Genus: Tombaatar ROUGIER, NOVACEK & DASHZEVEG, 1997
Etymology: Tom, transliteration from the Mongolian, "big" and Mongolian, bataar, "hero"; a common suffix from Mongolian multituberculates.

Species: sabuli ROUGIER, NOVACEK & DASHZEVEG, 1997
Etymology: Latin, sabuli, "sand," referring to the sand dunes and related terrain of the Gobi Desert at present and also with Tombaatar lived during the Late Cretaceous.

Holotype: PSS-MAE 122

Locality: Ukhaa Tolgod, near the salt extraction settlement of Daus, northeastern Nemegt Basin, Gurvan Tes Somon, Ömnögov (South Gobi), Mongolia.

Horizon: Unnamed Formation equivelent to the Djadokhta Formation or the Barun Goyot Formation.

Biostratigraphy:

Age: Middle-Late Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: A partial skull with fragmentary rostrum and anterior portion of the braincase, with both 12, right 13, left P1, P3, and left and right P4, M1-2.