The occurrence of Psittacosaurus xinjiangensis Sereno and Chow, 1988 in the Urho area, Junggar Basin, Xinjiang, People's Republic of China

A partial specimen of Psittacosaurus xinjiangensis from the Urho locality in the Western Junggar basin, China, extends the known geographical range of P. xinjiangensis and documents the adult morphology in this species. Variation in the number of denticles on the dentary tooth crowns is documented, possibly representing a decrease in the number of denticles during growth, although a high denticle count remains a diagnostic feature of the...