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.
Planorbidae, common name the ramshorn snails or ram's horn snails, is a family of air-breathing freshwater snails, aquatic pulmonate gastropod molluscs. Unlike most molluscs, the blood of ram's horn snails contains iron-based hemoglobin instead of copper-based hemocyanin. As a result, planorbids are able to breathe oxygen more efficiently than other molluscs. The presence of hemoglobin gives the body a reddish colour. This is especially apparent in albino animals.
Planorbis is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails, or planorbids. All species in this genus have sinistral or left-coiling shells.
Lymnaeidae, common name the pond snails, is a taxonomic family of small to large air-breathing freshwater snails, aquatic pulmonate gastropod mollusks, that belong to the clade Hygrophila.
Acroloxidae, commonly known as river limpets, are a taxonomic family of very small, freshwater snails, aquatic pulmonate gastropod limpet-like mollusks with a simple flattened conical shell in the clade Hygrophila.
Gyraulus is a genus of small, mostly air-breathing, freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails.
Theodoxus is a genus of nerites, small water snails with an operculum, some of which live in freshwater, and some in both freshwater and brackish water, aquatic gastropod mollusks in the family Neritidae, the nerites.
Amnicolidae is a family of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the superfamily Rissooidea.
Anisus is a genus of small air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the subfamily Planorbinae of the family Planorbidae, the ramshorn snails and their allies.
Lithoglyphidae is a family of small freshwater snails with gills and an operculum, aquatic gastropod mollusks.
Parafossarulus is a genus of freshwater snails with gills and an operculum, an aquatic prosobranch gastropod mollusks in the family Bithyniidae.
Pyrgula is a genus of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Benedictia is a genus of freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Lithoglyphidae.
Turricaspia is a genus of aquatic snails which includes marine snails, brackish water snails and freshwater snails which all have a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae. Turricaspia is the type genus of the Turricaspiinae, which is a synonym of Pyrgulinae.
Truncatelloidea is a superfamily of snails, gastropod mollusks in the clade Caenogastropoda.
Megalovalvata baicalensis is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Valvatidae, the valve snails.
Choanomphalus maacki is a species of freshwater air-breathing snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids.
Choanomphalus amauronius is a species of freshwater air-breathing snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids.
Maackia is a genus of freshwater snails with an operculum, an aquatic gastropod mollusk in the family Amnicolidae.
