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 Apodes Linnaeus, 1758 see Order Anguilliformes Rafinesque, 1810
             119 Genus Muraena Linnaeus, 1758
             120 Genus Gymnotus Linnaeus, 1758
             121 Genus Trichiurus Linnaeus, 1758
             122 Genus Anarhichas Linnaeus, 1758
             123 Genus Ammodytes Linnaeus, 1758
             124 Genus Stromateus Linnaeus, 1758
             125 Genus Xiphias Linnaeus, 1758