Order Testudines Wagler, 1830 - turtles
Ref: P.P. van Dijk et al., 2014: 339; 330
   Suborder Cryptodira Cope, 1868
  Ref: P.P. van Dijk et al., 2014: 339; 330
     Superfamily Testudinoidea Batsch, 1788
    Ref: P.P. van Dijk et al., 2014: 339, 353; 330
       Family Emydidae Rafinesque, 1815 - pond turtles
      Ref: P.P. van Dijk et al., 2014: 339, 353; 330
         Subfamily Deirochelyinae Agassiz, 1857
        Ref: P.P. van Dijk et al., 2014: 339, 353; 330
           Genus Graptemys Agassiz, 1857
          Ref: P.P. van Dijk et al., 2014: 354
             Graptemys nigrinoda Cagle, 1954 - black-knobbed map turtle
            Ref: P.P. van Dijk et al., 2014: 356
               1 Graptemys nigrinoda nigrinoda Cagle, 1954 - northern black-knobbed map turtle
              Ref: P.P. van Dijk et al., 2014: 356
               2 Graptemys nigrinoda delticola Folkerts & Mount, 1969 - southern black-knobbed map turtle
              Ref: P.P. van Dijk et al., 2014: 356