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Breviceratops
(Kurzanov,1990)
> B.kozlowskii (Maryanska
& Osmolska,1975) =
Protoceratops
kozlowskii ? (Maryanska
& Osmolska,1975)
2 partial juvenile skulls
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.
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