Biceps
Bivalves are collectively called mollusks belonging to the bivalve. It has two symmetrical shells. It has two symmetrical shells. Because there is no head part, there is not tactile · repair, but there is eye structure which is called inside of coat in the edge of mantle part. The legs are shaped like axes and are suitable for digging into the bottom of the water or the ground. There are two pairs of wide gills. There are about 30,000 species including shellfishes, oysters, clams, mussels, cockles, jellyfish, red tastes, walnut shells, scallops, marbles, long square shells and pearl shells.