What's the name of the freshwater clam?

mussels.

mussels are a kind of animals in mollusca (Unionidae), which are called mussel shells and tortoises in some places. They live at the bottom of freshwater lakes, ponds, rivers, etc. and are semi-buried in sediment. Meat is edible, and can also be used as bait for fish and poultry and feed for poultry and livestock.

freshwater pearl mussels are used in some areas, and Hyriopsis cumingii and Cremastra plicata are mainly used for pearl cultivation. The water inlet and outlet pipes at the back end of the mussel body are exposed, so that water can flow in and out of the jacket cavity, so as to complete the functions of feeding, breathing, excreting feces and metabolites, filtering tiny organisms and organic particles in the water, and eating small microorganisms.

Extended information:

Morphological characteristics

The shell shapes are varied, and the two shells are equal. The engravings on the top of the shell are often concentric or polygonal, but somewhat degraded. The hinge changes greatly and sometimes has quasi-main teeth. With 1 external ligament. The septa of branchial leaves are intact and arranged in parallel with gill filaments, and the posterior part of the outer leaf of the outer gill heals with the mantle, with branchial aqueduct. The opening of gill and anus is completely distinguished by diaphragm. ?

There are ligaments on the outside, and the shell can be opened by its elasticity. There are muscle marks attached to muscles on the inside of the shell. Coat marks parallel to the belly edge of the shell; There are 3 muscle marks on the upper front of the shell, and the largest one is oval, which is the muscle mark of the anterior closed shell; A slightly triangular forefoot muscle mark with a small angle on its upper edge; The lower edge of it is the extensor muscle mark.

There are some differences between male and female bodies, and there is a bulge on the abdominal edge, which is related to reproduction and is the temporary residence of larvae.

Baidu encyclopedia-mussel