Freshwater snails are gastropod mollusks that live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs to major rivers. Did you know that freshwater snails exist in a wide variety of habitats and can be found all over the world? From small springs to major rivers, these gastropod mollusks play an important role in freshwater ecosystems.