Hydrobiids
Hydrobiids are small freshwater snails that belong to the family Hydrobiidae, a diverse group within the class Gastropoda. They occur in freshwater and brackish environments worldwide, and many species have highly restricted distributions, often confined to a single water body such as a spring, stream, river, or cave pool. The name is commonly used for members of this family and, in some contexts, for closely related lineages.
Morphologically, hydrobiids are typically only a few millimeters in size. Their shells are usually elongated with
Ecologically, hydrobiids favor clean, well-oxygenated waters and are often found in springs, seepages, streams, and cave
Taxonomically, the Hydrobiidae have undergone substantial revision, and the boundaries between hydrobiid genera and related families