Classification of Sues and Galton 1987

Tylosteus ornatus Leidy 1872
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G. †Tylosteus Leidy 1872
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Marginocephalia Sereno 1986
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Subor. †Ceratopsia Marsh 1890
Subor. †Pachycephalosauria Maryanska and Osmolska 1974
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Fm. †Homalocephalidae Dong 1978
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G. †Goyocephale Perle et al. 1982
G. †Homalocephale Maryanska and Osmolska 1974
G. †Wannanosaurus Hou 1977
Fm. †Pachycephalosauridae Sternberg 1945
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G. †Gravitholus Wall and Galton 1979
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Gravitholus albertae Wall and Galton 1979
G. †Majungatholus Sues and Taquet 1979
G. †Ornatotholus Galton and Sues 1983
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Ornatotholus browni Wall and Galton 1979
G. †Pachycephalosaurus Brown and Schlaikjer 1943
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Invalid names: Pachycephalosaurus grangeri Brown and Schlaikjer 1943 [synonym], Pachycephalosaurus reinheimeri Brown and Schlaikjer 1943 [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 brevis 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
G. †Yaverlandia Galton 1971
Infraor. †Pachycephalosauria Maryanska and Osmolska 1974
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Invalid names: Troodon bexelli Bohlin 1953 [nomen dubium]