Reptilia - Dinosauria - Pachycephalosauridae

Full reference: R. M. Sullivan. 2003. Revision of the dinosaur Stegoceras Lambe (Ornithischia, Pachycephalosauridae). Journal of Vertebrate Paleontology 23(1):181-207

Parent taxon: Pachycephalosauridae according to R. M. Sullivan 2006

Sister taxa: Acrotholus, Alaskacephale, Amtocephale, Colepiocephale, Hanssuesia, Pachycephalosaurinae, Pachycephalosaurus, Prenocephale, Stegoceras, Stygimoloch, Texacephale, Tylocephale, Domocephalinae, Gravitholus albertae

Subtaxa: Dracorex

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Ecology: ground dwelling herbivore