👉 Salmonlouse is a type of mollusk, commonly known as "mushrooms," that are part of the order Gymnodion invertebrate phylum. They are characterized by their round, flattened bodies with long, slender tentacles and an elongated body at the end of their snout. Salmonlouses are found throughout the world, from tropical to temperate regions, but they occur primarily in freshwater environments such as rivers, lakes, and streams.