Balanus Balanoides -

It uses long, feathery appendages called cirri to filter plankton from the water. Habitat and Ecology

Common threats include whelks (sea snails) and starfish. Life Cycle and Reproduction balanus balanoides

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 uses long, feathery appendages called cirri to

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. It uses long

It thrives in the intertidal zone , where it is regularly submerged and exposed by the tide.

The opening at the top is diamond-shaped and protected by four plates that form a "door" to prevent drying out (desiccation) during low tide.