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Origin of germinal cells and the reproductive cycle of the asteroid Asterias rubens L.(Echinodermata)

par Bouland, Catherine ;Jangoux, Michel
Référence Invertebrate Reproduction and Development, 17, 2, page (97-102)
Publication Publié, 1990

Article révisé par les pairs

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Résumé :

A genital bud was observed in the aboral hemal system of Asterias rubens. Its structure is very similar to the parietal structure of a gonad. Three cell types are recognized, two of them (primordial germinal cells and ciliated somadc cells) border the periphery of the genital bud, the third type (pseudopodial cells) is found in the lumen. They form a cylindric structure surrounded by a thick and continuous basal lamina. The genital bud has a cyclical appearance and development within the aboral hemal system. Its major development coincides with the regression of the gonads that occurs after the natural spawning of gametes. The possible involvement of the genital bud in the initiation of the following year’s gametogenesis is considered. The complete regression of the gonad after spawning suggests an annual neoformation of the gonad preceding the initiation of the gametogenetic cycle. © 1990 Balaban.