Imperium naturæ C. Linnaeus, 1758 - nature
   Mundus Plinius - physical world
     naturalia - natural bodies
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758
           Order Abdominales Linnaeus, 1758
             Genus Esox Linnaeus, 1758
               1 Esox sphyraena Linnaeus, 1758 see Sphyraena sphyraena (C. Linnaeus, 1758)
               2 Esox osseus Linnaeus, 1758 see Lepisosteus osseus (C. Linnaeus, 1758)
               3 Esox vulpes Linnaeus, 1758 see Albula vulpes (C. Linnaeus, 1758)
               4 Esox synodus Linnaeus, 1758 see Synodus synodus (C. Linnaeus, 1758)
               5 Esox lucius Linnaeus, 1758 - American pike
               6 Esox hepsetus Linnaeus, 1758 see Anchoa hepsetus (C. Linnaeus, 1758)
               7 Esox bellone Linnaeus, 1758 see Esox belone Linnaeus, 1758
               8 Esox brasiliensis Linnaeus, 1758 see Hemiramphus brasiliensis (C. Linnaeus, 1758)
               9 Esox gymnocephalus Linnaeus, 1758