Parent taxon: Discosorida according to B. Kröger 2008
Sister taxa: Aigoceras, Aipetoceras, Akroceras, Anamesoceras, Andreioceras, Antigyroceras, Apocrinoceratidae, Asbestoceras, Athanatoceras, Brodekoceras, Carotites, Chrysoceras, Chuticeras, Comaroceras, Cyrtogomphoceratidae, Deiloceras, Deinoceras, Discosoridae, Drakonoceras, Dynatoceras, Elaphoceras, Elkanoceras, Elpisoceras, Endostokesoceras, Entimoceras, Exochoceras, Flowerites, Gouldoceras, Huanghuachangoceras, Hysteroceras, Jaregoceras, Kadaroceras, Karadzharoceras, Katageioceras, Kitatites, Kladisoceras, Kotelnyoceras, Lowoceratidae, Lysagoroceras, Mandaloceratidae, Manjoceras, Mesoceratidae, Metrioceras, Mjandymoceras, Myloceras, Neodiscosorus, Nipageroceras, Nucites, Onyxites, Pancornus, Pantoioceras, Paramecynoceras, Parawestonoceras, Parevlanoceras, Pelagoceras, Physioceras, Plagioceras, Platyconoceras, Pseudobolloceras, Pseudophragmoceras, Radoceras, Raphanites, Rhynchoceras, Ropaloceras, Ruedemannoceratidae, Selenoceras, Smileoceras, Sophoceras, Spondeioceras, Stagonites, Strobiloceras, Stroggyloceras, Synetoceras, Taoqupoceras, Taskanoceras, Taxyceras, Therioceras, Tritonoceras, Ukhtoceras, Ungulites, Urtasymoceras, Westonoceratidae, Xiphoceras, Zooceras
Subtaxa: Endoplectoceras, Phragmoceras, Phragmocerina, Pristeroceras, Protophragmoceras, Pseudendoplectoceras, Sthenoceras, Tubiferoceras
Type: Phragmoceras
Ecology: nektobenthic carnivore