BIOTIC Species Information for Pholas dactylus
Researched byJacqueline Hill Data supplied byMarLIN
Refereed byDr Eunice Pinn
Distribution and Habitat
Distribution in Britain & IrelandPholas dactylus occurs in Britain from Kent along the south and south-west coasts including south Wales, Anglesey and Solway. Also recorded from several sites on the east coasts of Yorkshire and Northumbria and southwest Ireland.
Global distributionDistributed from Britain south to the Iberian Peninsula, the Mediterranean and Black Sea and the Atlantic coast of Morocco.
Biogeographic rangeNot researched Depth rangeTo 35 m
MigratoryInsufficient information   
Distribution Additional InformationAll boring bivalves begin excavation following settling of the larva and slowly enlarge and deepen the burrow with growth. They are forever locked within their burrows, and only the siphons project to the small surface opening (Barnes, 1980). Individuals in waterlogged wood are quite rare and often deformed (E. Pinn pers. comm.).

Substratum preferencesBedrock
Artificial (e.g. metal/wood/concrete)
Physiographic preferencesOpen coast
Strait / sound
Enclosed coast / Embayment
Biological zoneLower Eulittoral
Sublittoral Fringe
Wave exposureInsufficient information
Tidal stream strength/Water flowInsufficient information
SalinityFull (30-40 psu)
Habitat Preferences Additional Information
Distribution References Hayward & Ryland, 1995b, Tebble, 1976, Barnes, 1980, Wood, 1984, Seaward, 1990, Seaward, 1993, Seaward, 1982,
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