list of all the known pachycephalosaurs:(Some may turn out to be juvinile animals of a larger species)Pachycephalosaurus, Stenopelix, Wannanosaurus, Goyocephale, Stegoceras, Homalocephale, Tylocephale, Sphaerotholus, Prenocephale, Dracorex and Stygimoloch.
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