Classification of Coombs, Jr. 1982
Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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Fm. †Psittacosauridae Osborn 1923
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G. †Psittacosaurus Osborn 1923
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†Psittacosaurus mongoliensis Osborn 1923
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Invalid names: Protiguanodon mongoliense Osborn 1923 [synonym], Psittacosaurus osborni Young 1932 [synonym], Psittacosaurus tingi Young 1932 [synonym]
†Psittacosaurus sinensis Young 1958
†Psittacosaurus youngi Chao 1962
G. †Bagaceratops Maryanska and Osmólska 1975
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†Bagaceratops rozhdestvenskyi Maryanska and Osmólska 1975
G. †Protoceratops Granger and Gregory 1923
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†Protoceratops andrewsi Granger and Gregory 1923