Cephalopoda - Ellesmerocerida - Protocycloceratidae

Alternative combination: Orthoceras lamarcki

Synonyms: Protocycloceras whitfieldi Ruedemann 1906, Rhabdocycloceras floweri Zhuravleva 1994

Belongs to Protocycloceras according to B. Kröger and E. Landing 2009

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