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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 born with a small, soft, colorless shell called a protoconch, which then grows as the snail grows. Since snail shells are made up mostly of calcium carbonate, snails tend to have a very calcium-rich diet.Of interest, Stomatella snails are often mistaken for snails that are out of their shells, since Stomatella snails have transparent shells.owever, it can happen by accident, which usually leads to the snail dying. It's thought to be possible that some snails could live without their shells, until they form a new one, but this is considered unlikely.