Image Jim Anderson - Onchidoris bilamellata. Image width ca 4 cm.
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Onchidoris bilamellata is not listed under any importance categories.
|Phylum||Mollusca||Snails, slugs, mussels, cockles, clams & squid|
|Class||Gastropoda||Snails, slugs & sea butterflies|
|Recorded Distribution in Britain and Ireland||Recorded all around Britain and Ireland.|
|Habitat information||Onchidoris bilamellata can be found in the intertidal and shallow sublittoral, to a depth of 20 m.|
|Description||Onchidoris bilamellata can grow to 4 cm in length and are usually white with a brown pattern on the mantle. However immature specimens and the occasional adult may be completely white in colour. It bears many (usually white) club shaped projections (tubercles) on its mantle and has two ringed sensory tentacles on its head. The numerous (up to 29) retractile gills are speckled brown around the edges and arranged in a horseshoe shape. The head extends to form an oral veil which lacks tentacles. The spawn is in the shape of a flattered coil attached to the substratum by one edge and contains many thousand eggs.|
|Additional information||This species produces acid secretions from the mantle when disturbed. It is gregarious and feeds exclusively on barnacles, especially Semibalanus balanoides.|
This review can be cited as follows:
Rose Edwards 2004. Onchidoris bilamellata. A sea slug. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 19/05/2013]. Available from: <http://www.marlin.ac.uk/speciesinformation.php?speciesID=3958>