1, white clam: white clam is a kind of oyster, but the grain is different from that of flower clam. The flower clam has a longitudinal pattern, while the white clam has a pattern similar to that of the pearl oyster. In addition, the pearl oyster is nearly quadrangular, with swollen sides, protruding top shell, milky white top shell and a brown circle at the opening.
2. Green clam: The pearl shell of green clam is slightly round, with a length of 3~5cm, a height of 3~5cm and a thickness of about 0.5 mm The shell surface is white or blue-white. The top of the shell is tilted to one side, and the top of the shell is the management center, and it is in the same boat with layers and closely arranged. There may be several blue-gray wheel lines along this line, with fine teeth on the belly edge and ivory or bluish white inside the shell. Smooth and texture-free. It is light, hard and slightly brittle, and the layering of the section is not obvious. The smell is slightly fishy and the taste is light.
3, the old man's head clam: the old man's head clam, also known as the prince's shell, this shell is round and juicy, fresh and refreshing.
4. Meretrix meretrix: Meretrix meretrix, also known as Meretrix meretrix, is generally called Meretrix variegata or Meretrix Thais, and its shell is 2.5-5.7 cm long. The average business scale of commercial services is 40mm. It is a common shellfish. The shell is firm, and the shell petals are consistent from top to bottom; The two sides are different, and the beak at the top of the shell is located in the upper part; The shape is slightly oval. The cruciate ligament is embedded, and the shell surface is not prominent. The thick and deep brown elliptical arc of the human body is basically widened to half of the back edge.
5. Meretrix meretrix, also known as Meretrix meretrix, stinkbug family (Hā n-Zi), stinkbug family (fěn-náo) and white clam, belongs to Cladocera of bivalves and is one of the key edible shellfish.