Order †Pachycephalosauria Maryañska & Osmólska, 1974 see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974 Family †Pachycephalosauridae Sternberg, 1945 Genus †[Colepiocephale] Sullivan, 2003 †Colepiocephale lambei (Sternberg, 1945)