Gastropoda - Prosobranchia - Orthonematidae

Full reference: D. H. Erwin. 1988. Permian Gastropoda of the southwestern United States: Cerithiacean, Acteonacea, and Pyramidellacea. Journal of Paleontology 62(4):566-575

Belongs to Orthonema according to D. H. Erwin 1988

Sister taxa: Orthonema amissidecoris, Orthonema ascensus, Orthonema borovskensis, Orthonema carbonaria, Orthonema cochleoides, Orthonema frequens, Orthonema hulusitaiensis, Orthonema illineatus, Orthonema inornatum, Orthonema knighti, Orthonema liratum, Orthonema marvinwelleri, Orthonema nakazawai, Orthonema nebrascense, Orthonema panxianensis, Orthonema paulum, Orthonema paxillus, Orthonema pygmaeum, Orthonema rectimurum, Orthonema salteri, Orthonema sayrei, Orthonema semiornatum, Orthonema silinae, Orthonema simplex, Orthonema socorroense, Orthonema striatonodosum, Orthonema strigatum, Orthonema subtaeniatum, Orthonema telescopiforme, Orthonema tirusum, Orthonema tricingulatum, Orthonema youngianum

Type specimen: USNM 400672, a shell. Its type locality is USNM710d, Lenox Hills, Glass Mountains, which is in a Kungurian marine limestone in the Cathedral Mountain Formation of Texas.

Ecology: epifaunal

Average measurements (in mm): shell width 3.03