Cephalopoda - Ellesmerocerida - Ellesmeroceratidae
Alternative spelling: Clarkeoceras
Full reference: R. Ruedemann. 1905. The structure of some primitive cephalopods. New York State Museum Bulletin 80:296-341
Parent taxon: Ellesmeroceratidae according to B. Kröger and E. Landing 2007
Sister taxa: Albertoceras, Annoceras, Barnesoceras, Boreoceras, Bridgeoceras, Buehleroceras, Burenoceras, Caseoceras, Chepuloceras, Clelandoceras, Conocerina, Cumberloceras, Dakeoceras, Ectenoceras, Ectenolites, Ellesmeroceras, Eorudolfoceras, Eremoceras, Hemichoanella, Lebetoceras, Levisoceras, Llanoceras, Loxochoanella, Muriceras, Oelandoceras, Oneotoceras, Pachendoceras, Quebecoceras, Robsonoceras, Ruthenoceras, Shantungendoceras, Smithvilloceras, Stemtonoceras, Ventroloboceras, Walcottoceras, Woosteroceras
Subtaxa: Clarkoceras newtonwinchelli, Clarkoceras ruedemanni
Ecology: nektobenthic carnivore