Cephalopoda - Orthocerida - Orthoceratidae
Invalid subtaxa: Orthoceratites Lamarck 1799 [nomen nudum], Orthoceros Brünnich 1771 [objective synonym]
Parent taxon: Orthoceratidae according to D. H. Evans 1994
Sister taxa: Bifoveoceras, Chebbioceras, Ctenoceras, Infundibuloceras, Kopaninoceras, Merocycloceras, Michelinoceras, Orthocycloceras, Palorthoceras, Pleurorthoceras, Pojetoceras, Pseudospyroceras, Striatocycloceras, Theoceras, Tibichoanoceras, Trematoceras, Copiceras, Ogygoceras, Oxfordoceras
Subtaxa: Orthoceras blakei, Orthoceras burgense, Orthoceras decrescens, Orthoceras elegantulum, Orthoceras elongatocinctum, Orthoceras expansum, Orthoceras gradatum, Orthoceras hulli, Orthoceras lepton, Orthoceras luhai, Orthoceras oehlerti, Orthoceras orientale, Orthoceras punjabiense, Orthoceras rachidium, Orthoceras shastense, Orthoceras siculum, Orthoceras spissiseptum, Orthoceras subtriangulare, Orthoceras vesiculosum, Orthoceras waageni, Orthoceros regularis
Ecology: nektonic carnivore