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  Animalia
    Bilateria
     Deuterostomia
      Chordata
        Vertebrata
         Gnathostomata
          Osteichthyes
            Actinopterygii
              Neopterygii
                Teleostei
                  Protacanthopterygii
                    Esociformes
                           [Esocoidei]
                            Esocidae
                                     Esox
                                             Esox americanus
                                               Esox americanus americanus
                                               Esox americanus vermiculatus
                                             Esox cancila
                                             Esox lucius
                                             Esox masquinongy
                                                   [Esox ohiensis]
                                             Esox niger
                                             Esox panchax
                                             Esox reichertii
                                                   [Esox reicherti]
                                             Esox synodus