Classification of Maryanska 1990
†Heishansaurus pachycephalus Bohlin 1953
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†Stegosaurus madagascariensis Piveteau 1926
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Subor. †Pachycephalosauria Maryańska and Osmólska 1974
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Fm. †Pachycephalosauridae Sternberg 1945
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G. †Pachycephalosaurus Brown and Schlaikjer 1943
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†Pachycephalosaurus wyomingensis Gilmore 1931
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Invalid names: Pachycephalosaurus grangeri Brown and Schlaikjer 1943 [synonym], Pachycephalosaurus reinheimeri Brown and Schlaikjer 1943 [synonym], Tylosteus ornatus Leidy 1872 [synonym]
Invalid names: Tylosteus Leidy 1872 [synonym]
G. †Stegoceras Lambe 1902
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†Stegoceras edmontonense Brown and Schlaikjer 1943
†Stegoceras validum Lambe 1902
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Invalid names: Stegoceras breve Lambe 1918 [synonym], Stegoceras lambei Sternberg 1945 [synonym], Troodon sternbergi Brown and Schlaikjer 1943 [synonym]
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]
Invalid names: Heishansaurus Bohlin 1953 [nomen dubium], Homalocephalidae Dong 1978 [empty]