Clam Clam Clam, the shell is large and oval, with a shell height of 52~76mm, a shell length of 7 1~95mm and a shell width of 35 ~ 46 mm.. The shell is extremely thick. The top of the shell protrudes forward of the back edge, and the two top of the shell are in contact. The crescent surface is not obvious, and the shield surface is covered by the outer ligament, which is prominent and dark brown. The front edge of the shell is round, the belly edge is flat, and the rear edge is slightly truncated. When the two shells are closed, 1 slit openings are reserved on the ventral side of the leading edge and the trailing edge, 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 stout, and the fourth one extends backward, which 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 2 teeth on the front side of the right shell, which are relatively weak and triangular. The surface of the shell is protruding, 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 shell surface is gray, earthy or stained with rust. The inner surface of the shell is dark purple with pearl luster. All kinds of adductor muscle marks are obvious, and the anterior and posterior adductor muscle marks are almost the same size, all of which are semicircular; The sinus of the coat is thick, almost reaching the center of the shell. The water pipe is long, healed and covered with a muddy skin. Living in the sediment or gravel bed near the low tide line to the shallow sea below the low tide line. It is 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. In addition to fresh food, cooking, soup, but also dry. Its body fluid contains anti-hemophilia active ingredients, which can prolong the survival time of leukemia patients. The catering industry in Dalian and Yantai is often regarded as high-grade seafood. Its shell is used as medicine, mainly containing calcium carbonate, shell keratin, etc., and has the functions of softening and resolving hard mass, clearing away heat and resolving phlegm, and can be used for scrofula, cough, excessive phlegm, chest pain, bleeding, metrorrhagia and leukorrhagia and external sores.