According to relevant data, Chaoshan red egg is called sand clam, also called sea clam, red egg and Xishiguan. Its meat is tender and delicious, and can be eaten fresh. According to the local purchase price, about 30 yuan a catty.

Sand clam inhabits the bottom of sand or sand mud sediment waters at a depth of 20 meters from the intertidal zone. Cave life, the depth can reach 7 to 10 cm. The main food is diatoms. China's coastal areas are all distributed, with a large number in the southern Yellow Sea and the East China Sea.