whelk
A marine snail with a spirally coiled external shell; aperture closed off by a chitinous covering (operculum) once head and body are drawn inside; single gill present in mantle cavity; most species are carnivores or scavengers. (Class: Gastropoda. Order: Neogastropoda.)
Portions of the summary below have been contributed by Wikipedia.
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A whelk is a large marine gastropod (snail) found in temperate waters.
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