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
           1 Suborder †Proganochelydia
           2 Suborder †Amphichelydia (Lydekker, 1889)
           3 Suborder Cryptodira Cope, 1868
           4 Suborder Pleurodira Cope, 1864