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]
           Superorder †Sauropodomorpha Huene, 1932 see Order Sauropodomorpha Huene, 1932
             Order †Segnosauria Barsbold & Perle, 1980 see Suborder Segnosauria Barsbold & Perle, 1980
               Family †Segnosauridae Perle, 1979 see Family Therizinosauridae Maleev, 1954
                 1 Genus †Enigmosaurus Barsbold & Perle, 1983
                 2 Genus †Erlikosaurus Perle, 1980
                 3 Genus †Segnosaurus Perle, 1979