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
               Rotundatae imperforatae
                 602 Helix janthina Linnaeus, 1758
                 603 Helix vivipara Linnaeus, 1758
                 604 Helix nemoralis Linnaeus, 1758 see Cepaea nemoralis (C. Linnaeus, 1758)
                 605 Helix lucorum Linnaeus, 1758
                 606 Helix grisea Linnaeus, 1758
                 607 Helix haemastoma Linnaeus, 1758