Wu, X-C., Currie, P.J., Dong, Z., Pan, S. & Wang, T. (2009) A new theropod from the Middle Jurassic of Lufeng, Yunnan, China. Acta Geologica Sinica Vol 83. No 1 pp. 9-24
A new theropod dinosaur, Shidaisaurus jiae gen, et sp. nov., has been desccribed on the basis of an incomplete skeleton. The specimen was found near the base of the Upper Lufeng Formation (early Middle Jurassic) in Yunnan, China. It is the first theropod dinosaur from the Middle Jurassic of Yunnan. Shidaisaurus jiae is distinguishable from the Jurassic theropods by certain features from the braincase, axis, and pelvic girdle. The absence of any pleurocoels in the axis or in any anterior dorsal vertebrae suggests that the new Lufeng theropod is relatively primitive and more plesiomorphic than most of the Middle to Late Jurassic theropods from China. Most Chinese taxa of Jurassic theropod dinosaurs have not been wel desdribed; a further detailed study will be necassary for us to determine their phylogenetic relationships with Shidaisaurus jiae.