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• Domain: Eukaryota () - Whittaker & Margulis,1978 - eukaryotes
  • Kingdom: Animalia () - Linnaeus, 1758 - animals
    • Subkingdom: Bilateria () - (Hatschek, 1888) Cavalier-Smith, 1983
      • Branch: Deuterostomia () - Grobben, 1908
        • Infrakingdom: Chordonia () - (Haeckel, 1874) Cavalier-Smith, 1998
          • Phylum: Chordata () - Bateson, 1885 - Chordates
            • Subphylum: Vertebrata () - Cuvier, 1812 - Vertebrates
              • Infraphylum: Gnathostomata () - Auct. - Jawed Vertebrates
                • Superclass: Tetrapoda () - Goodrich, 1930
                  • Class: Reptilia () - Reptiles
                    • Subclass: Crocodylomorpha () - Hay, 1930 (Walker, 1968)
                      • Infraclass: Archosauromorpha ()
                        • Order: Crocodylia () - Gmelin, 1789
                          • Suborder: Eusuchia ()
                            • Family: Crocodylidae ()
                              • Genus: Alligator ()
                                • Specific name: olseni
                                  • Scientific name: - Alligator olseni