Bivalves or lamellibranchs are molluscs that have an outer shell with two articulated valves and gills in the form of lamellae. Molluscs are soft-bodied animals (from the Latin mollis = soft), generally protected by a shell which can be simple, with plates or with two valves. They have gills or lungs and a muscular foot, transformed in cephalopods into tentacles.
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