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 Testudinoidea Batsch, 1788
                         Family Emydidae Rafinesque, 1815 - pond turtles
                           1 Genus Graptemys Agassiz, 1857
                           2 Genus Terrapene Merrem, 1820
                           3 Genus Malaclemys Gray, 1844
                           4 Subfamily Platysterninae Romer, 1956 see Family Platysternidae Gray, 1869
                           5 Subfamily Batagurinae Gray, 1869 see Subfamily Geoemydinae Theobald, 1868
                           6 Subfamily Emydinae Rafinesque, 1815
                           7 Genus Platysternon Gray, 1831