Sea clam is a kind of marine shellfish. Molluscs. Two kinds of shells, long and narrow in shape, yellow outside and white inside, live in coastal seawater and can also be cultured artificially, with delicious meat. There are cricket and cricket.

Chēng is pronounced "Tan" in Minnan and "Qing" in Ou. Razor clams are common in intertidal sediments (especially in temperate zones). The shell is long and narrow, razor-shaped, up to 20 cm (8 inches). Axes are big and active, and can move up and down quickly in caves, and quickly shrink into caves when they are frightened. Feed food particles in seawater with a short tube. Some species can swim short distances by spraying water through water pipes. Siliquapatula along the Pacific coast of North America does not live in a fixed cave, but in the quicksand of the beach that is constantly washed away by the waves.