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The Occurrence and Distribution of Stalked Barnacles of the Genus Octolasmis on the Gills of Mud or Mangrove Crab, Genus Scylla

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[Several specimens of the mud crab, Scylla cf. tranquebarica (Fabricius, 1798), were examined for the presence of stalked barnacles on the gills. Eighty-five percent of the crabs, for the size group 50 to 108 mm carapace width, were found infested with stalked barnacles. In all crabs, the barnacles were found attached to the inner (hypobranchial) surface of the gill with the exception of a single crab in which the barnacles were also found attached to the outer (epibranchial) surface of the gill. The stalked barnacles were identified as Octolasmis cor (Aurivillius, 1892) and O. angulata (Aurivillius, 1894), and our size-frequency data support the view that they are indeed distinct species. Their distribution on various parts of the gills, i.e., proximal, medial, or distal, was noted. Most of the barnacles were found attached to the medial part of the gill (O. cor 55%; O. angulata 57%), followed by the proximal part (O. cor 31%; O. angulata 38%), and the distal part (O. cor 14%; O. angulata 5%). Gill number 7 bore the maximum number of O. cor (33%) found, whereas gill number 4 harboured the maximum number of O. angulata (30.2%). Divers spécimens du crabe Scylla cf. tranquebarica (Fabricius, 1798), ont été examinés pour rechercher la présence de bernacles pédonculés sur les branchies. Un total de 85% des crabes, pour le groupe de taille de 50 à 108 mm de largeur de carapace, ont été trouvés infestés par des bernacles pédonculés. Dans tous les crabes, les bernacles ont été trouvés accrochés à la face interne de la branchie (hypobranchie) à l'exception d'un seul crabe chez lequel les bernacles ont été trouvés sur la surface externe (épibranchie) de la branchie. Les bernacles ont été identifiés comme Octolasmis cor (Aurivillius, 1892) et O. angulata (Aurivillius, 1894) et nos observations sur la distribution des tailles soutiennent l'hypothèse qu'elles sont vraiment des espèces séparées. Leur distribution sur les différentes parties des branchies, i. e., proximal, médian ou distal ont été notées. La plus part des bernacles ont été trouvés accrochés dans la partie médiane de la branchie (O. cor 55%; O. angulata 57%), suivie par la partie proximale (O. cor 31%; O. angulata 38%), et la partie distale (O. cor 14%; O. angulata 5%). La branchie 7 porte le nombre maximum de O. cor (33%) trouvés, alors que la branchie 4 accueille un maximum de O. angulata (30.2%)., Several specimens of the mud crab, Scylla cf. tranquebarica (Fabricius, 1798), were examined for the presence of stalked barnacles on the gills. Eighty-five percent of the crabs, for the size group 50 to 108 mm carapace width, were found infested with stalked barnacles. In all crabs, the barnacles were found attached to the inner (hypobranchial) surface of the gill with the exception of a single crab in which the barnacles were also found attached to the outer (epibranchial) surface of the gill. The stalked barnacles were identified as Octolasmis cor (Aurivillius, 1892) and O. angulata (Aurivillius, 1894), and our size-frequency data support the view that they are indeed distinct species. Their distribution on various parts of the gills, i.e., proximal, medial, or distal, was noted. Most of the barnacles were found attached to the medial part of the gill (O. cor 55%; O. angulata 57%), followed by the proximal part (O. cor 31%; O. angulata 38%), and the distal part (O. cor 14%; O. angulata 5%). Gill number 7 bore the maximum number of O. cor (33%) found, whereas gill number 4 harboured the maximum number of O. angulata (30.2%). Divers spécimens du crabe Scylla cf. tranquebarica (Fabricius, 1798), ont été examinés pour rechercher la présence de bernacles pédonculés sur les branchies. Un total de 85% des crabes, pour le groupe de taille de 50 à 108 mm de largeur de carapace, ont été trouvés infestés par des bernacles pédonculés. Dans tous les crabes, les bernacles ont été trouvés accrochés à la face interne de la branchie (hypobranchie) à l'exception d'un seul crabe chez lequel les bernacles ont été trouvés sur la surface externe (épibranchie) de la branchie. Les bernacles ont été identifiés comme Octolasmis cor (Aurivillius, 1892) et O. angulata (Aurivillius, 1894) et nos observations sur la distribution des tailles soutiennent l'hypothèse qu'elles sont vraiment des espèces séparées. Leur distribution sur les différentes parties des branchies, i. e., proximal, médian ou distal ont été notées. La plus part des bernacles ont été trouvés accrochés dans la partie médiane de la branchie (O. cor 55%; O. angulata 57%), suivie par la partie proximale (O. cor 31%; O. angulata 38%), et la partie distale (O. cor 14%; O. angulata 5%). La branchie 7 porte le nombre maximum de O. cor (33%) trouvés, alors que la branchie 4 accueille un maximum de O. angulata (30.2%).]

Affiliations: 1: Centre of Excellence in Marine Biology, University of Karachi, Karachi-75270, Pakistan; 2: Centre of Excellence in Marine Biology, University of Karachi, Karachi-75270, Pakistan; or: , jmst@cyber.net.pk, Email: jmst@cyber.net.pk

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/content/journals/10.1163/156854008x363696
2009-01-01
2016-12-10

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