Hydrobia acuta neglecta
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. Distribution. This species which has a distribution type: oceanic temperate occurs on the coasts of the North Sea, in countries and islands including: Ecology. "Hydrobia acuta neglecta" occurs in coastal lagoons where incoming freshwater dilutes sea water. The preferred salinity range is 10-24 ‰. Status. The status of this taxon is uncertain. "Hydrobia neglecta" is treated as a full species in Fauna Europaea, but in 1995 it had been suggested that  H. neglecta is a synonym of the Mediterranean "Hydrobia acuta" (Draparnaud). Then a "neglecta" colony in northern France was shown to be "acuta". In 2000 a molecular study concluded that north-west European populations were not specifically distinct from the Mediterranean "Hydrobia acuta" and designated them subspecies "neglecta" Muus.