Classification of Maryanska and Osmólska 1985

Or. †Ornithischia Seeley 1888 [ornithischian]
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Subor. †Ankylosauria Osborn 1923 [ankylosaur]
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. †Microceratops Bohlin 1953
Fm. †Psittacosauridae Osborn 1923
Fm. †Heterodontosauridae Romer 1966 [heterodontosaurid]
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G. †Heterodontosaurus Crompton and Charig 1962
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†Heterodontosaurus tucki Crompton and Charig 1962
Subor. †Ornithopoda Marsh 1881 [ornithopod]
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G. †Lesothosaurus Galton 1978
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Subor. †Pachycephalosauria Maryańska and Osmólska 1974
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G. †Goyocephale Perle et al. 1982
G. †Homalocephale Maryańska and Osmólska 1974
G. †Majungatholus Sues and Taquet 1979
G. †Prenocephale Maryańska and Osmólska 1974
G. †Stegoceras Lambe 1902
G. †Wannanosaurus Hou 1977
Subor. †Stegosauria Marsh 1877