Hydrobiidae, commonly known as mud snails, is a large cosmopolitan family of very small freshwater and brackish water snails with an operculum; they are in the order Littorinimorpha.
Oxychilus is a genus of small air-breathing land snails, terrestrial pulmonate gastropods in the subfamily Oxychilinae of the family Oxychilidae, the glass snails.
Cochlostoma is a genus of land snails with an operculum, terrestrial gastropod mollusks in the family Cochlostomatidae.
Hauffenia is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae.
Hydrobia is a genus of very small brackish water snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
Pseudamnicola is a genus of small brackish water snails with an operculum, aquatic gastropod mollusks in the subfamily Pseudamnicolinae of the family Hydrobiidae.
Pupisoma is a genus of minute, air-breathing land snails, terrestrial pulmonate gastropod molluscs or micromollusks in the family Valloniidae.
Retinella is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Gastrodontidae.
Subulina is a genus of small tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Achatinidae.
Valvata is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Valvatidae, the valve snails.
Xerocrassa is a genus of small, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the subfamily Helicellinae of the family Geomitridae.
Iglica is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Moitessieriidae.
Islamia is a genus of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
Streptaxis is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Streptaxidae.
Truncatelloidea is a superfamily of snails, gastropod mollusks in the clade Caenogastropoda.
Oospira is a genus of terrestrial gastropods belonging to the subfamily Phaedusinae of the family Clausiliidae.
Potomida is a genus of bivalves belonging to the subfamily Gonideinae of the family Unionidae.
