关键词: 新铺龙, 海龙, 晚三叠世, 贵州关岭

Abstract: The crania of Xinpusaurus sp. from the Carnian Wayao Formation of Guanling, Guizhou Province is studied in detail and then compared with other two species of Xinpusaurus. The new specimen shows following similarities to other two species: the lateral view looks like a right-angled triangle when the mouth is closed; the frontage of the dentary forms a platform as a result of its bending; a significant curve exists at the end of the premaxilla; the posterior process of the rasal extends far away from the external naris; the post-lateral process of the premaxilla extends beyond the external naris. So it is assigned to be a Xinpusaurus. However, the specimen is still significantly different to other two species: the adult size is relatively larger; the tooth at the end of the premaxilla inclines posteriorly; the premaxilla is not excluded from the formation of the external naris; no tooth on the pterygoid; the prefrontal contacts with the nasal; no tooth on the maxilla and the back of the dentary. Because of the ill preservation of the specimen, the characters of the temporal region and the post cranial can not be identified, and it's assigned to an undefined species of Xinpusaurus.

Key words: Thalattosaurus, Xinpusaurus, Late Triassic, Guanling, Guizhou Province