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.
Alzoniella hartwigschuetti is a species of spring snail, an aquatic gastropod in the family Hydrobiidae.
Alzoniella is a genus of minute freshwater spring snails, aquatic gastropod mollusks or micromollusks in the subfamily Islamiinae of the family Hydrobiidae.
Alzoniella pyrenaica is a species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to France.
Moitessieria is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Moitessieriidae.
Platyla maasseni is a species of very small land snail with an operculum, a terrestrial gastropod mollusc or micromollusc in the family Aciculidae. This species is endemic to Serbia and Montenegro.
Platyla peloponnesica is a species of very small land snail with an operculum, a terrestrial gastropod mollusc or micromollusc in the family Aciculidae. This species is endemic to Greece.
Renea gormonti is a species of land snail with an operculum, a terrestrial gastropod mollusk in the family Aciculidae. This species is endemic to France.
Renea paillona is a species of land snail in the family Aciculidae. It is native to France and Italy.
Alzoniella slovenica is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae, which are sometimes known as the snouted water snails.
Mercuria is a genus of small brackish water snails or freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
Moitessieriidae is a family of small freshwater snails, aquatic gastropod molluscs in the superfamily Truncatelloidea.
Islamia is a genus of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
Alzoniella iberopyrenaica is a species of very small aquatic snail, a spring snail, an operculate gastropod mollusc in the family Hydrobiidae.
Alzoniella marianae is a species of very small aquatic snail, a spring snail, an operculate gastropod mollusc in the family Hydrobiidae.
Navarriella elliptica is a species of very small aquatic snail, a spring snail, an operculate gastropod mollusc in the family Hydrobiidae.
Xerocrassa edmundi is a species of air-breathing land snail, a pulmonate gastropod mollusk in the family Geomitridae.
