†Stygimoloch Galton and Sues 1983 (ornithischian)
Reptilia - Dinosauria - Pachycephalosauridae
Synonym: Stenotholus Giffin et al. 1988
Full reference: P. M. Galton and H.-D. Sues. 1983. New data on pachycephalosaurid dinosaurs (Reptilia: Ornithischia) from North America. Canadian Journal of Earth Sciences 20(3):462-472
Parent taxon: Pachycephalosauridae according to R. K. Schott et al. 2009
Sister taxa: Acrotholus, Alaskacephale, Amtocephale, Colepiocephale, Hanssuesia, Pachycephalosaurinae, Pachycephalosaurini, Pachycephalosaurus, Prenocephale, Stegoceras, Texacephale, Tylocephale, Domocephalinae, Gravitholus albertae
Subtaxa: Stygimoloch spinifer
Type: Stygimoloch spinifer
Ecology: ground dwelling herbivore