Classification of You and Dodson 2004

Microceratops sulcidens Bohlin 1953
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G. †Microceratops Bohlin 1953
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Microceratops gobiensis Bohlin 1953
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Asiaceratops salsopaludalis Nessov et al. 1989
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G. †Asiaceratops Nessov et al. 1989
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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. †Chaoyangsaurus Zhao et al. 1999
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Chaoyangsaurus youngi Zhao et al. 1999
G. †Graciliceratops Sereno 2000
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G. †Leptoceratops Brown 1914
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Leptoceratops gracilis Brown 1914
G. †Liaoceratops Xu et al. 2002
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Liaoceratops yanzigouensis Xu et al. 2002
G. †Montanoceratops Sternberg 1951
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Montanoceratops cerorhynchus Brown and Schlaikjer 1942
G. †Protoceratops Granger and Gregory 1923
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Protoceratops andrewsi Granger and Gregory 1923
Protoceratops hellenikorhinus Lambert et al. 2001
G. †Udanoceratops Kurzanov 1992
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Udanoceratops tschizhovi Kurzanov 1992
G. †Zuniceratops Wolfe and Kirkland 1998
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Zuniceratops christopheri Wolfe and Kirkland 1998
Fm. †Psittacosauridae Osborn 1923
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G. †Psittacosaurus Osborn 1923
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Psittacosaurus meileyingensis Sereno et al. 1988
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Invalid names: Protiguanodon mongoliense Osborn 1923 [synonym]
Psittacosaurus neimongoliensis Russell and Zhao 1996
Psittacosaurus ordosensis Russell and Zhao 1996
Psittacosaurus osborni Young 1932
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Invalid names: Psittacosaurus tingi Young 1932 [synonym]
Psittacosaurus xinjiangensis Sereno and Chao 1988
Psittacosaurus youngi Chao 1962
Invalid names: Protiguanodon Osborn 1923 [synonym], Psittacosaurus sattayaraki Buffetaut and Ingavat 1992 [nomen dubium]
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]
Infraor. †Ceratopsia Marsh 1890 [ceratopsian]
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Invalid names: Turanoceratops Nessov et al. 1989 [nomen dubium]
Unr. †Ceratopsia Marsh 1890 [ceratopsian]
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Invalid names: Kulceratops Nessov 1995 [nomen dubium], Kulceratops kulensis Nessov 1995 [nomen dubium]