Full reference: J. Dzik. 1984. Phylogeny of the Nautiloidea. Palaeontologica Polonica 45:1-212
Parent taxon: Orthoceratida according to B. Kröger 2013
See also Mutvei 2002
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, Orthodochmiocerataceae, Paradnatoceras, Paramooreoceras, Plicatoceras, Podoliceras, Proteoceratidae, Pseudorthocerataceae, Pseudorthoceratoidea, Pythonoceras, Rhabdites, Rhipsites, Sactorthoceratidae, Sannionites, Sichuanaceras, Sichuanoceratidae, Sphaerorthoceratidae, Sphaerortoceratidae, Subspyroceras, Tartaroceras, Tretoceras, Tripteroceratidae, Trispectes, Uralharuspex, Vericeras, Zhuralevia, Michelinoceratidae, Allumettoceratidae, Engorthoceratidae, Eskimoceratidae, Choanoceratidae, Cycloceratidae, Striatoceratidae
Subtaxa: Dawsonoceratidae Eriditidae
Ecology: nektonic carnivore
Distribution:
• Permian of Azerbaijan (1 collection)
• Devonian of Australia (1), Canada (2: Ontario), the Czech Republic (1), Morocco (3)
• Niagaran of United States (1: Indiana)
• Silurian of Argentina (1), Australia (1), Canada (5: Quebec), China (7), the Czech Republic (8), Ireland (1), Italy (6), Lithuania (5), the Russian Federation (2), Sweden (7), the United Kingdom (3), United States (61: Illinois, Indiana, Iowa, New York, Tennessee, Wisconsin)
• Arenig of Argentina (1)
• Ordovician of Australia (1), Canada (5: Manitoba, Northwest Territories, Quebec), Estonia (11), Sweden (3), the United Kingdom (1), United States (26: Illinois, Iowa, Wisconsin, Minnesota, Ohio)
Total: 164 collections including 197 occurrences