Classification of Sues and Galton 1982

Fm. †Hypsilophodontidae Dollo 1882 [hypsilophodontid]
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G. †Hypsilophodon Huxley 1870
Fm. †Pachycephalosauridae Sternberg 1945
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G. †Homalocephale Maryańska and Osmólska 1974
G. †Stegoceras Lambe 1902
Subor. †Ceratopsia Marsh 1890 [ceratopsian]
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Fm. †Ceratopsidae Marsh 1888 [ceratopsid]
Fm. †Protoceratopsidae Granger and Gregory 1923
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G. †Leptoceratops Brown 1914
Fm. †Psittacosauridae Osborn 1923
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G. †Psittacosaurus Osborn 1923
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†Psittacosaurus youngi Chao 1962
Invalid names: Protiguanodon Osborn 1923 [synonym]
G. †Stenopelix Meyer 1857
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†Stenopelix valdensis Meyer 1857