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Etude microscopique de L'ovogenese chez la femelle de Callinectes amnicola de Rochebrune, 1883 (Decapoda Portunidae)

Authors
Publisher
Université de Lomé (Togo)
Publication Date
Keywords
  • Crabs
  • Callinectes Amnicola
  • Female
  • Ovogenesis.

Abstract

Histological survey showed that the ovary of Callinectes amnicola was made of two elements, lobes of ovogonia and an amorphous zone. Both of them participate into ovogenesis. According to structural and ultrastructural aspects, process of the ovogenesis comprises five stages in which ovogonia change successively in oocytes and in follicles. Follicles are formed at the level of the amorphous zone following the oocytes migration. During the ovary development, maturation of the oocytes takes place with the occurrence of follicle membrane and a single layer of follicular cells, which disappears before realising of eggs from the general cavity of the animal. During this laying, the fertilized egg is surrounded only by fertilization membrane. It then starts directly its embryonic development. Au plan histologique, l’ébauche de l'ovaire chez Callinectes amnicola comporte des lobes d’ovogonies et une zone sans structure, qui interviennent tous les deux dans l’ovogenèse. Abordé sous les aspectsstructural et ultrastructural, le processus de l’ovogenèse comprend cinq étapes au cours desquelles les ovogonies se transforment successivement en ovocytes et en follicules. Les follicules se forment au niveau de la zone amorphe suite à la migration des ovocytes. Au cours de la maturation ovocytaire qui se déroule durant l'évolution de l'ovaire, se forment la membrane ovocytaire et une seule couche de cellules folliculeuses qui disparaît avant la ponte. L’oeuf pondu est donc entouré uniquement de la membrane de fécondation. Etant un oeuf fécondé, il entame directement son développement embryonnaire.

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