|General Information||Taxonomy and identification||General biology||Habitat preferences and distribution||Reproduction and longevity||Sensitivity||Importance|
Image Keith Hiscock - Group of individuals. Image width ca XX cm.
Image copyright information
Semibalanus balanoides is not listed under any importance categories.
|Researched by:||Nicola White||Refereed by:||Prof. Alan J. Southward|
|Phylum||Arthropoda||Arthropods, joint-legged animals, e.g. insects, crustaceans & spiders|
|Class||Maxillopoda||Barnacles, copepods and fish lice|
|Recorded distribution in Britain and Ireland||All coasts of Britain & Ireland, but sometimes is absent or rare in south-west Cornwall, the Isles of Scilly and south west Ireland.|
|Habitat information||Semibalanus balanoides is a dominant member of the eulittoral fauna of British rocky shores. It can be found on shores of all exposure and typically occurs in a zone below Chthamalus montagui, although the two can overlap. It may extend into the lower reaches of estuaries as it can tolerate salinities down to 20 psu.|
|Description||Semibalanus balanoides is the most widespread intertidal barnacle in the British Isles. It may grow up to 15 mm in diameter and has 6 calcified grey-white shell plates. It may be distinguished from other barnacles by the presence of a diamond shaped opercular aperture and a membranous shell base. The barnacle feeds on zooplankton when immersed, by extending the thoracic appendages (cirri). It is a cross fertilizing hermaphrodite and may live for up to 8 years, depending on its position on the shore.|
This review can be cited as follows:
Nicola White 2008. Semibalanus balanoides. An acorn barnacle. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 25/05/2013]. Available from: <http://www.marlin.ac.uk/speciesfullreview.php?speciesID=4328>