoceras confertum belongs to Pachendoceras'
- 'Pachendoceras parvum belongs to Pachendoceras'
- 'Shelbyoceras belongs to Ellesmeroceratidae'
- 'Shelbyoceras bessemerense belongs to Shelbyoceras'
- 'Woosteroceras belongs to Cyclostomiceratidae'
- 'Woosteroceras chepultepecense belongs to Woosteroceras'