• Norwegian: rankeføttinger


Some barnacles are parasitic, in contrast to the free-living species. The parasites have a unsegmented body with no carapace or legs. Common to the free-living barnacles are that they are sessile, i.e. they are attached to some surface by their first pair of antennas. They actually sit on their heads. They are protected by a shell or carapace, with an opening where they stretch out for food.


All barnacles are marine species. Most familiar species, so typical of rocky locations, are members of the superorder Thoracica.