Ghost claw snail, a kind of barnacles, belongs to marine arthropods, and is also called dog claw snail because of its appearance resembling dog claws. The dog claw snail is a kind of shellfish that grows in the cracks of the sea. Generally, many dog-claw snails grow in groups, cling to the cracks in stones, remain motionless for many years, and grow by eating microorganisms in water. The dog claw snail is the fattest in winter. A single dog claw snail is not much thicker than the thumb, about two or three inches long. It is precisely because the dog claw snail is so delicious that people only picked it before and did not pay attention to protection. There are fewer and fewer dog claw snails on the island now. In order to protect rare shellfish, the collection of dog claw snails has been banned in Wanshan District.