Trilobita - Corynexochida - Zacanthoididae

Full reference: C. E. Resser. 1938. Middle Cambrian fossils from Pend Oreille Lake, Idaho. Smithsonian Miscellaneous Collections 97(3):1-12

Belongs to Zacanthoides according to C. E. Resser 1938

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

Type specimen: USNM 95043. Its type locality is Locality 37n (Pend Oreille Lake), which is in a Cambrian carbonate limestone/shale in the Lakeview Formation of Idaho.

Ecology: nektobenthic carnivore