Classification of Sereno 1990
G. †Psittacosaurus Osborn 1923
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†Psittacosaurus meileyingensis Sereno et al. 1988
†Psittacosaurus mongoliensis Osborn 1923
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Invalid names: Protiguanodon mongoliense Osborn 1923 [synonym], Psittacosaurus guyangensis Cheng 1982 [synonym], Psittacosaurus osborni Young 1932 [synonym]
†Psittacosaurus xinjiangensis Sereno and Chao 1988
Invalid names: Protiguanodon Osborn 1923 [synonym]