Archosauria - Dinosauria - Pachycephalosauridae

Full reference: R. M. Sullivan. 2003. Hanssuesia, the correct generic name for 'Hanssuessia' Sullivan, 2003. Journal of Vertebrate Paleontology 23(3):714

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

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

Subtaxa: Hanssuesia sternbergi

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Ecology: ground dwelling herbivore