Species: louderbacki PENG, 1990
Etymology: In honor of the American Geologist Dr. George D. Louderback.

Holotype: ZDM6011

Locality: Dashanpu (Dashanpu Dinosaur Quarry), lat. 29°5’N, long. 104°50’E, situated 11 km east of Zigong City, 250 km south of Chengdu, Hechuan County, Sichuan Basin, Sichuan (Szechwan) Province, China.

Horizon: Xaishaximiao (Shaximiao) Formation.

Biostratigraphy:

Age: Bathonian-Callovian Stage, Dogger Epoch, Middle Jurassic.

Note: Bajocian (CHEN et al. 1982), Lower Middle Dogger Epoch, Middle Jurassic.

Material: Skull and skeleton.

Crushed skull.

Skull reconstructed.

Skeleton.