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Barnacles
http://www.geocities.com/barnacles_br
A list of barnacles species at Guanabara Bay, Rio de Janeiro/RJ, Brazil.
Introduction to the Cirripedia
http://www.ucmp.berkeley.edu/arthropoda/crustacea/maxillopoda/cirripedia.html
Life history, systematics, morphology, and fossil record of the barnacles and their relatives.