[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
         Branch Craniata Linnaeus, 1758
           Grade Gnathostoma
             Subgrade Pentadactyla lipobranchia
               Branch Monocondyla
                 Class Reptilia Linnaeus, 1758 - reptiles
                   Subclass Chelonia Brongniart, 1800 see Class Chelonia Brongniart, 1800
                     Genus Trionyx Geoffroy Saint-Hilaire, 1809