Species: kozlowskii (MARANYASKA & OSMOLOSKA, 1975) KURZANOV, 1990
Etymology: In honor of Prof. Roman Kozlowski, the eminent Polish paleontologist.
= Protoceratops kozlowskii MARYANSKA & OSMOLSKA, 1975
Holotype: ZPAL MgD-1/117
Locality: Khulsan, Nemegt basin, Ömnögov (South Gobi), Mongolia.
Horizon: Barun Goyot Formation.
Age: Middle –Late Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Nearly complete skull and part of postcranial skeleton of a juvenile.
ZPAL MgD1/116: Fragmentary skull of a juvenile.
ZPAL MgD1/118: 2 nearly complete dentaries with fragmentary postcranial elements of a young individual.
ZPAL MgDI/119: Anterior fragment of dentary and 3 neural arches of a caudal vertebrae.
ZPAL MgDI/120: Anterior part of 2 dentaries with teeth and several isolated teeth.
ZPAL MgDI/121: Fragment of maxilla of a very immature individual with 4 teeth.
ZPAL MgDI/122: Several isolated teeth.
PIN 3142/2, 3: Nearly complete skulls.
PIN 3142/4: Skull missing snout and some of the frill, and dentary, of an adult.
PIN 3142/5: Skull of an adult.