Order †Ornithischia Seeley, 1887
Count: -
   Parvorder †Genasauria Sereno, 1986 see Clade Genasauria Sereno 1986
  Count: -
     Nanorder †Cerapoda Sereno, 1986 see Suborder Cerapoda Sereno, 1986
    Count: -
       Hypoorder †Marginocephalia Sereno, 1986 see Clade Marginocephalia Sereno 1986
      Count: -
         Suborder †Pachycephalosauria Maryañska & Osmólska, 1974 see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974
        Count: -
           1 Genus †Wannanosaurus Hou, 1977
          Count: -
           2 Infraorder †Goyocephalia Sereno, 1986 see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974
          Count: -