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†family Pachycephalosauridae Sternberg 1945 (ornithischian)

Reptilia - Ornithischia

Invalid subtaxa: Gravitholus Wall and Galton 1979 [nomen dubium], Stegoceras bexelli Bohlin 1953 [nomen dubium], Tholocephalidae Sereno 1986, Troodon bexell Bohlin 1953 [nomen dubium], Troodon bexelli Bohlin 1953 [nomen dubium]

Full reference: C. M. Sternberg. 1945. Pachycephalosauridae proposed for dome-headed dinosaurs, Stegoceras lambei, n. sp., described. Journal of Paleontology 19(5):534-538

Parent taxon: Pachycephalosauria according to F.-L. Han et al. 2012

Sister taxa: Goyocephale, Goyocephalia, Homalocephale, Homalocephalidae, Pachycephalosauroidea, Qiyunshanpus, Stenopelixidae, Tianchungosauroidea, Wannanosaurus

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

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Ecology: ground dwelling herbivore