Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Reptilia Linnaeus, 1758 - reptiles
     1 Subclass Anapsida Osborn, 1903 - anapsids
     2 Subclass Testudinata Oppel, 1811 - testudinates
     3 Order †Placodontia Owen, 1859, incertae sedis
     4 Order †Plesiosauria Blainville, 1835, incertae sedis - plesiosaurs
     5 Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
     6 Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903