Shellfish classification

There are many kinds of shellfish, the common ones are ark shell, salamander, snail, conch, clam, clam, etc.

The main organ of the excretory system is the kidney. The kidney is formed by a ciliated renal tube, one end communicates with the surrounding heart cavity, and the other end opens in the outer sleeve cavity. The number of kidneys varies from type to type, with 6 pairs, 2 pairs, 1 pair or only 1 pair. In addition to the kidneys, some types of glands surrounding the wall of the heart cavity or part of the liver also have excretory functions.

The reproductive system includes the gonads, reproductive ducts, cross-connectors and some accessory glands. Hermaphrodite or hermaphrodite.