Species: clarki DAWLEY, ZAWISKIE & COSGRIFF, 1979
Etymology:

Holotype: UW 11564-A-G

Locality: Clark Locality, Sec, 21, T40N R84 W, Big Horn Mountains, Natrona County, Wyoming.

Horizon: Popo Agie Formation.

Biostratigraphy:

Age: Otischalkian, Late Carnian Stage, Lower Late Triassic Epoch, Late Triassic.

Material: Skull.

Referred specimen:

UW 11564-b: Portion of right ilium.

UW 11562-X: Left Ulna.

UW 11562-Z: Left tibia.

UW 11562-V: Neural spine.

Note: WROBLEWSKI, 1997, some of the material belongs to two different specimens and an interminate phytosaur.