Classification of Goodwin et al. 1998

Subor. †Pachycephalosauria Maryanska and Osmolska 1974
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Fm. †Pachycephalosauridae Sternberg 1945
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Subfm. †Domocephalinae Sereno 1986
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G. †Pachycephalosaurus Brown and Schlaikjer 1943
G. †Prenocephale Maryanska and Osmolska 1974
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]