Classification of Giffin 1989
G. †Pachycephalosaurus Brown and Schlaikjer 1943
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†Pachycephalosaurus wyomingensis Gilmore 1931
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Invalid names: Pachycephalosaurus reinheimeri Brown and Schlaikjer 1943 [synonym], Tylosteus ornatus Leidy 1872 [synonym]
G. †Stegoceras Lambe 1902
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†Stegoceras edmontonense Brown and Schlaikjer 1943
†Stegoceras validum Lambe 1902