Brown Barnacle

Chamaesipho brunnea is an intertidal barnacle common in New Zealand, on North Island and South Island north of Stewart Island. Juveniles have six shell wall plates, reducing to four in adults, and with age, all plates become concrescent, with no trace of sutures inside or out. Shell is brown colored. The related, and sometimes associated Chamaesipho columna is much smaller in size, by nearly half, while Elminius, which can associate with both species, also has four...