1, the appearance of morphology: the appearance of the American shellfish is fan-shaped, the color is usually yellowish, brown or gray, the surface of its shell has obvious radial lines, appear more delicate. The appearance of the clam is like a small scallop, translucent, its body parts are more like blades.

2, size: the adult shell length of the American shellfish can usually reach more than 10 centimeters, larger than the clam. The clam's shell is about 3 centimeters long, ovoid in shape, with a purple edge.

3, nutritional composition: the nutritional composition of the shellfish and clams also have some differences. The protein content of the U.S. shellfish is higher, containing about 16.4 grams of protein per 100 grams. And clams contain about 18.6 grams of protein per 100 grams, slightly higher than the U.S. shellfish.

4, geographic distribution: the American shellfish mainly live in the Indo-Pacific waters of the mudflats, in China's Fujian Changle Zhanggang also has a wide distribution. The clams live in the shallow seabed, common in Hainan area.