Is part of topic Natural Environment at Te Papa
Molluscs include terrestrial snails and slugs, sea slugs, chitons, shellfish - bivalves and univalves, tusk shells, octopuses and squid, and the "living fossil" group known as monoplacophorans. Although diverse morphologically, molluscs exhibit a variety of common characteristics, including a soft body (usually) surrounded by some sort of shell secreted by the mantle and a strong muscular foot used for locomotion. The shell may be external or internal or secondarily lost.
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