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New morphological information on the parasitic copepods Caligus epinepheli Yamaguti, 1936 and Caligus rotundigenitalis Yu, 1933 (Copepoda, Caligidae) from South Africa

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Caligus epinepheli were collected from De Hoop Nature Reserve along the south coast and from Lake St Lucia along the east coast of South Africa. Caligus rotundigenitalis were collected from Lake St Lucia. Two females, one male, and one chalimus of C. epinepheli were removed from the gill chambers of Diplodus sargus capensis and Rhabdosargus holubi. Only two females of C. rotundigenitalis were removed from inside the operculum of Rhabdosargus holubi. Both species represent new host and distribution records for South Africa. The morphological features of these two species were studied with the aid of scanning electron microscopy. Numerous small setae were observed on the marginal membrane as well as on the dorsal shield of C. epinepheli, probably with a sensory function. Another interesting feature is the long seta near the base of the maxillule, bearing spinules on both margins. All other known Caligus species studied so far have a smooth, long basal seta of the maxillule. In C. rotundigenitalis, the first four spines on the second segment of the exopod of leg 4 are covered with spinules. Caligus epinepheli a été collecté dans la réserve naturelle De Hoop le long de la côte sud et dans le lac St Lucia le long de la côte est d'Afrique du Sud. Caligus rotundigenitalis a été trouvé dans le lac St Lucia. Deux femelles, un mâle et un chalimus de C. epinepheli ont été prélevés dans les chambres branchiales de Diplodus sargus capensis et de Rhabdosargus holubi. Seules, deux femelles de C. rotundigenitalis ont été collectées à l'intérieur de l'opercule de Rhabdosargus holubi. Les deux espèces représentent de nouveaux signalements d'hôte et de répartition pour l'Afrique du Sud. Les caractéristiques morphologiques de ces deux espèces ont été étudiées en microscopie électronique à balayage. De nombreuses petites soies ont été observées sur la membrane marginale et sur le "bouclier" dorsal de C. epinepheli, ayant probablement une fonction sensorielle. Un autre trait intéressant est la longue soie basale de la maxillule portant des spinules sur les deux bords. Toutes les autres espèces connues de Caligus étudiées jusqu'à présent ont une longue soie basale lisse à la maxillule. Chez C. rotundigenitalis, les quatre premières épines du second segment de l'exopodite de la quatrième patte sont recouvertes de spinules.


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