Infraphylum Tetrapoda Goodrich, 1930 see Clade Tetrapoda Hatschek & Cori 1896 [Laurin 2020]
   Superclass Amniota Haeckel, 1866 see Clade Amniota Haeckel 1866 [Laurin & Reisz 2020]
     Paraclass Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
       Parasubclass Diapsida Osborn, 1903 [paraphyletic] - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
         Parainfraclass Archosauria Cope, 1869 [paraphyletic] see Clade Archosauria Cope 1869 [Gauthier & Padian 2020]
           Parasuperorder †Theropodomorpha Olshevsky, 1991 [paraphyletic]
             Paraorder †Theropoda Marsh, 1881 [paraphyletic]
               Suborder †Ornithomimosauria Barsbold, 1976 see Clade Ornithomimosauria Barsbold 1976 [Osmólska 1997]
                 Family †Ornithomimidae Marsh, 1890
                   Genus †"Arkansaurus" Quinn, 1973, nom. ined., nom. dub. see Genus Arkansaurus Hunt & Quinn, 2018