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.
Moitessieria is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Moitessieriidae.
Platyla is a genus of very small land snails with an operculum, terrestrial gastropod mollusks or micromollusks in the family Aciculidae.
Zospeum is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Ellobiidae, the salt marsh snails.
Hydrobia acuta neglecta is a European subspecies of small brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Islamia is a genus of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
Mikro is a genus of sea snails, marine gastropod mollusks in the family Skeneidae.
Seila is a genus of minute sea snails, marine gastropod molluscs or micromolluscs in the family Cerithiopsidae.
Austropeplea is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Lymnaeidae, the pond snails.
Terraconia rolani is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Terraconia is a genus of very small freshwater snails with an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
Zospeum percostulatum is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Ellobiidae, the salt marsh snails. This species is endemic to Asturias, Spain. It is known from several limestone caves near Llanes. Though there were a few old records of Zospeum in Asturias, dubiously identified as Z. suarezi and Z. schaufussi, Zospeum percostulatum is the first species described for this autonomous community.
Helodiamea is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Pyramidellidae, the pyrams and their allies.
Palaospeum is a genus of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Moitessieriidae.
