Hydrobia acuta neglecta is a European subspecies of small brackish water snail with a gill and an operculum, an aquatic gastropod mollusc in the family Hydrobiidae.

[2] This species which has a distribution type: oceanic temperate occurs on the coasts of the North Sea, in countries and islands including: Hydrobia acuta neglecta occurs in coastal lagoons where incoming freshwater dilutes sea water.

Hydrobia neglecta is treated as a full species in Fauna Europaea,[4] but in 1995 it had been suggested that H. neglecta is a synonym of the Mediterranean Hydrobia acuta (Draparnaud).

[5] Then a neglecta colony in northern France was shown to be acuta.

[6] 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.