Barnacle

BARNACLE belongs to the group of marine invertebrates known as crustaceans. The young animal swims freely near the water surface, growing rapidly until it develops a shell and adheres permanently to a hard surface or, with some species, to a larger animal. Barnacles generally occur in large quantities bunched together. There are 2 common species. Acorn barnacles (Balanus glandula) are small, white, volcano-shaped creatures. Their hard outer shell consists of a set of rigid plates and 2 pairs of...

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