Most bivalves eat by filtering microscopic plants and animals from the water. Most gastropods and cephalopods have teeth called radula that they rasp over food as the first stage of digestion. Next Question 6. Queen Conchs are found in the Atlantic Ocean. Tiger cowries and spider conchs are both found in the tropical Pacific.
Abalone live in the Pacific Ocean and are collected for food.
Next Question 5. About half of all mollusk species have probably been identified. Next Question 4. Crustaceans are not a class of mollusk. Lobsters and crayfish are two types of crustaceans.