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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.
Types of Mollusk: Snails, Bivalves, Squid, and More. Most people think of mollusks as slow-moving creatures, like snails, or animals that hardly move at all, like mussels. This is only part of the picture. The oceans of the world were once dominated by schools of predatory mollusks called ammonites with sharp beaks and a surprising turn of speed.