Reptilia - Dinosauria - Pachycephalosauridae

Synonyms: Hanssuessia Sullivan 2003, Hansuessia Sullivan 2003

Full reference: L. M. Lambe. 1902. New genera and species from the Belly River Series (mid-Cretaceous). Geological Survey of Canada Contributions to Canadian Palaeontology 3(2):25-81

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

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

Subtaxa: Stegoceras novomexicanum, Stegoceras validum

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Type: Stegoceras validus

Ecology: ground dwelling herbivore