Opinions from R. H. Flower 1962
- 'Allumettoceras belongs to Allumettoceratidae'
- 'Allumettoceratidae belongs to Michelinoceratida'
- 'Bactritidae belongs to Michelinoceratida'
- 'Buttsoceras atticus belongs to Buttsoceras' according to Billings 1865
- 'Choanoceras belongs to Choanoceratidae'
- 'Choanoceratidae belongs to Michelinoceratida'
- 'Clinoceras belongs to Clinoceratidae'
- 'Clinoceratidae belongs to Michelinoceratida'
- 'Cycloceras belongs to Michelinoceratida'
- 'Cycloceratidae belongs to Michelinoceratida'
- 'Cyrtactinoceras belongs to Proteoceratidae'
- 'Engorthoceras belongs to Engorthoceratidae'
- 'Engorthoceratidae belongs to Michelinoceratida'
- 'Ephippiorthoceras belongs to Proteoceratidae'
- 'Eskimoceratidae belongs to Michelinoceratida'
- 'Euorthoceras belongs to Proteoceratidae'
- 'Geisonoceratidae belongs to Michelinoceratida'
- 'Gorbyoceras belongs to Proteoceratidae'
- 'Gordonoceras belongs to Proteoceratidae'
- 'Greenlandoceratidae belongs to Michelinoceratida'
- 'Hammelloceras is a subjective synonym of Gorbyoceras'
- 'Hammelloceratidae is a subjective synonym of Proteoceratidae'
- 'Kogenoceras is a subjective synonym of Tofangoceras'
- 'Mesnaquaceras belongs to Proteoceratidae'
- 'Michelinoceras primum belongs to Michelinoceras'
- 'Michelinoceras richardsi belongs to Michelinoceras'
- 'Michelinoceras vandiverense belongs to Michelinoceras' according to Ulrich et al. 1944
- 'Monomuchites belongs to Proteoceratidae'
- 'Mooreoceratidae is a subjective synonym of Pseudorthoceratidae'
- 'Offleyoceratidae belongs to Michelinoceratida'
- 'Ohioceratidae is an invalid subgroup of Cephalopoda'
- 'Orthoceras clarksvillense is recombined as Pleurorthoceras clarksvillense'
- 'Orthoceras selkirkense belongs to Orthoceras' according to Whiteaves 1892
- 'Orthoceras selkirkense is recombined as Pleurorthoceras selkirkense'
- 'Orthoceras truncatum belongs to Orthoceras' according to Barrande 1860
- 'Orthoceras truncatum is recombined as Sphooceras truncatum'
- 'Orthoceratidae belongs to Michelinoceratida'
- 'Orthoceros regularis belongs to Orthoceros' according to Schlotheim 1820
- 'Orthoceros regularis belongs to Orthoceros'
- 'Orthocerotidae is a subjective synonym of Orthoceratidae'
- 'Orthonybyoceras belongs to Proteoceratidae'
- 'Polygrammoceras belongs to Troedssonellidae'
- 'Proteoceras belongs to Proteoceratidae'
- 'Pseudeskimoceras belongs to Eskimoceratidae'
- 'Rasmussenoceras belongs to Allumettoceratidae'
- 'Sactorthoceratidae belongs to Michelinoceratida'
- 'Sinoceratidae belongs to Michelinoceratida'
- 'Sphooceras belongs to Sphooceratidae'
- 'Spyroceratidae is a subjective synonym of Pseudorthoceratidae'
- 'Striatoceratidae belongs to Michelinoceratida'
- 'Tofangoceras belongs to Proteoceratidae'
- 'Tripteroceras belongs to Allumettoceratidae'
- 'Tripterocerina belongs to Allumettoceratidae'
- 'Troedssonoceratidae is replaced by Striatoceratidae'
- 'Whiteavesites belongs to Clinoceratidae'