Gastropoda - Prosobranchia - Orthonematidae

Full reference: J. B. Knight. 1934. The gastropods of the St. Louis, Missouri, Pennsylvanian outlier. VIII. The Turritellidae. Journal of Paleontology 8(4):433-447

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 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 telescopiforme, Orthonema tirusum, Orthonema tricingulatum, Orthonema youngianum

Type specimen: YPM 13946, a shell

Ecology: epifaunal

Average measurements (in mm): shell 19.0 x 4.8