Species: longifrons BORSUK-BIALYNICKA, 1984
Etymology: Latin, longus, "long" and Latin, frons, "front."
Holotype: ZPAL MgR-III/59
Locality: Hermiin Tsav (Khermeen Tsav), western Ömnögov (South Gobi), Mongolia.
Horizon: Barun Goyot Formation, = Red Beds of Khermeen Tsav.
Biostratigraphy:
Age: Middle Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Skull.
Referred material:
ZPAL MgR-III/67: Skull lacking its rostral part, almost all of the jugal arches, both posterolateral process of the parietal and the supraoccipital and both of the postental parts of the mandible is preserved.
GAO & NORELL, 2000
Locality: Tögrögiin Shiree (= Tugrugeen Shireh, Tugrikin-Shireh locality), Ömnögov (South Gobi), Mongolia.
Horizon: Djadochta Formation.
Biostratigraphy:
Age: Middle Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material:
IGM 3/170 (MAE 24/93-26): Incomplete skull with mandibles and partial postcranial skeleton.
Locality: Ukhaa Tolgod, northeastern Nemegt Basin, near the salt extraction settlement of Daus, Ömnögov (South Gobi), Mongolia.
Horizon: Djadochta Formation or the Barun Goyot Formation.
Biostratigraphy:
Age: Middle – Upper Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material:
Number: Not given: