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. †Goyocephale Perle et al. 1982
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Goyocephale lattimorei Perle et al. 1982
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. †Pachycephalosaurus Brown and Schlaikjer 1943
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G. †Prenocephale Maryańska and Osmólska 1974
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Prenocephale prenes Maryańska and Osmólska 1974
G. †Sphaerotholus Williamson and Carr 2003
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Sphaerotholus buchholtzae Williamson and Carr 2003
Sphaerotholus goodwini Williamson and Carr 2003
G. †Stygimoloch Galton and Sues 1983
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Stygimoloch spinifer Galton and Sues 1983
G. †Tylocephale Maryańska and Osmólska 1974
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Tylocephale gilmorei Maryańska and Osmólska 1974
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]
G. †Stenopelix Meyer 1857
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Stenopelix valdensis Meyer 1857
G. †Wannanosaurus Hou 1977
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G. †Yaverlandia Galton 1971
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Yaverlandia bitholus Galton 1971