Classification of Sullivan 2003

G. †Gravitholus Wall and Galton 1979
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†Gravitholus albertae Wall and Galton 1979
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Fm. †Pachycephalosauridae Sternberg 1945
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Subfm. †Pachycephalosaurinae Sereno 1997
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G. †Colepiocephale Sullivan 2003
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†Colepiocephale lambei Sternberg 1945
G. †Hanssuessia Sullivan 2003
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†Hanssuessia sternbergi Brown and Schlaikjer 1943
Unr. †Pachycephalosaurini Sullivan 2003
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G. †Pachycephalosaurus Brown and Schlaikjer 1943
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G. †Stygimoloch Galton and Sues 1983
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†Stygimoloch spinifer Galton and Sues 1983
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Invalid names: Stenotholus kohleri Giffin et al. 1988 [synonym]
Invalid names: Stenotholus Giffin et al. 1988 [synonym]
G. †Prenocephale Maryańska and Osmólska 1974
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†Prenocephale brevis Lambe 1918
†Prenocephale edmontonensis Brown and Schlaikjer 1943
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Invalid names: Sphaerotholus buchholtzae Williamson and Carr 2003 [synonym]
†Prenocephale goodwini Williamson and Carr 2003
†Prenocephale prenes Maryańska and Osmólska 1974
Invalid names: Sphaerotholus Williamson and Carr 2003 [synonym]
G. †Stegoceras Lambe 1902
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†Stegoceras validum Lambe 1902
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Invalid names: Ornatotholus browni Wall and Galton 1979 [synonym]
Invalid names: Ornatotholus Galton and Sues 1983 [synonym]
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