Functions
Perhaps the most essential function of the operculum in gastropods is to allow snails to resist drying out, or desiccation. This is very important in intertidal marine snails during low tide, and this also enables operculate freshwater and land snails to survive periods of drought and dry weather.
In those marine species where the operculum completely seals the shell, it can also serve as a protection against predators when the snail body is retracted.
Read more about this topic: Operculum (gastropod)
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The outward functions of intelligent man.”
—William Wordsworth (1770–1850)