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ORGANES GENITAUX, COPULATION ET FECONDATION CHEZ SYNISOMA MEDITERRANEA REZIG, 1989 (ISOPODA, VALVIFERA)

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This study of the reproduction in Synisoma mediterranea shows that the species is gonochoristic and shows a sexual dimorphism. Both males and females have a dorsal genital system. The genital system consists of two symmetrical parts formed by the gonads, the genital ducts, and the endocrine formations. The copulation takes place after a pre-copulation period. The eggs are fertilized in the ovary; they develop in the marsupium. Incubation lasts 1 month, after which the young leave the brood pouch. Reproduction continues throughout the year, but the maximum of ovigerous females was observed in September, when the water temperature is around 25 C and salinity fluctuates between 36 and 371/2.

L'etude de la reproduction chez Synisoma mediterranea a montre que cette espece est gonochorique, et possede un dimorphisme sexuel bien net. Chez le male et la femelle l'appareil genital est dorsal. Il est forme par deux parties symetriques qui se compose chacune d'une gonade, de conduits genitaux et de formations endocrines. La copulation s'effectue apres une phase precopulatoire. La fecondation des ovules se fait a l'interieur des ovaires. Les uufs se d eveloppent a l'interieur du marsupium. L'incubation dure 1 mois au bout duquel les jeunes quittent la poche incubatrice. La reproduction est continue tout le long de l'annee, cependant un maximum de femelles ovigeres a ete constate pendant le mois de septembre ou la temperature de l'eau est aux alentours de 25 C tandis que la salinite fluctue entre 36 et 371/2.

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