Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Class Reptilia Linnaeus, 1758 - reptiles
       1.1 Subclass Anapsida Osborn, 1903 - anapsids
       1.2 Subclass Testudinata Oppel, 1811 - testudinates
       2 Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903
       3.1 Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
       3.2 Subclass †Ichthyopterygia Blainville, 1835 - ichthyopterygians