淡水螺, or freshwater snails, are small mollusks that inhabit freshwater environments such as rivers, lakes, and ponds. They have a coiled shell and play an important role in the ecosystem by helping to break down organic matter and serving as a food source for various animals. These snails are known for their diverse species, with some being popular in aquariums and others considered pests in agriculture. Freshwater snails can also be hosts for certain parasites, which can affect both wildlife and humans, making their study important in environmental and health sciences.