BIOTIC Species Information for Halidrys siliquosa
Researched byDr Harvey Tyler-Walters & Paolo Pizzolla Data supplied byMarLIN
Refereed byDr Stefan Kraan
Distribution and Habitat
Distribution in Britain & IrelandWidely distributed and fairly common in the Britain and Ireland.
Global distributionRestricted to the north east Atlantic, and recorded from northern Norway, Scandinavia, the Baltic Sea, Helgoland and the Netherlands south to the Bay of Biscay, north Portugal and the Canary Islands (John et al., 2004).
Biogeographic rangeNot researched Depth rangeIntertidal to 4 m
MigratoryNon-migratory / Resident   
Distribution Additional InformationOn wave sheltered shores Halidrys siliquosa occur in the sublittoral and rock pools at low water. However, on wave exposed sites Halidrys siliquosa may also be found in deep high shore rock pools sheltered from the sun (Moss & Lacey, 1963). It is in such rock pools where the very weak water flow rate is likely to occur.

Substratum preferencesBedrock
Large to very large boulders
Small boulders
Physiographic preferencesOpen coast
Strait / sound
Ria / Voe
Enclosed coast / Embayment
Biological zoneMid Eulittoral
Lower Eulittoral
Sublittoral Fringe
Upper Infralittoral
Wave exposureExposed
Moderately Exposed
Very Sheltered
Tidal stream strength/Water flowModerately Strong (1-3 kn)
Weak (<1 kn)
Very Weak (negligible)
SalinityFull (30-40 psu)
Variable (18-40 psu)
Habitat Preferences Additional Information
Distribution References Fish & Fish, 1996, Dickinson, 1963, Norton, 1985, Hayward et al., 1996, Gibson et al., 2001, Lüning, 1990, JNCC, 1999, Picton & Costello, 1998, Lewis, 1964, Lüning, 1990, Guiry & Nic Dhonncha, 2002, Hardy & Guiry, 2003, Guiry & Nic Dhonncha, 2002, John et al., 2004,
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