Trilobita - Asaphida - Asaphidae

Alternative combination: Pseudonileus willdeni

Full reference: L. F. Hintze. 1952. Lower Ordovician trilobites from western Utah and eastern Nevadea. Utah Geological and Mineralogical Survey Bulletin 48:249 p.

Belongs to Protopresbynileus according to L. F. Hintze 1954

Sister taxon: Presbynileus (Protopresbynileus) glaber

Type specimen: 26300 (AMNH), a cephalon/head (cranidium)

Ecology: fast-moving low-level epifaunal deposit feeder