Full reference: E. C. Olson. 1962. Late Permian terrestrial vertebrates, U.S.A. and U.S.S.R. Transactions of the American Philosophical Society, New Series 52(2):1-224
Sister taxa: none
Type specimen: CNHM UR 486, a set of postcrania (vertebrae and ribs). Its type locality is Locality KY (San Angelo Fm.), which is in a Kungurian/Roadian fluvial-deltaic shale/sandstone in the San Angelo Formation of Texas.