MOLLUSCA : Littorinimorpha : HydrobiidaeSNAILS, SLUGS, ETC.

Hydrobia acuta neglecta Muus, 1963

Lagoon mud snail


Hydrobia acuta neglecta image: hydrobia_acuta
Hydrobia acuta neglecta

Description: A tiny mud snail, 4 - 6 mm in size, with a sharp pointed spire with relatively flattened whorls and shallow sutures. It has an operculum. The shell is usually dark in colour, and the animal itself has a grey body with some large pale spots and a darker head with white tentacles featuring a black ring near the tip.

Habitat: Around the coast in brackish lagoons or pools separated from the sea.

Distribution: Rare in Britain and Ireland. Only known from Strangford Lough in Northern Ireland.

Similar Species: Could potentially be confused with several other species of mud snail.

Key Identification Features:

  • Sharp pointed spire and dark shell.
  • Grey body/snout with pale spots.
  • White tentacles with black ring near tip.
  • Dark-coloured head.

Distribution Map from NBN: Hydrobia acuta neglecta at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Hydrobia acuta neglecta at iNaturalist World Species Observations database.

WoRMS: Hydrobia acuta neglecta at World Register of Marine Species.

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 Picton, B.E., Keatley, L. & Morrow, C.C. (2026). Hydrobia acuta neglecta. Muus, 1963. [In] Encyclopedia of Marine Life of Britain and Ireland.
https://habitas.org/mbdp/species.php?item=W2700. Accessed on 2026-11-01