†unranked clade Pachycephalosauria Maryanska and Osmolska 1974
Full reference: T. Maryanska and H. Osmolska. 1974. Pachycephalosauria, a new suborder of ornithischian dinosaurs. Palaeontologia Polonica 30:45-102
Parent taxon: Marginocephalia according to F.-L. Han et al. 2012
Sister taxon: Ceratopsia
Subtaxa: Goyocephale, Goyocephalia, Homalocephale, Homalocephalidae, Pachycephalosauridae, Pachycephalosauroidea, Stenopelixidae, Tianchungosauroidea, Wannanosaurus