Classification of Watabe et al. 2011

G. †Stegoceras Lambe 1902
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Stegoceras novomexicanum Jasinski and Sullivan 2011
Stegoceras validum Lambe 1902
G. †Prenocephale Maryanska and Osmolska 1974
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Prenocephale brevis Lambe 1918
Prenocephale edmontonensis Brown and Schlaikjer 1943
Prenocephale goodwini Williamson and Carr 2003
Prenocephale prenes Maryanska and Osmolska 1974
Dinosauria Owen 1842 [dinosaur]
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Superor. †Ornithischia Seeley 1888 [ornithischian]
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Fm. †Pachycephalosauridae Sternberg 1945
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G. †Amtocephale Watabe et al. 2011
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Amtocephale gobiensis Watabe et al. 2011
Invalid names: Texacephale Longrich et al. 2010 [nomen dubium]