Order Testudines Wagler, 1830 - turtles
   Suborder Pleurodira Cope, 1864
     Family Chelidae Gray, 1825
       Subfamily Chelinae Gray, 1825
         Genus Platemys Wagler, 1830
           Platemys platycephala (Schneider, 1792) - twist-necked turtle
             1 Platemys platycephala platycephala (Schneider, 1792) - eastern twist-necked turtle
             2 Platemys platycephala melanonota Ernst, 1984 - black-backed twist-necked turtle