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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.
A young conch snail has a very spiky shell, perhaps to help protect from predators. As the animal ages these sharp edges are smoothed. This type of snail may live to be as old as 40 years. Not all marine gastropods live this long, but all produce larvae that grow into adults over a period of time.