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
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 Maryanska and Osmolska 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 Maryanska and Osmolska 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 Maryanska and Osmolska 1974
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Tylocephale gilmorei Maryanska and Osmolska 1974
G. †Goyocephale Perle et al. 1982
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Goyocephale lattimorei Perle et al. 1982