Classification of Galton 1971
Subor. †Ornithopoda Marsh 1881 [ornithopod]
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Fm. †Pachycephalosauridae Sternberg 1945
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G. †Pachycephalosaurus Brown and Schlaikjer 1943
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†Pachycephalosaurus grangeri Brown and Schlaikjer 1943
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Invalid names: Pachycephalosaurus reinheimeri Brown and Schlaikjer 1943 [synonym], Pachycephalosaurus wyomingensis Gilmore 1931 [synonym]
G. †Stegoceras Lambe 1902
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†Stegoceras edmontonensis Brown and Schlaikjer 1943
†Stegoceras validus Lambe 1902