Species: mongoliensis OSBORN, 1924
Etymology:

Referred material:

Horizon: Djadochta Formation.

Biostratigraphy:

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

Material:

BARSBOLD, 1983

GIN 100/24: An almost complete, articulated, but dorsoventrally flattened skull, both mandibular rami, and a few fragmentary postcranial bones.

BARSBOLD & OSMOLSKA, 1999

GIN 100/2000: A complete skeleton of a young individual.

PIN 3143/8: An almost complete skull with left mandibular ramus, lacking the right temporal region; the tip of the rostrum is severely damaged.

CLARK, 1992

AMNH: Skull.

NORELL, MAKOVICKY & CLARK, 1997

IGM 100/976: Fragmentary skull and skeleton with furcula.

 

KIELAN-JAWOROWSKA, & BARSBOLD, 1972

Locality: Toogreeg, Toogreegeen Shire, 30 km westwards from 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:

GIN 100/25: Skull and skeleton.
Note: Furcula.

Note: This is the fighting skeleton with Protoceratops andrewsi.

 

NORRELL & MAKOVICKY, 1999

Locality: Near the Volcano sublocality, Flaming Cliffs, 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:

IGM 100/982: Well preserved skull, torso with limbs, missing only the distal part of the tail.

Note: Has furcula.