Order Testudines Wagler, 1830 - turtles
   Suborder Cryptodira Cope, 1868
     1 Family Chelydridae Gray, 1831 - snapping turtles
     2 Superfamily Chelonioidea Oppel, 1811
     3 Superfamily Kinosternoidea Agassiz, 1857
     4 Superfamily Testudinoidea Batsch, 1788
     5 Superfamily Trionychoidea Gray, 1825