Alternative combination: Bolbocephalus stevensi
Full reference: W. D. Boyce. 1989. Early Ordovician trilobite faunas of the Boat Harbour and Catoche Formations (St. George Group) in the Boat-Harbour-Cape Norman area, Great Northern Peninsula, western Newfoundland. Geological Survey Branch, Department of Mines and Energy, Newfoundland and Labrador, Report 89-2 1-168
Type specimen: NFM F-149, a pygidium. Its type locality is BH-94-95, which is in a Cassinian peritidal lime mudstone/wackestone in the Boat Harbour Formation of Canada.