Alternative spelling: Ellesmeroceratida
Full reference: R. H. Flower and B. Kummel, Jr. 1950. A Classification of the Nautiloidea. Journal of Paleontology 24(5):604-616
Parent taxon: Nautiloidea according to D. H. Evans 2005
Sister taxa: Ascocerida, Basslerocerida, Orthochoanites, Rutoceratida, Sueroceras, Teichertia
Subtaxa: Acaroceras, Anhuiceras, Antacaroceras, Bambusoceras, Bassleroceratidae, Belloceras, Centrocyrtocerina, Chabactoceras, Cyclostomiceratidae, Cyptendocerina, Cyrtocerinidae, Cyrtocerinina, Dongshanoceras, Eburoceras, Ellesmeroceratidae, Ellesmeroceratina, Eoclarkoceras, Eocyckistomiceras, Eodiaphragmoceras, Eoectenolites, Eothinoceratidae, Huaiheceras, Huiaihecerina, Hunyuenoceras, Irianoceras, Jiagouceras, Keraiaceras, Lunanoceras, Meikeloceras, Paradakeoceras, Parapalaeoceras, Paraplectronoceras, Plectronoceratina, Protocycloceratidae, Pseudendoceras, Purmanarcoceras, Qiushougouceras, Rectseptoceras, Rhabdiferous, Rioceratidae, Rudolfoceratidae, Shideleroceratidae, Sinolebetoceras, Tanycameroceras, Theskeloceras, Vassaroceras, Weishanhuceras, Xiaoshaoceras, Zhuibianoceras
Ecology: nektobenthic carnivore