Classification of Sereno 2000

Fm. †Tholocephalidae Sereno 1986
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Subfm. †Domocephalinae Sereno 1986
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Unr. †Marginocephalia Sereno 1986
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Unr. †Ceratopsia Marsh 1890 [ceratopsian]
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Infraor. †Neoceratopsia Sereno 1986
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G. †Archaeoceratops Dong and Azuma 1997
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†Archaeoceratops oshimai Dong and Azuma 1997
G. †Chaoyangsaurus Zhao et al. 1999
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†Chaoyangsaurus youngi Zhao et al. 1999
Unr. †Coronosauria Sereno 1986
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Superfm. †Ceratopsoidea Hay 1902
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
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Subfm. †Centrosaurinae Lambe 1915
Invalid names: Ceratopsinae Abel 1919 [empty]
G. †Montanoceratops Sternberg 1951
G. †Turanoceratops Nessov et al. 1989
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†Turanoceratops tardabilis Nessov et al. 1989
Fm. †Protoceratopsidae Granger and Gregory 1923
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G. †Bagaceratops Maryanska and Osmólska 1975
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†Bagaceratops rozhdestvenskyi Maryanska and Osmólska 1975
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Invalid names: Protoceratops kozlowskii Maryanska and Osmólska 1975 [synonym]
Invalid names: Breviceratops Kurzanov 1990 [synonym]
G. †Graciliceratops Sereno 2000
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G. †Protoceratops Granger and Gregory 1923
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†Protoceratops andrewsi Granger and Gregory 1923
G. †Leptoceratops Brown 1914
G. †Udanoceratops Kurzanov 1992
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†Udanoceratops tschizhovi Kurzanov 1992
G. †Psittacosaurus Osborn 1923
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†Psittacosaurus meileyingensis Sereno et al. 1988
Invalid names: Psittacosaurus mazongshanensis Xu 1997 [nomen dubium]
Invalid names: Asiaceratops Nessov et al. 1989 [nomen dubium], Microceratops Bohlin 1953 [nomen dubium], Psittacosaurus sattayaraki Buffetaut and Ingavat 1992 [nomen dubium]
Unr. †Pachycephalosauria Maryańska and Osmólska 1974
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G. †Goyocephale Perle et al. 1982
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†Goyocephale lattimorei Perle et al. 1982
G. †Homalocephale Maryańska and Osmólska 1974
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†Homalocephale calathocercos Maryańska and Osmólska 1974
G. †Ornatotholus Galton and Sues 1983
Fm. †Pachycephalosauridae Sternberg 1945
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Subfm. †Pachycephalosaurinae Sereno 1997
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G. †Pachycephalosaurus Brown and Schlaikjer 1943
G. †Prenocephale Maryańska and Osmólska 1974
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†Prenocephale prenes Maryańska and Osmólska 1974
G. †Stygimoloch Galton and Sues 1983
G. †Tylocephale Maryańska and Osmólska 1974
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†Tylocephale gilmorei Maryańska and Osmólska 1974
G. †Stegoceras Lambe 1902
G. †Stenopelix Meyer 1857
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†Stenopelix valdensis Meyer 1857
G. †Wannanosaurus Hou 1977
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G. †Yaverlandia Galton 1971
Invalid names: Micropachycephalosaurus Dong 1978 [nomen dubium]