Full reference: W. C. Sweet. 1964. Nautiloidea–Orthocerida. Treatise on Invertebrate Paleontology (K) Mollusca 3 216-261
Parent taxon: Orthocerida according to D. H. Evans 1994
See also Barskov 1968, Chen et al. 1981, Evans 1994 and Sweet 1964
Sister taxa: Acrosphaerorthoceras, Aptychopsis, Arionoceratidae, Arterioceras, Badouceras, Baltoceratidae, Bogoslovskya, Brachycycloceratidae, Chicagooceras, Cornuella, Cryptocycloceras, Cycloceras, Dictyoceras, Esopoceras, Folioceras, Garryoceras, Heloceras, Jangziceras, Joldagiroceras, Kentronites, Kionoceratidae, Loxoceras, Mericoceras, Molossus, Murchisoniceras, Naivs, Nebroceras, Neorthoceras, Orthoceratidae, Orthoceratina, Orthodochmiocerataceae, Paradnatoceras, Paramooreoceras, Plicatoceras, Podoliceras, Proteoceratidae, Pseudorthoceratoidea, Pythonoceras, Rhabdites, Rhipsites, Sactorthoceratidae, Sannionites, Sichuanaceras, Sichuanoceratidae, Sphaerorthoceratidae, Sphaerortoceratidae, Subspyroceras, Tartaroceras, Tretoceras, Tripteroceratidae, Trispectes, Uralharuspex, Vericeras, Zhuralevia, Allumettoceratidae, Eskimoceratidae, Striatoceratidae, Cycloceratidae, Michelinoceratidae, Engorthoceratidae, Choanoceratidae
Subtaxa: Cyrtactinoceratidae Mysterioceratidae Songkanocerasidae Stereoplasmoceratidae
Ecology: nektonic carnivore
Distribution: