Species: crassus GILMORE, 1943
Etymology:

Holotype: AMNH 6655

Locality: Bayan Zag (= Bayn Dzak, Shabarakh Usu GILMORE, 1943), Ömnögov (South Gobi), Mongolia.

Horizon: Djadochta Formation.

Biostratigraphy:

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

Material: Left maxilla, complete except for extreme anterior and posterior ends and tip of nasal process, lower portion of jugal and most of ectopterygoid are attached, nearly a complete series of 12 acrodont teeth are present but badly worn.

Referred material:

ZPAL MgR-II/40: Right maxilla, preserved nearly identically with holotype except for lacking the entire ascending part of jugal.

ZPAL MgR-II/73: Middle portion of left mandible including the coronoid and posterior 2/3 part of dentary and splenial, and anterior portions of angular and supraangular.

 

GAO & HUO, 1995

Locality: Bayan Manduhu, Urad Houqi, Inner Mongolia, China.

Horizon: Djadochta Formation.

Biostratigraphy:

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

Material:

IVPP V10031-V10036: All Incomplete skulls with mandible attached.

IVPP V10037: Incomplete left mandibular ramus.

 

GAO & NORELL, 2000

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:

IGM 3/74 (MAE 83/93-89), 3/75 (MAE 63/93-153): Incomplete skulls with mandibles.

 

Locality: Zos Wash Locality, Nemget Basin, Ömnögov (South Gobi), Mongolian Gobi Desert.

Horizon: Djadochta Formation.

Biostratigraphy:

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

Material:

IGM 3/76 (MAE 96-105): Incomplete skull with mandibles.

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Species: tugrikinensis ALIFANOV, 1989
Etymology:

Holotype: PIN 3143/102

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: Maxilla and molar bone, right maxilla, postorbital and squamosal, fragment of pterygoid, left and right mandibles.