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Barnacles use the antennae as an attachment organ and there
are six pairs of thoracic legs. The body is surrounded by pairs of fixed calcareous plates and is protected by another pair of plates which close the opening. Barnacles are divided into two groups: the acorn barnacles (Balanomorpha) in which the plates attach directly to the rock, and goose barnacles (Lepadomorpha) which are attached on the end of a stalk. |
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