Order †Pachycephalosauria Maryañska & Osmólska, 1974
see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974
Family †Pachycephalosauridae Sternberg, 1945
†Pachycephalosaurini Sullivan, 2003
Genus †[Dracorex] Bakker, R. Sullivan, Porter, P. Larson & Saulsbury, 2006
1 †Dracorex hogwartsia Bakker, Sullivan, Porter, Larson & Saulsbury, 2006