The striped barnacle, Balanus amphitrite, is a medium-sized surface-fouling, sessile barnacle with distinct vertical bands of purple stripes on it's protective rigid housing plates, known as capitulum plates. It is conical in appearance and largest at the base, with a diamond-shaped opening protected by a movable opercular lid composed of two symmetrical triangular halves. Each of these halves contains two plates, the tergum and the scutum. The operculum opens when is the lid halves are flexed out to the sides (Cohen 2005).B. amphitrite is an acorn barnacle (Suborder Balanomorpha). Like all members of the taxon, it resides within a protective wall of rigid plates and is attached by its base directly to solid substrata. In contrast, goose barnacles attach by means of slender, flexible stalks (Cohen 2005).