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Distribution in scandinavian waters
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Maximum length: 3,8 cm.
Appearance: The thick shell is oblong in shape, but
otherwise has an irregular form. Black external ligament.
The yellow-brown shells that get washed up onto the beaches
are usually worn and attain a white colour.
Depth: 0 - approx. 700 m.
Environment: The Rock-borer lives in cavities like e.g. other
empty shells, amongst calcareous tubes from the polychaetes and between
branches
in the wrack. They can also bore into softer rocks by scraping against
it with their shell and slowly wearing away the rock. Quite often the
shell can attain the same shape as the hole they sit in.
Misc: Rock-borers eat plankton that they filter out of the water.
Two nearly identical specie are known in Swedish waters.
Classification: The Rock-borer is a member of the bivalve group
under the molluscs.
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