Dinosauria Owen 1841 [Padian & May 1993], nom. cl. inval. see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020]
Status: extant
   †Ornithischia Seeley 1887 [Padian & May 1993] see Order Ornithischia Seeley, 1887
  Status: fossil
     †Genasauria Sereno 1986
    Status: fossil
       †Neornithischia Cooper 1985
      Status: fossil
         †Marginocephalia Sereno 1986
        Status: fossil
           †Pachycephalosauria Maryañska & Osmólska 1974 see Infraorder Pachycephalosauria Maryañska & Osmólska, 1974
          Status: fossil
             Genus †Goyocephale Perle, Maryanska & Osmólska, 1982
            Status: fossil