Pachycephalosauridae Bipedal, herbivorous/omnivorous ornithischian dinosaurs with thick, heavily ossified skulls many of which were surrounded by nodes and/or spikes.
(Taxonomic Rank: Family)

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	Alaskacephale   Family: Pachycephalosauridae Colepiocephale   Family: Pachycephalosauridae Dracorex   Family: Pachycephalosauridae Goyocephale   Family: Pachycephalosauridae Gravitholus   Family: Pachycephalosauridae Hanssuesia   Family: Pachycephalosauridae Homalocephale   Family: Pachycephalosauridae Micropachycephalosaurus   Family: Pachycephalosauridae Pachycephalosaurus   Family: Pachycephalosauridae Prenocephale   Family: Pachycephalosauridae Stegoceras   Family: Pachycephalosauridae Stygimoloch   Family: Pachycephalosauridae Texacephale   Family: Pachycephalosauridae Tylocephale   Family: Pachycephalosauridae Wannanosaurus   Family: Pachycephalosauridae
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