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Some Observations on the Epizoic Barnacle Octolasmis Angulata within the Branchial Chambers of an Australian Swimming Crab

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Abstract An epizoic stalked barnacle, Octolasmis angulata, was identified within the branchial chambers of Charybdis callianassa, a swimming crab from Moreton Bay, Queensland, Australia, making this crab a new host for O. angulata. In the present study fifty-two crabs, 30–49 mm carapace width, were dissected, and thirty-three were found to have the epizoite. The number and position of the O. angulata within the branchial chambers were noted. Octolasmis angulata is principally found attached to the cuticle of the anterior chamber wall in the epibranchial space, although attachment to the gills does occur. Charybdis callianassa is also parasitized by the sacculinid barnacle Heterosaccus lunatus, and one such parasitized crab contained eighty-seven O. angulata, the highest number recorded in the present study. The factors governing O. angulata distribution within the branchial chambers of C. callianassa are discussed.

Affiliations: 1: School of Ocean Sciences, University of Wales, Bangor, Menai Bridge, Anglesey LL59 5EY, U.K.; study carried out at the Department of Microbiology and Parasitology, University of Queensland, Brisbane, Australia 4072 (


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