Diversity and Distribution of the Pedunculate Barnacle Octolasmis in the Seas Adjacent to Singapore

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Abstract
Early in 1981 marine Crustacea (Decapoda) indigenous to Singapore waters were examined for epizoic pedunculate barnacles of the genus Octolasmis (Gray, 1825). Of the 56 decapod species examined, 27 were hosts of up to 7 Octolasmis spp. each. The Octolasmis spp. observed included O. angulata, O. bullata, O. cor, O. lowei, O. neptuni, O. tridens, O. warwickii and 3 unnamed species. Of the 10 Octolasmis spp. one (rarely 2) was found externally on the body and appendages and 9 spp. were found internally in the gill chambers. Host specificity varied, but most Octolasmis spp. occurred on several host species. With 1 exception, significantly more barnacles were found on the inner side than on the outer side of the host gills. Barnacles were unevenly distributed over the proximal, medial and distal portions of the gills. Generally barnacle species had distinctive distribution patterns over the gills. In the crab Scylla serrata densities of 2 Octolasmis spp. were highly correlated; in Charybdis cruciata the correlation between 2 other species of barnacles was less pronounced.

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