Protoceratopidae
Ornithischia Genasauria Cerapoda Marginocephalia Ceratopia Neoceratopia Protoceratopidae [Herbivore]
Represents a radiation of small dinosaurs that show at least incipient stages of many of the features that characterize the more derived familiy Ceratopidae.
Cretaceous Early
Australia
Serendipaceratops arthurcclarkei - Wonthaggi Formation, Inverloch - Victoria
Leptoceratops sp. (1)
Cretaceous Late
Canada
Leptoceratops gracilis - Scollard Formation - Alberta
US
Leptoceratops gracilis - Scollard Formation, Alberta, Canada; Lance Formation, Wyoming, Hell Creek Formation, Montana
Leptoceratops sp. (2) - Pinyon Conglomerate, Wyoming
Montanoceratops
Leptoceratops cerorhynchus - St. Mary River Formation, Montana
Montanoceratops cerorhynchus - St. Mary River Formation, Montana
China
Magnirostris dodsoni - Bayan Mandahu area in Inner Mongolia
Protoceratops andrewsi - Minhe Formation
Protoceratops hellenikorhinus - Bayan Madahu Formation
Mongolia
Bainoceratops efremovi - Djadochta Formation, Bayn Dzak
Graciliceratops mongoliensis - Baynshirenskaya Svita
Microceratops gobiensis - Minhe Formation
Protoceratops andrewsi - Djadochta Formation, Beds of Toogreeg, ?Beds of Aleg Teg
Protoceratops kozlowskii ? - Barun Goyot Formation
Udanoceratops tschizhovi - Udan-Sayr fossil locality