Reptilia - Testudines - Trionychidae

Alternative combinations: Aspideretes foveatus, Trionyx foveatus

Full reference: J. Leidy. 1856. Notices of remains of extinct reptiles and fishes, discovered by Dr. F. V. Hayden in the bad lands of the Judith River, Nebraska Territory. Proceedings of the Academy of Natural Sciences of Philadelphia 8:72-73

Belongs to Hummelichelys according to V. M. Chkhikvadze 2000

Sister taxa: Hummelichelys annae, Hummelichelys beecheri, Hummelichelys ellipticus, Hummelichelys grangeri, Hummelichelys guttatus, Hummelichelys quadratus, Hummelichelys reesidei, Hummelichelys sagatus, Hummelichelys subquadratus, Hummelichelys vegetus

Type specimen: ANSP specimens, a partial shell (small fragments of costal and sternal plates). Its type locality is Judith River badlands (USGS), which is in a Campanian terrestrial horizon in the Judith River Formation of Montana.