Full reference: E. C. Olson and J. R. Beerbower. 1953. The San Angelo Formation, Permian of Texas, and its Vertebrates. Journal of Geology 61(5):389-423
Type specimen: CNHM (FMNH) 149, a partial skeleton (pelvis and limb elements). Its type locality is Locality KN (San Angelo Fm.), which is in a Kungurian/Roadian terrestrial shale/conglomerate in the San Angelo Formation of Texas.