A NEW THEROPODA (DILOPHOSAURUS SINENSIS SP. NOV.) FROM YUNNAN, CHINA
Hu Shaojin(Kunming Municipal Museum, Kunming, Yunnan)
In 1987, a team from the Knnming Muni ipal Museum found and excavated a nearly complete specimen of a new species of theropod, Dilophosaurus sinensis, from Xiyang Village, Jinning County, Yunnan Province. The sp cimen was associated with a skeleton of Yunnanosaurus in the Lower Jurassic sediments of the Lower Lufeng Formation. The discovery of Dilophosaurus in China suggests there were close connections between North America and Asia during the Early Jurassic.Diagnosis The most characteristic fetures of the Yunnan specimen are a pair of bony crests on the skull, and a deep notch sep rating the dentigerous margins of the premaxilla and maxilla. The skull is large in proporion to its 5.5 metre long body. These features are shared with Dilophosaurus wetherilli from the Kayenta Formation of Arizona, North America. The Chinese specimen is distinctive in that the bony crests are higher and thicker, and converge posteriorly to contact on the mid ine, the snout is rather short; the teeth of the upper and lower jaws are shorter and stronger; nd there are 5 premaxillary, 13 maxillary and 13 dentary teeth, compared with a dental formula of 4/12/17 in D. wetherilli. One antorbital fenestra is present in the maxilla, although a se ond is represented by a foramen.