Alternative spelling: Oncoceratida
Full reference: R. H. Flower and B. Kummel, Jr. 1950. A Classification of the Nautiloidea. Journal of Paleontology 24(5):604-616
Parent taxon: Multiceratoidea according to A. Pohle et al. 2022
See also Chen et al. 1981, Crick 1981, Kröger 2008, Kröger 2013, Miagkova 1967, Mutvei 2013, Sepkoski 2002, Shevyrev 2006 and Teichert et al. 1964
Sister taxa: Apocrinoceratidae, Apsidoceratidae, Ascocerida, Bassleroceratidae, Clinoceratidae, Cyclostomiceratidae, Cyrtocerinida, Discosorida, Tarphycerida, Uranoceratidae
Subtaxa: Acleistoceratidae Agrioceras Aktjuboceratidae Alloceras Almaloceras Anonymoceras Anthomorpha Antonoceras Aphyctoceras Apioceras Archiacoceratidae Atomoceras Balashovia Barskoceras Brevicoceratidae Corbuloceras Corysoceras Cyrthocerataceae Cyrtoceras Devonocheilidae Diestoceratidae Doleroceras Eocyrtoceras Eudoceras Gomphoceras Graciloceratidae Guangyuanoceras Guangyuanoceroides Hemiphragmoceratidae Iowoceras Jovellaniidae Karoceratidae Kophinoceras Lychnoceras Megaloceras Mimolychnoceras Mnemoceras Nelimenia Nothoceratidae Oligoceras Oncoceratidae Oonoceratidae Oratoceras Pachtoceras Polyelasmoceratidae Poterioceratidae Pseudobrevicoceras Pyramidoceras Ramussenoceras Rutoceratoidea Spanioceras Sycoceras Torquatoceras Trigonodema Trimeroceratidae Tripleuroceratidae Valcouroceratidae Wetherbyoceras Xainzanoceras
Ecology: fast-moving nektobenthic carnivore