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 †Basitheropoda Olshevsky, 1991 [paraphyletic]
               Family †Megalancosauridae Olshevsky, 1991
                 1 ?Genus †Cosesaurus Ellenberger & de Villalta, 1974
                 2 Genus †Megalancosaurus Calzavara, Muscio & Wild, 1980