Species: clarki GAO & NORELL, 2000
Etymology: In honor to Jim Clark as a wedding present; the species epithet is to recognize Clark’s profound contribution in collecting vertebrate fossils, including many lizard specimens, from the Gobi Desert.

Holotype: IGM 3/53 (MAE 154/93-40)

Locality: Ukhaa Tolgod, northeastern Nemegt Basin, near the salt extraction settlement of Daus, Ömnögov (South Gobi), Mongolia.

Horizon: Djadochta Formation or the Barun Goyot Formation.

Biostratigraphy:

Age: Middle – Upper Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Incomplete skull with mandibles.