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Sur Deux Bopyriens Parasites De Pagures Recueillis Par M. a. Horridge Dans La Mer Rouge Et Sur Leur Asymétrie

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We have studied two bopyrid parasites of pagurids collected by Mr. A. Horridge from the foreshore near the Marine Biological Station at Al Ghardaqa, Red Sea, Egypt. The first one, Asymmetrione asymmetrica (Shiino, 1933) shiinoi n.ssp., is a gill parasite of Clibanarius signatus Heller. We believe it to be a new subspecies of Pseudione asymmetrica Shiino, 1933 of Japan, for which we established a new genus, Asymmetrione n.g., in view of its exceptional asymmetry and other decidedly distinct characters. The second one, Athelges aegyptius n. sp., is an abdominal parasite of Diogenes senex Heller (cf. Nobili, 1906) and more closely allied to A. caudalis Barnard, 1955 of Mozambique, East Africa. These two most significant examples bring us to the conclusion that asymmetry in the females of bopyrids is due to unequal growth genotypically induced, irrespective of its site on the host. The latter may influence only the direction of the asymmetry in those cases when either side of the host-body may be infested. Ovarian hypertrophy may account for this hereditary asymmetry favoured by the parasitic life and thus belonging to the problem of phenocopy.

Affiliations: 1: Laboratoire de Zoologie, Invertébrés, Faculté de Biologie, Bucarest, Roumanie; 2: Fisheries Laboratory, Wellington, Nouvelle Zélande


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