Trilobita - Corynexochida - Zacanthoididae

Full reference: C. E. Resser. 1939. The Spence Shale and its fauna. Smithsonian Miscellaneous Collections 97(12):1-29

Belongs to Zacanthoides according to C. E. Resser 1939

Sister taxa: Zacanthoides abbreviatus, Zacanthoides adjunctus, Zacanthoides gradatus, Zacanthoides holopygous, Zacanthoides holopygus, Zacanthoides idahoensis, Zacanthoides kelsayae, Zacanthoides sampsoni

Type specimen: USNM 96502, a pygidium

Ecology: nektobenthic carnivore