5 complete skulls, 17 fragmentary skulls, postcranial skeletons, juvenile to adult

It seems possible that al of the basal ceratopian specimens from the Barun Goyot Fm. perttain to a single species. The most appropriate name for that taxon is Bagaceratops rozhdestvenskyi. Brevicaratops may be regarded as a junior synonym of Bagaceratops

Platyceratops tatarinovi along with Lamaceratops tereschenkoi, Bagaceratops rozhdestvenskyi, and Breviceratops kozlowskii are assigned to the family Bagaceratopidae fam. nov. characterized by the fused nasals; the presence of the nasal horn and large subnarial fenestrae posterior to the nares between the premaxilla, maxilla, and nasal; and, pro- bably, the development of undulating ornamentation on the surface of the egg shell. The main evolutionary stages of Asian neoceratopsians are discussed.