Order Testudines Wagler, 1830 - turtles
   Suborder Cryptodira Cope, 1868
     Superfamily Testudinoidea Batsch, 1788
       Family Emydidae Rafinesque, 1815 - pond turtles
         Subfamily Deirochelyinae Agassiz, 1857
           Genus Malaclemys Gray, 1844 [monotypic]
             Malaclemys terrapin (Schoepff, 1793) - diamondback terrapin
               1 Malaclemys terrapin terrapin (Schoepff, 1793) - northern diamondback terrapin
               2 Malaclemys terrapin centrata (Latreille, 1801) - Carolina diamondback terrapin
               3 Malaclemys terrapin littoralis Hay, 1905 - Texas diamondback terrapin
               4 Malaclemys terrapin macrospilota Hay, 1905 - ornate diamondback terrapin
               5 Malaclemys terrapin pileata (Wied, 1865) - Mississippi diamondback terrapin
               6 Malaclemys terrapin rhizophorarum Fowler, 1906 - mangrove diamondback terrapin
               7 Malaclemys terrapin tequesta Schwartz, 1955 - Eastern Florida diamondback terrapin