1, the appearance of different

green clam: shell medium-sized, ligament external, located in the back. There are 3 main teeth plus anterior lateral teeth. Double closed shell muscles. Setline bay triangular or rounded or lacking. Shell is inflated and rounded, rounded at the anterior end and slightly cuneate at the posterior end, the ventral margin of the shell is slightly pointed in the center.

Clams: clam shell length 2.5-5.7 cm. Commercial size averages 40 millimeters. It is a common shellfish. The shell is strong, with equal right and left shell flaps; unequal sides, with the rostrum at the top of the shell located in the anterior half; slightly oval in shape. The ligaments are embedded and do not protrude from the surface of the shell, and the broad, brown, elliptical arch of the body extends almost halfway to the posterior margin.

2, different habitats and environments

Green clams: habitat in estuaries or sandy and muddy shallow water, the depth of the water is about four to five meters deep, with its strong and powerful axe-footed sneaking, usually will be out of the water pipe to exchange oxygen and suck food.

Clam: The Philippine clam inhabits intertidal coarse sand and small gravel beaches and subtidal muddy bottoms. It usually inhabits quiet waters. From the intertidal zone to 4 meters deep. Mostly in the inner bay with less wind and waves, and a moderate amount of fresh water injection in the middle and low-tide areas, but the salinity of the coastal islands and a few meters deep subtidal, also occasionally found.

3, different distribution areas

Green clams: the world distribution is distributed in Japan and mainland China, Taiwan's production of western estuaries or sandy mud substrate in the waters of the majority.

Clams: Philippine curtain clams have a greater commercial value, have been introduced to the world, and have been permanently colonized there. Accidentally introduced to the Pacific coast of North America in the 1930s along with long giant oyster fry, the Philippine clam has spread and colonized the coast from California to British Columbia.