Invalid subtaxa: Baltoceras pusillum Ruedemann 1906 [nomen dubium], Endoceras pusillum Ruedemann 1906 [nomen dubium], Rioceras pusillum Ruedemann 1906 [nomen dubium]
Parent taxon: Endoceratoidea according to C. Teichert et al. 1964
Sister taxa: Changkiuoceras, Colpoceras, Conoceras, Diploceras, Hemiceratites, Hemipiloceras, Intejocerida, Kailuanoceras, Kaipingoceras, Linchengoceras, Neokaipingoceras, Paravaginoceras, Penhsioceras, Pradoceras, Sidemina, Subpenhsioceras, Trifurcatoceras, Yehlioceras
Subtaxa: Allotrioceratidae, Bisonoceras, Botryceras, Cacheoceras, Chaohuceras, Chihlioceratidae, Chisiloceras, Choreanoceroides, Cyrtendoceratidae, Dartonoceras, Disphenoceras, Emmonsoceratidae, Endoceratidae, Eocameroceras, Farroceras, Hoyoceras, Humeoceratidae, Ignoceras, Juaboceras, Kiotoceras, Kugeloceras, Lobocyclendoceras, Manchuroceratidae, Najaceras, Palaeocyclendoceras, Paracyclendoceras, Perkinsoceras, Piloceratidae, Pronajaceras, Proterocameroceratidae, Protocyclendoceras, Rossicoceras, Schmidtoceras, Sewardoceras, Telleroceras, Thylacoceratidae, Trinitoceras, Ventrolobendoceras, Williamsoceras, Winstonoceras, Yorkoceras
Ecology: nektobenthic carnivore