Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Class Reptilia Linnaeus, 1758 - reptiles
       Subclass Anapsida Osborn, 1903 - anapsids
         Order Testudines Wagler, 1830 - turtles
           Suborder Cryptodira Cope, 1868
             Family †Baenidae Romer, 1956
             Family Carettochelyidae Boulenger, 1887 - pignose turtles
             Family Cheloniidae Oppel, 1811
             Family Chelydridae Gray, 1831 - snapping turtles
             Family Dermatemydidae Gray, 1870 - Mesoamerican river turtles
             Family Dermochelyidae Fitzinger, 1843 - leatherback seaturtles
             Family †Glyptopsidae Marsh, 1890
             Family †Kayentachelyidae Gaffney et al., 1987
             Family Kinosternidae Agassiz, 1857 - mud and musk turtles
             Family †Meiolaniidae Lydekker, 1887
             Family †Protostegidae Cope, 1873
             Family Testudinidae Batsch, 1788 - tortoises
             Family †Toxochelyidae Hay, 1902
             Family Trionychidae Gray, 1825 - softshell turtles