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 Testacea Linnaeus, 1758
             Genus Helix Linnaeus, 1758
               * Ancipites, testa longitudinaliter utrinque angulata
               ** Carinatae anfractibus margine acuto
               *** Rotundatae anfractibus & umbilicatae
               **** Rotundatae imperforatae
               ***** Oblongae turritae imperforatae