Natura - nature
   actualia - actual entities
     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)
                 [Priapus humanus Linnaeus, 1758] see Priapulus caudatus de Lamarck, 1816