Classification of Evans et al. 2018
G. †Pachycephalosaurus Brown and Schlaikjer 1943
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†Pachycephalosaurus wyomingensis Gilmore 1931
G. †Stegoceras Lambe 1902
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†Stegoceras novomexicanum Jasinski and Sullivan 2011
†Stegoceras validum Lambe 1902
G. †Prenocephale Maryańska and Osmólska 1974
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†Prenocephale prenes Maryańska and Osmólska 1974
G. †Tylocephale Maryańska and Osmólska 1974
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†Tylocephale gilmorei Maryańska and Osmólska 1974
G. †Homalocephale Maryańska and Osmólska 1974
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†Homalocephale calathocercos 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