Narrow-hinge astarte (Astarte montagui)

Distribution data supplied by the Ocean Biodiversity Information System (OBIS). To interrogate UK data visit the NBN Atlas.Map Help



The shell of Tridonta montagui is broadly oval in outline, with prominent umbones centred on the mid-line, and can grow up to 1.5 cm long. The outer surface is white with a thick brownish periostracum, and sculptured with 30 to 40 fine, raised concentric ridges. The inner shell margin is smooth.

Recorded distribution in Britain and Ireland

Most frequent off the north and west coasts of Britain but also recorded in the north-east.

Global distribution



Found in sand and fine gravel from the sublittoral to depths of around 100 m.

Depth range


Identifying features

  • Broadly oval, equivalve shell with prominent umbones centred on the mid-line.
  • White in colour, with a thick, light or dark brown periostracum.
  • Sculpture of about 30-40 broad concentric ridges and fine concentric lines.
  • Distinct, elongate lunule.
  • Right valve with two cardinal teeth; the anterior broad, ridged or bifid and the posterior indistinct.
  • Left valve with three cardinal teeth; two anterior teeth of equal size and the third posterior tooth poorly developed and often appearing absent.
  • Adductor scars and pallial line indistinct.
  • Inner shell margin smooth.

Additional information

No text entered

Listed by

- none -


  1. Hayward, P., Nelson-Smith, T. & Shields, C. 1996. Collins pocket guide. Sea shore of Britain and northern Europe. London: HarperCollins.

  2. Hayward, P.J. & Ryland, J.S. (ed.) 1995b. Handbook of the marine fauna of North-West Europe. Oxford: Oxford University Press.

  3. Howson, C.M. & Picton, B.E., 1997. The species directory of the marine fauna and flora of the British Isles and surrounding seas. Belfast: Ulster Museum. [Ulster Museum publication, no. 276.]

  4. JNCC (Joint Nature Conservation Committee), 1999. Marine Environment Resource Mapping And Information Database (MERMAID): Marine Nature Conservation Review Survey Database. [on-line]

  5. Picton, B.E. & Costello, M.J., 1998. BioMar biotope viewer: a guide to marine habitats, fauna and flora of Britain and Ireland. [CD-ROM] Environmental Sciences Unit, Trinity College, Dublin.

  6. Tebble, N., 1976. British Bivalve Seashells. A Handbook for Identification, 2nd ed. Edinburgh: British Museum (Natural History), Her Majesty's Stationary Office.


  1. Conchological Society of Great Britain & Ireland, 2018. Mollusc (marine) data for Great Britain and Ireland - restricted access. Occurrence dataset: accessed via on 2018-09-25.

  2. Conchological Society of Great Britain & Ireland, 2018. Mollusc (marine) records for Great Britain and Ireland. Occurrence dataset: accessed via on 2018-09-25.

  3. Kent Wildlife Trust, 2018. Kent Wildlife Trust Shoresearch Intertidal Survey 2004 onwards. Occurrence dataset: accessed via on 2018-10-01.

  4. Merseyside BioBank., 2018. Merseyside BioBank (unverified). Occurrence dataset: accessed via on 2018-10-01.

  5. NBN (National Biodiversity Network) Atlas. Available from:

  6. OBIS (Ocean Biodiversity Information System),  2024. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. Accessed: 2024-07-21


This review can be cited as:

Farrell, C. 2006. Astarte montagui Narrow-hinge astarte. In Tyler-Walters H. and Hiscock K. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 21-07-2024]. Available from:

Last Updated: 26/01/2006