Genus: Neimongosaurus ZHANG, XU, ZHAO, SERENO, KUANG & TAN, 2001.
Etymology: Neimongo, for Nei Mongol, the general location of the site of discovery, and Greek, sauros, "reptile."

Species: yangi ZHANG, XU, ZHAO, SERENO, KUANG & TAN, 2001
Etymology: In honor and memory of the founder of vertebrate paleontology in China, Yang Zhongjian (C. C. Young).

Holotype: LH V0001

Locality: Sanhangobi, Sunitezuoqi, 20 km southwst of Erlian City, Inner Mongolia (Nei Mongol), China.

Horizon: Iren Dabasu Formation.

Biostratigraphy:

Age: Cenomanian Stage, Upper Gallic Subepoch, Lowermost Gulf Epoch, Middle Cretaceous.

Material: Partial braincase, anterior end of right dentary, and most of the axial column except the atlas, some mid and posterior dorsal vertebrae, and the distalmost caudal vertebrae, pectoral girdle and forelimb elements including the left and partial right scapulocoracoids, furcula, both humeri, and he left radius, pelvic girdle and hind limb elements including partial left and right ilia, bothe femora and tibiae, left distal tarsal 3 and 4, and most of the left pes.

Referred material:

LH V0008: Sactum composed of 6 cossified vertebraearticulated with both iliu (LH V0008).