Full reference: T. Maryańska and H. Osmólska. 1974. Pachycephalosauria, a new suborder of ornithischian dinosaurs. Palaeontologia Polonica 30:45-102
Parent taxon: Marginocephalia according to A. O. Fonseca et al. 2024
See also Benton 1990, Buchholz 2002, Butler et al. 2007, Butler et al. 2008, Carroll 1988, Cooper 1985, Dieudonné et al. 2020, Dodson 1990, Han et al. 2012, Maryańska and Osmólska 1974, Maryanska and Osmólska 1985, Olshevsky and Ford 1994, Peng et al. 2001, Russell 1984, Sereno 1986, Sereno 1997, Sereno 1998, Sereno 1999, Sereno 2000, Sues and Galton 1987, Weishampel 2004, Woodruff et al. 2025, Xu et al. 2006 and Zhao 1983
Sister taxon: Ceratopsia
Subtaxa: Eupachycephalosauria Goyocephale Goyocephalia Homalocephalidae Pachycephalosauridae Pachycephalosauroidea Qiyunshanpus Tianchungosauroidea Wannanosaurus Zavacephale
Ecology: ground dwelling herbivore