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Acorn barnacle

Semibalanus balanoides

Photo by The MnMs
Published on Project Noah
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60.7473, -0.909377

Field Notes

Description:

Adult S. balanoides grow up to 15 millimetres (0.6 in) in diameter, and are sessile, living attached to rocks and other solid substrates. When the tide rises to cover the barnacles, the operculum opens, and feathery cirri (modified thoracic appendages) are extended into the water to filter food from the seawater.

Habitat:

Widespread boreo-arctic species. These were seen in beaches of Unst, Shetland I.

Reference Links:

Semibalanus balanoides

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Spotted for Missions

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Arctic Wildlife
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Mollusca
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Biodiversity of Scotland

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Photographed
PublishedJuly 25, 2013

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