Balanus Balanoides -

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

Balanus balanoides , now more commonly known by its accepted scientific name , is a widespread species of sessile acorn barnacle. It is a dominant member of the rocky intertidal zones in the North Atlantic and North Pacific. Physical Characteristics 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 thrives in the intertidal zone , where

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. Physical Characteristics Adults generally reach up to 15

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

It is famous in ecological studies for its competition with the barnacle Chthamalus stellatus . While Balanus can outgrow and smother Chthamalus in lower, wetter areas, it cannot survive as high up the shore as Chthamalus due to a lower tolerance for drying out.