Caspia is a genus of marine snails, brackish water snails and freshwater snails with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. Caspia is the type genus of the Caspiidae, that is a synonym of Pyrgulinae.
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.
Corbicula is a genus of freshwater and brackish water clams, aquatic bivalve mollusks in the family Cyrenidae, the basket clams. The genus name is the Neo-Latin diminutive of Latin corbis, a basket, referring to the shape and ribs of the shell.
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.
Pisidium is a genus of very small or minute freshwater clams known as pill clams or pea clams, aquatic bivalve molluscs in the family Sphaeriidae, the pea clams and fingernail clams.
Gyraulus is a genus of small, mostly air-breathing, freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails.
Pseudamnicola is a genus of small brackish water snails with an operculum, aquatic gastropod mollusks in the subfamily Pseudamnicolinae of the family Hydrobiidae.
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.
Pyrgula is a genus of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Pontiturboella is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae.
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.
Choanomphalus 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.
Euglesa is a genus of bivalves belonging to the family Sphaeriidae.
Caspiohydrobia is a genus of gastropods belonging to the family Hydrobiidae.
Microcolpia is a genus of gastropods belonging to the family Melanopsidae.
Horatia is a genus of gastropod molluscs, comprising a small group of minute stygobiont freshwater snails with valvatoid shells, belonging to the subfamily Horatiinae of the family Hydrobiidae.
