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The carnivorous snails have tongues that are covered with thousands of tiny teeth to tear apart food. The gastropod fossils from Jacksboro, TX shown below are from the Pennsylvanian, Finis formation, and these gastropods lived about 300 million years ago.
Snails are effectively slugs that have a strong, spherical shell attached to their back, which they use as a form of protection and compact accommodation. Snails and slugs share a common genetic bodily structure but are classed as two significant species; a slug is not a snail without a shell, as is often misidentified.