Classification of Williamson et al. 2009

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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Invalid names: Dracorex hogwartsia Bakker et al. 2006 [synonym], Stygimoloch spinifer Galton and Sues 1983 [synonym]
Invalid names: Dracorex Bakker et al. 2006 [synonym]
G. †Prenocephale Maryańska and Osmólska 1974
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†Prenocephale prenes Maryańska and Osmólska 1974
G. †Stegoceras Lambe 1902
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†Stegoceras validum Lambe 1902
G. †Tylocephale Maryańska and Osmólska 1974
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†Tylocephale gilmorei Maryańska and Osmólska 1974
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
G. †Wannanosaurus Hou 1977
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G. †Sphaerotholus Williamson and Carr 2003
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†Sphaerotholus buchholtzae Williamson and Carr 2003
G. †Alaskacephale Sullivan 2006
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†Alaskacephale gangloffi Sullivan 2006