Cephalopoda - Ellesmerocerida - Protocycloceratidae

Alternative combination: Orthoceras xerxes

Belongs to Protocycloceras according to E. O. Ulrich et al. 1944

Sister taxa: Protocycloceras abnorme, Protocycloceras arkansasense, Protocycloceras becki, Protocycloceras catulus, Protocycloceras doniphonense, Protocycloceras furtivum, Protocycloceras gangshanense, Protocycloceras geronticum, Protocycloceras lamarcki, Protocycloceras levisense, Protocycloceras manitouense, Protocycloceras mendax, Protocycloceras odenvillense, Protocycloceras ordinatum, Protocycloceras philipsburgense, Protocycloceras smithvillense

Ecology: nektobenthic carnivore