living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         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 Casichelydia (Gaffney, 1975) see Order Casichelydia Gaffney, 1975
                     Infraorder Cryptodira Cope, 1868 see 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 Trionychidae Gray, 1825 - softshell turtles
                         4 Family Carettochelyidae Boulenger, 1887 - pignose turtles