Gastropoda

The gastropods, more commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca, called Gastropoda. This class includes snails and slugs of all species and sizes, from microscopic to Achatina achatina, the largest known land gastropod. Many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs, live on Earth. https://en.wikipedia.org/wiki/Gastropoda