Genus: Psittacosaurus OSBORN, 1923
Etymology: Greek, psittakos, “parrot” and Greek, sauros, “lizard”: “Parrot-beaked lizard”.

Species: neimongoliensis RUSSELL & ZHAO, 1996
Etymology: Refers to the Inner Mongolia Autonomous Region (Nei Mongol Zizhiqu) in which the type locality occurs.

Holotype: IVPP 12-0888-2

Locality: 1 km southeast of Yangpo village, 10 km north of main east-west highway, 80 km west of Dongsheng, and 63 km east of Hangginqi, in Ordos region, Ordos (Shaan-Gan-Ning) Basin, Inner Mongolia (Nei Mongolia), China.

Horizon: Ejinhoro Formation.

Biostratigraphy:

Age: Early Cretaceous.

Material: Nearly complete skeleton lacking much of braincase and distal caudal vertebrae.

Note: Paleopathology, infection-induced exostoses on the left transverse porcess of the 7th dorsal in front of the sacrum. The proximal end of the associated rib is also pathologically swollen and dorsoventrally pierced by a large oval foramen.

ne fragments.

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Species: lujiatunensis ZHOU, GAO, FOX, & CHEN, 2006
Etymology: In reference to the type locality, Lujiatun.

Locality: Lujiatun, near Beipiao, Liaoning Province, China.

Horizon: Lowest part of the Yixian Formation.

Biostratigraphy:

Age: Hauterivian Stage, Late Neocamian Subepoch, Middle Early Cretaceous Epoch, Middle Early Cretaceous.

Referred material:

HEDRICK, GAO, TUMARKIN-DERATZIAN, SHEN, HOLLOWAY, ZHANG, HARKENSON, LIU, ANNE, & DODSON, 2016

DMNH D2596: Fragmentary skeleton, with a pathologic left tibia.