Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
             1 Subclass Anapsida Osborn, 1903 - anapsids
             2 Subclass Testudinata Oppel, 1811 [monotypic] - testudinates
             3 Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
             4 Order †Ichthyopterygia Blainville, 1835 [coordinate rank]
             5 Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903