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
               Oblongae turritae imperforatae
                 608 Helix decollata Linnaeus, 1758
                 609 Helix pupa Linnaeus, 1758
                 610 Helix barbara Linnaeus, 1758
                 611 Helix amarula Linnaeus, 1758
                 612 Helix stagnalis Linnaeus, 1758 see Lymnaea stagnalis (C. Linnaeus, 1758)
                 613 Helix fragilis Linnaeus, 1758
                 614 Helix putris Linnaeus, 1758
                 615 Helix limosa Linnaeus, 1758
                 616 Helix tentaculata Linnaeus, 1758 see Bithynia tentaculata (C. Linnaeus, 1758)
                 617 Helix auricularia Linnaeus, 1758
                 618 Helix balthica Linnaeus, 1758
                 619 Helix neritoidea Linnaeus, 1758
                 620 Helix perspicua Linnaeus, 1758
                 621 Helix haliotoidea Linnaeus, 1758
                 622 Helix ambigua Linnaeus, 1758