Trilobita - Phacopida - Cheiruridae

Full reference: H. B. Whittington. 1963. Middle Ordovician trilobites from Lower Head, western Newfoundland. Bulletin of the Museum of Comparative Zoology 129(1):1-118

Belongs to Cydonocephalus according to H. B. Whittington 1963

Sister taxa: Cydonocephalus griphus, Cydonocephalus mercurus, Cydonocephalus prolificus, Cydonocephalus prominulus, Cydonocephalus torulus

Type specimen: GSC 16280, a cephalon/head. Its type locality is Alpha Boulder, Table Head, which is in a Whiterockian reef, buildup or bioherm limestone in Canada.

Ecology: fast-moving low-level epifaunal carnivore