Rhynchonellata - Spiriferida - Trigonotretidae

Alternative combination: Neospirifer brevimarginatus

Full reference: R. D. Hoare. 1960. New Pennsylvanian Brachiopoda from southwest Missouri. Journal of Paleontology 34(2):217-232

Belongs to Neospirifer goreii according to R. D. Hoare 1961

Sister taxa: none

Type specimen: UM 13268, a shell