Order †Ornithischia Seeley, 1887
   Parvorder †Genasauria Sereno, 1986 see Clade Genasauria Sereno 1986
     Nanorder †Thyreophora Nopcsa, 1915 see Suborder Thyreophora Nopcsa, 1915
       Hypoorder †Thyreophoroidea Nopcsa, 1928 see [unranked] Thyreophoroidea Nopcsa, 1928
         Minorder †Eurypoda Sereno, 1986 see Clade Eurypoda Sereno 1986
           Suborder †Ankylosauria Osborn, 1923 see Infraorder Ankylosauria Osborn, 1923
             Family †Ankylosauridae Brown, 1908
               Subfamily †Ankylosaurinae Brown, 1908
                 Genus †Euoplocephalus Lambe, 1910