Order †Pachycephalosauria Maryañska & Osmólska, 1974 see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974 Family †Pachycephalosauridae Sternberg, 1945 Genus †Prenocephale Maryañska & Osmólska, 1974 †Prenocephale edmontonensis (Brown & Schlaikjer, 1943) R.M. Sullivan, 2000