Balanus nubilus, commonly called the giant acorn barnacle, is the world's largest barnacle, reaching a diameter of 15 centimetres (5.9 in) and a height of up to 30 centimetres (12 in), and containing the largest known muscle fibres.B. nubilus is frequently found growing on rocks, pier pilings and hard-shelled animals at depths of up to 90 metres (300 ft) from Alaska to La Jolla, San Diego County, California. Like other acorn barnacles, B.
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