Species: knoxensis OLSON, 1951
Etymology: In reference to Knox County, Texas.

Holotype: CNHM UR 14

Locality: Locality KF (OLSON 1948) at three-channel hill, approximately 7 miles north of Vera, Knox County, Texas.

Horizon: Upper part of Vale Formation, Middle Clear Fork Group.

Biostratigraphy: Land-vertebrate faunachron lower to middle D.

Age: Upper Leonardian Stage,Upper Rotliegendes Epoch, Early Permian.

Material: Skull, lower jaws, 6 anterior vertebrae and partial shoulder girdle.