The shape of the shell is triangular and oval, and the shell is hard and thick. The difference between this species and Meretrix meretrix is that the rear edge of the shell is significantly longer than the front edge, and the rear edge is pointed at the end. The shell top is located slightly in front of the center of the back edge, and the front and rear edges of the shell top intersect at an angle of 90 °. The leading edge and ventral edge of the shell are round. The small lunar surface is not obvious in small individuals, but obvious in large individuals; The lintel is broad. Ligaments are short and thick, brown and protruding from the shell surface. The shell surface is swollen and smooth, covered with a layer of cream or cream paint like shell skin, brown or purple ribbons or patterns near the top of the shell, or the whole shell surface is covered with brown dotted line patterns, which vary greatly.