Distribution in scandinavian waters
Maximum diameter: 2,5 cm.
Appearance: Calcareous white-grey shell. The base plate is a
thin membrane that does not leave a white scar on the substrate when
removed. Barancles usually have a rather flat form, but this species,
like a few others, grow
upwards. Compare with the bay
barnacle and the rock
Depth: The Northern rock barnacle can be found from the mean
water line to, on rare occasions, a depth of 45 m.
Environment: This species is found attached to e.g. rocks,
cliffs, , wood or shells. Along the Swedish west coast, they often
build belts along the waterline.
Classification: The Northern rock barnacle belongs to the cirripedia
group, which is a crustacean under the arthropods.