Table 1 Comparison of the higher level classification schemes of nautiloid cephalopods used by Flower and Kummel (1950) and the Russian and American treatises
Flower and Kummel (1950) | Ruzhentsev et al. (1962) (Osnovy) | Teichert et al. (1964) (Treatise Part K) | |||
|---|---|---|---|---|---|
Subclass | Order | Superorder | Order/suborder | Subclass | Order/superfamily |
Nautiloidea | Not recognised | Nautiloidea | Order Volborthellida | Doubtful nautiloid | Order Volborthellida |
Order Ellesmeroceratida | Order Ellesmeroceratida | Nautiloidea | Order Ellesmerocerida | ||
Order Bassleroceratida | |||||
Order Tarphyceratida | Order Tarphyceratida  Suborder Tarphyceratina  Suborder Barrandeoceratina | Order Tarphycerida | |||
Order Barrandeoceratida | Order Barrandeocerida | ||||
Order Michelinoceratida | Order Orthoceratida | Order Orthocerida Superfamily Orthocerataceae Superfamily Pseudorthocerataceae | |||
Order Ascoceratida | Order Ascoceratida | Order Ascocerida | |||
Order Discosorida | Order Discosorida | Order Discosorida | |||
Order Oncoceratida | Order Oncoceratida | Order Oncocerida | |||
Orders Nautilida, Centroceratida, Rutoceratida and Solenochilida | Order Nautilida  Suborder Rutoceratina  Suborder Tainoceratina Suborder Centroceratina Suborder Liroceratina Suborder Nautilina | Order Nautilida  Superfamily Trigonocerataceae  Superfamily Tainocerataceae  Superfamily Aipocerataceae  Superfamily Clydonicerataceae  Superfamily Nautilaceae | |||
Order Actinoceratida | Actinoceratoidea | Order Actinoceratida | Actinoceratoidea | Order Actinocerida | |
Order Endoceratida | Endoceratoidea | Order Endoceratida  Suborder Proterocameroceratina  Suborder Endoceratina | Endoceratoidea | Order Endocerida | |
Not recognised | Order Intejoceratida | Order Intejocerida | |||
Not recognised | Bactritoidea | Order Bactritida | Bactritoidea | Order Bactritida | |