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
             Subclass Testudinata Oppel, 1811 [monotypic] - testudinates
               Order Chelonia Brongniart, 1800 see Class Chelonia Brongniart, 1800
                 Suborder Cryptodira Cope, 1868
                   Superfamily Chelonioidea Oppel, 1811
                     1 Family †Plesiochelyidae Rütimeyer, 1873
                     2 Family †Protostegidae Cope, 1873
                     3 Family †Toxochelyidae Hay, 1902
                     4 Family Dermochelyidae Fitzinger, 1843 - leatherback seaturtles
                     5 Family Cheloniidae Oppel, 1811
                     6 Family †Thalassemyidae