Article: A new species of the ornithischian dinosaur Psittacosaurus from the Early Cretaceous of Thailand
Eric Buffetaut and Varavudh Suteethorn
Dinosaur jaw remains from the Early Cretaceous Khok Kruat Formation of northeastern Thailand, including a well-preserved dentary and a maxilla fragment, are described as belonging to a new species of the primitive ceratopian Psittacosaurus, P. sattayaraki. It differs from previously described species of Psittacosaurus from Mongolia and China in the morphology of its dentary. The Khok Kruat Formation is referred to the Aptian-Albian on the basis of palaeontological evidence, and this supports the hypothesis that faunal assemblages containing Psittacosaurus in other parts of Asia are late Early Cretaceous in age. This occurrence in the Early Cretaceous of the Indochina Block indicates that by that time the microcontinent had become accreted to mainland Asia.