Order Testudines Wagler, 1830 - turtles
   Suborder Cryptodira Cope, 1868
     Superfamily Testudinoidea Batsch, 1788
       Family Emydidae Rafinesque, 1815 - pond turtles
         Subfamily Emydinae Rafinesque, 1815
           Genus Terrapene Merrem, 1820
             1 Terrapene carolina (Linnaeus, 1758) - eastern box turtle
             2 Terrapene coahuila Schmidt & Owens, 1944 - Coahuilan box turtle
             3 Terrapene nelsoni Stejneger, 1925 - spotted box turtle
             4 Terrapene ornata (Agassiz, 1857) - ornate box turtle