Classification of Williamson and Carr 2003
G. †Ornatotholus Galton and Sues 1983
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†Ornatotholus browni Wall and Galton 1979
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†Gravitholus albertae Wall and Galton 1979
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†Stegoceras edmontonense Brown and Schlaikjer 1943
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Subor. †Pachycephalosauria Maryańska and Osmólska 1974
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G. †Homalocephale Maryańska and Osmólska 1974
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†Homalocephale calathocercos Maryańska and Osmólska 1974
Fm. †Pachycephalosauridae Sternberg 1945
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Subfm. †Pachycephalosaurinae Sereno 1997
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G. †Sphaerotholus Williamson and Carr 2003
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†Sphaerotholus buchholtzae Williamson and Carr 2003
†Sphaerotholus goodwini Williamson and Carr 2003
G. †Stegoceras Lambe 1902
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†Stegoceras brevis Lambe 1918
†Stegoceras lambei Sternberg 1945
†Stegoceras sternbergi Brown and Schlaikjer 1943
†Stegoceras validum Lambe 1902
Invalid names: Gravitholus Wall and Galton 1979 [synonym]