Class Reptilia Linnaeus, 1758 - reptiles
   Subclass Anapsida Osborn, 1903 - anapsids
     Order Chelonia Brongniart, 1800 see Class Chelonia Brongniart, 1800
       Suborder Cryptodira Cope, 1868
         Superfamily Trionychoidea Gray, 1825
           1 Family Dermatemydidae Gray, 1870 - Mesoamerican river turtles
           2 Family Kinosternidae Agassiz, 1857 - mud and musk turtles
           3 Family Carettochelyidae Boulenger, 1887 - pignose turtles
           4 Family Trionychidae Gray, 1825 - softshell turtles