Classification of Lambert et al. 2001

G. †Oviraptor Osborn 1924
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†Oviraptor philoceratops Osborn 1924
G. †Velociraptor Osborn 1924
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G. †Saurornithoides Osborn 1924
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Or. †Ornithischia Seeley 1888 [ornithischian]
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Unr. †Marginocephalia Sereno 1986
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Subor. †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. †Asiaceratops Nessov et al. 1989
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†Asiaceratops salsopaludalis Nessov et al. 1989
Superfm. †Ceratopsoidea Hay 1902
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
G. †Montanoceratops Sternberg 1951
G. †Graciliceratops Sereno 2000
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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: Breviceratops kozlowskii Maryanska and Osmólska 1975 [synonym]
Invalid names: Breviceratops Kurzanov 1990 [synonym]
G. †Protoceratops Granger and Gregory 1923
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†Protoceratops andrewsi Granger and Gregory 1923
†Protoceratops hellenikorhinus Lambert et al. 2001
G. †Turanoceratops Nessov et al. 1989
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†Turanoceratops tardabilis Nessov et al. 1989
G. †Udanoceratops Kurzanov 1992
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†Udanoceratops tschizhovi Kurzanov 1992
Invalid names: Microceratops Bohlin 1953 [nomen dubium]
G. †Chaoyangsaurus Zhao et al. 1999
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†Chaoyangsaurus youngi Zhao et al. 1999