†unranked clade Eupachycephalosauria Dieudonné et al. 2020 (ornithischian)
Full reference: P.-E. Dieudonné, P. Cruzado-Caballero, P. Godefroit and T. Tortosa. 2020. A new phylogeny of cerapodan dinosaurs. Historical Biology
Parent taxon: Pachycephalosauria according to P.-E. Dieudonné et al. 2020
Sister taxa: Goyocephale, Goyocephalia, Homalocephalidae, Pachycephalosauridae, Pachycephalosauroidea, Qiyunshanpus, Tianchungosauroidea, Tianyulong, Wannanosaurus
Subtaxa: Homalocephale Pachycephalosaurus Prenocephale Stegoceras
Ecology: ground dwelling herbivore
Distribution:
• Cretaceous of Canada (22: Alberta, Saskatchewan collections), Mongolia (6), United States (51: Colorado, Montana, New Mexico, North Dakota, South Dakota, Texas, Wyoming)
Total: 79 collections including 82 occurrences