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
Sister taxa: none
Type specimen: CNHM (FMNH) UR 148, a partial skull (maxillary with dentition and partial lower jaw with roots of teeth). Its type locality is Locality HA ("Lower San Angelo Fm."), which is in a Kungurian/Roadian fluvial claystone/conglomerate in the San Angelo Formation of Texas.