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 Vermes Linnaeus, 1758 - worms see Phylum Vermes (C. Linnaeus, 1758)
           Order Mollusca Linnaeus, 1758 see Phylum Mollusca Linnaeus, 1758
             Genus Priapus Linnaeus, 1758, nom. rej. see Genus Priapulus Lamarck, 1816
               Priapus equinus Linnaeus, 1758 see Actinia equina (Linnaeus, 1758)