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 †Nodosauridae Marsh, 1890
               Genus †Hylaeosaurus Mantell, 1832