Phylum [Vertebrata] (Lamarck, 1801)
   Class Reptilia Linnaeus, 1758 - reptiles
     1 Subclass Anapsida Osborn, 1903 - anapsids
     2 Subclass Testudinata Oppel, 1811 - testudinates
     3 Subclass †uncertain
     4 Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
     5 Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903