Archosauria - Dinosauria - Pachycephalosauridae

Synonym: Tylosteus Leidy 1872

Full reference: B. Brown and E. M. Schlaikjer. 1943. A study of the troödont dinosaurs with the description of a new genus and four new species. Bulletin of the American Museum of Natural History 82(5):115-150

Parent taxon: Pachycephalosauridae according to R. K. Schott et al. 2009

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

Subtaxa: Pachycephalosaurus wyomingensis

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Type: Pachycephalosaurus grangeri

Ecology: ground dwelling herbivore