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. †Protoceratops Granger and Gregory 1923
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†Protoceratops andrewsi Granger and Gregory 1923
†Protoceratops hellenikorhinus Lambert et al. 2001
Fm. †Psittacosauridae Osborn 1923
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G. †Psittacosaurus Osborn 1923
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†Psittacosaurus guyangensis Cheng 1982
†Psittacosaurus mazongshanensis Xu 1997
†Psittacosaurus meileyingensis Sereno et al. 1988
†Psittacosaurus mongoliensis Osborn 1923
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Invalid names: Protiguanodon mongoliense Osborn 1923 [synonym]
†Psittacosaurus neimongoliensis Russell and Zhao 1996
†Psittacosaurus ordosensis Russell and Zhao 1996
†Psittacosaurus sinensis Young 1958
†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]