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 Branchiostegi Linnaeus, 1758
             Genus Syngnathus Linnaeus, 1758 - pipefish
               1 Syngnathus typhle Linnaeus, 1758 - broad-nosed pipefish
               2 Syngnathus acus Linnaeus, 1758 - common pipefish
               3 Syngnathus pelagicus Linnaeus, 1758 - pelagic pipefish
               4 Syngnathus aequoreus Linnaeus, 1758 see Entelurus aequoreus (C. Linnaeus, 1758)
               5 Syngnathus ophidion Linnaeus, 1758 see Nerophis ophidion (C. Linnaeus, 1758)
               6 Syngnathus barbarus Linnaeus, 1758 see Nerophis ophidion (C. Linnaeus, 1758)
               7 Syngnathus hippocampus Linnaeus, 1758 see Hippocampus hippocampus (C. Linnaeus, 1758)