Genus: Enigmosaurus BARSBOLD & PERLE, 1983 in BARSBOLD, 1983
Etymology: Greek, ainigma, “enigma, riddle” and Greek, sauros, “lizard”: “Enigma Lizard”.

Species: mongoliensis BARSBOLD & PERLE, 1983 in BARSBOLD, 1983
Etymology: In reference to Mongolia, where the speicmen was found.

Holotype: GIN 100/84

Locality: Kara Khutul, SE Mongolia.

Horizon: Bayan Shireh svita.

Biostratigraphy:

Age: Cenomanian –Turonian Stage, Uppermiddle-uppermost Gallic Subepoch, Lower Gulf Epoch, Late Cretaceous.

Material: Pelvic girdle lacking the upper portion of the ilia.