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 P. J. Wagner 2011

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 paedice, 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 tirusum, Orthonema tricingulatum, Orthonema youngianum

Type specimen: Its type locality is USNM712g, Powwow Canyon, Hueco Mountains, which is in a Sakmarian shallow subtidal limestone in the Hueco Formation of Texas

Ecology: epifaunal

Average measurements (in mm): shell width 3.82