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Opistobranch gastropods gallery

Sea hare and Sea slugs

Opisthobranchs are marine gastropod molluscs that have the common characteristic of having gills at the back of the heart. Some have a shell which is generally hidden by the mantle (sea hares), others have no shell at all (sea slugs). 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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