Meretrix meretrix has a large oval shell with a height of 52~76mm, a length of 7 1~95mm, a width of 35 ~ 46 mm and an extremely thick shell. The top of the shell protrudes forward of the rear edge, and the two tops of the shell are in contact. The crescent surface is not obvious, and the shield surface is covered by the outer ligament, protruding and dark brown. The front edge of the shell is round, the belly edge is flat, and the back edge is slightly truncated. When the two shells are closed, 1 slit openings are reserved on the ventral sides of the front and rear edges, which are the protruding holes of the axe foot and the water pipe respectively. The hinge is wide, and the left shell has four main teeth, the first one is the shortest, the second one is thin, the third one is the tallest and the fourth one is the oldest. There are 3 main teeth in the right shell, the first one is pointed, the second one is spoon-shaped, the third one is inclined backward, and the top end is notched with 1; There are two teeth on the front side of the right shell, which are relatively weak and triangular. The shell surface is convex, without radial ribs, and the growth line is thick, which is arranged concentrically from the top of the shell to the edge of the shell. The surface of the shell is gray, earthy or rusty. The inner surface of the shell is dark purple with pearl luster. All kinds of adductor signs are obvious, and the size of anterior and posterior adductor signs is similar, all of which are semicircular; The concave part of the coat is very thick, almost reaching the center of the shell. The water pipe was long, healed and covered with a layer of mud. Living in the sediment or gravel layer near the low tide line to the shallow sea below the low tide line. Only distributed in Dalian, Yantai and Weihai at the mouth of Bohai Sea.
The meat of this product is nutritious and delicious, and contains protein, fat, betaine, liver sugar, vitamins A, B and D, etc. Besides fresh food, cooking and soup are also dry. Its body fluid contains anti-hemophilia active ingredients, which can prolong the survival time of leukemia patients. The restaurants in Dalian and Yantai are often regarded as high-grade seafood. Its shell is used as medicine, mainly containing calcium carbonate and chitin. Has the effects of softening hard mass, resolving hard mass, clearing away heat and resolving phlegm, and can be used for treating scrofula, cough, excessive phlegm, chest pain, hemorrhage, metrorrhagia, leukorrhagia and external ulcer.