Order †Pachycephalosauria Maryañska & Osmólska, 1974 see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974 Family †Pachycephalosauridae Sternberg, 1945 Genus †[Micropachycephalosaurus] Dong, 1978, nom. dub. 1 †Micropachycephalosaurus hongtuyanensis Dong, 1978, nom. dub.