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: Cephalopoda according to B. Kröger 2008
Sister taxa: Actinoceratoidea, Actinocerida, Actinodochmioceras, Akidocheilus, Ammonoidea, Aulacocerida, Ausseites, Avramidiscus, Bactritoidea, Belemnitida, Belopeltis, Belosaepia, Boletzkida, Botellusoceras, Burronoceras, Coleoidea, Conchorhynchus, Cyrtoceras, Dartoceras, Davidiceras, Deltoceratidae, Desmoceras, Discosorida, Dissimilites, Endoceratoidea, Endocycloceratidae, Erlangericheilus, Gonatocheilus, Hadrocheilus, Heyuncunoceras, Kailiceras, Kotetishvilia, Lamellaptychus, Leptocheilus, Lituitida, Mesoteuthoidea, Nautilida, Nautiloidea, Neptunoceratidae, Orthoceratina, Orthoceratoidea, Orthodochmioceras, Palaeoteuthis, Patruliusiceras, Plectonocerida, Protactinocerida, Pseudorthocerida, Rhyncholite, Rhynchoteuthis, Robsonoceratidae, Sabbaiceras, Scaptorrhynchus, Sichunoceras, Songkanoceras, Spirulirostridae, Stemtonoceratidae, Tarphycerida, Tetrabranchiata, Tillicheilus, Toxancyloceras, Werthenoceras, Yanhecerida, Yannanoceras, Yichangoceras, Paratrematoceras, Balticoceras, Arkonoceras, Eotripteroceras, Hesperoceras, Sinoceras
Subtaxa: Acleistoceratidae, Agrioceras, Aktjubocheilus, Alloceras, Almaloceras, Anonymoceras, Anthomorpha, Antonoceras, Aphyctoceras, Apioceras, Archiacoceratidae, Atomoceras, Balashovia, Brevicoceratidae, Calchasiceras, Corbuloceras, Corysoceras, Dalecarlioceras, Diestoceratidae, Doleroceras, Edenoceras, Eocyrtoceras, Eudoceras, Gomphoceras, Graciloceratidae, Guangyuanoceras, Guangyuanoceroides, Gyroceras, Hemibeloitoceras, Hemiphragmoceratidae, Hiregiroceras, Iowoceras, Irinites, Jovellaniidae, Kallholnoceras, Karoceratidae, Kijoceras, Kophinoceras, Leonardoceras, Lychnoceras, Megaloceras, Meloceras, Mimolychnoceras, Mnemoceras, Nelimenia, Neoceras, Nothoceratidae, Oligoceras, Oncoceratidae, Oonoceratidae, Oratoceras, Pachtoceras, Phthanoncoceratidae, Polyelasmoceratidae, Poterioceratidae, Pseudobrevicoceras, Pyramidoceras, Ramussenoceras, Rhomboceras, Spanioceras, Sycoceras, Talattoceras, Torquatoceras, Trigonodema, Trimeroceratidae, Tripleuroceratidae, Tshingizoceras, Valcouroceratidae, Wetherbyoceras, Xainzanoceras
Ecology: fast-moving nektobenthic carnivore