Adults generally reach up to 15 mm in diameter , though some records suggest they can range up to 7.5 cm in certain conditions.
It thrives in the intertidal zone , where it is regularly submerged and exposed by the tide.
Common threats include whelks (sea snails) and starfish. Life Cycle and Reproduction
It typically has six calcified grey-white shell plates . A key distinguishing feature is its membranous base , unlike many other barnacles that have calcified bases.