Jiutaisaurus

Jiutaisaurus (meaning "Jiutai lizard") is a genus of sauropod dinosaur from the Quantou Formation of Jilin, China. The formation dates from the Early - Late Cretaceous boundary. The type species, Jiutaisaurus xidiensis, was described by Wu et al. in 2006, and is based on eighteen vertebrae. It probably lived alongside Changchunsaurus and Helioceratops.

==Discovery and naming== In September 2003, a team from Jilin University conducted a fossil excavation in Xidi Village, Jiutai, and recovered 18 caudal vertebrae from a sauropod, as well as some other fossils. In March 2006, Wu Wenhao, Dong Zhiming, Sun Yuewu, Li Chuntian, and Li Tao described the vertebrae as a new genus and species, Jiutaisaurus xidiensis (), named for the discovery site.