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
               1 Priapus equinus Linnaeus, 1758 see Actinia equina (Linnaeus, 1758)
               2 Priapus humanus Linnaeus, 1758 see Priapulus caudatus de Lamarck, 1816