Genus: Mengshanosaurus YUAN, LI, KSEPKA & YU, 2021
Etymology: "Mengshan," name of the highest mountain in the region of the type locality, and Greek, sauros, "lizard."

Species: minimus YUAN, LI, KSEPKA & YU, 2021
Etymology: Latin, minimus, "smallest." In reference to the type specimen is teh smallest neochoristodere currently known.

Holotype: IVPG-T002

Locality: North of Ningjiagou village, Xintai, Shandong Province, China.

Horizon: Mengyin Formation.

Biostratigraphy:

Age: Berriasian-Valanginian Stage, Neocomian Subepoch, Early Cretaceous Epoch, Early Cretaceous.

Material: Nearly complete skull.