Species: nessovi NOVACEK, ROUGIER, WIBLE, McKENNA DASHZEVEG & HOROVITZ, 1997
Etymology: In honor of Lev. Nesov.

Holotype: PSS-MAE 102

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

Horizon: Djadokhta Formation or the Barun Goyot Formation.

Biostratigraphy:

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

Material: Skull with nearly complete skeleton.

Referred material:

PSS-MAE 103-106: Skull and skeletons.

PSS-MAE 110: Skull with lower jaws articulated, but lacking anterior snout and anterior mandible.

PSS-MAE 111: Complete skull with lower jaws in articulation.