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image of Crustaceana

A survey of the development of Synisoma nadejda allowed to etablish that at birth the juveniles of this species measure about 3 mm in length. They undergo successive moults, to eventually acquire their pereiopods VII and external sexual characters. Setation, the number of aesthetascs, and the number of segments of the antennal flagellum increase in the course of the moulting sequence. Sexual differentiation of S. nadejda is characterized by the appearance of the genital apophyses, the copulatory stylets in the male, and the genital openings and incubation pouch in the female. Males are precocious as compared to females of the same age, who tend to differentiate later.

L'étude du développement de Synisoma nadejda nous a permis de constater qu'à la naissance les jeunes de S. nadejda mesurent en moyenne 3 mm. Ils subissent des mues successives qui leur permettent d'acquérir les péréiopodes VII et les caractères sexuels externes. La sétation, le nombre d'aesthètes ainsi que le nombre d'articles du fouet antennaire augmentent au cours des mues. La différenciation sexuelle des S. nadejda se caractérise par l'apparition des apophyses génitales, des stylets copulateurs chez le mâle et des orifices génitaux et de la poche incubatrice chez la femelle. Les mâles sont précoces par rapport aux femelles de même âge, qui se différencient ultérieurement.


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