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Onchidium is a genus of air-breathing sea slugs, shell-less marine pulmonate gastropod mollusks in the family Onchidiidae

It is found in rocks, mudflats, reeds and mangrove swamps along estuarine coasts. The stone is mainly distributed in the estuarine waters of the Indo-Pacific coast, and the domestic is mostly distributed in the East China Sea and the South China Sea. Shisulfonate is an omnivorous and vegetative shellfish, which relies on the teeth and tongues found in its mouth ball to extract food. The composition of food is benthic diatom, organic debris, sediment, humus and so on.

The small organisms and organic debris carried by the tides and other large amounts of food precipitated by the silting promotion of the reed become the food of the stone sulfonate. The amount of stone sulphate swallowed is very large, generally while eating, its feces are rice granules, its feeding and locust worms resemble, so in the search for stone sulphate must first find its feces.