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Sequence de Reconversion des Sporocystes deSchistosoma mansoni Producteurs de Cercaires, en vue de la Production de Nouvelles Generations de Sporocystes

Sequence of reconversion of the sporocysts ofSchistosoma mansoni producing cercariae, to the production of new generations of sporocysts

Summary

During the life cycle ofSchistosoma mansoni the production of sporocysts of a higher order than secondary is a normal mode of larval multiplication which intervenes in asexual reproduction of the parasite.

The sequence of reconversion of sporocysts producing cercariae to those producing sporocysts III, IV, etc... can be divided into three principal steps: (1) cessation of cercariae production; (2) degeneration of cercariae contained in the sporocyst, and (3) production of the new generation of sporocysts.

Degeneration of intrasporocystic larval material seems to be an indispensable step for the new orientation of production. The significance of this method of multiplication in the ecology of transmission is discussed.

Résumé

Au cours du cycle évolutif deSchistosoma mansoni la production de sporocystes d'ordre supérieur à II est un mode habituel de multiplication larvaire intervenant dans la reproduction asexuée du parasite.

La séquence de reconversion des sporocystes producteurs de cercaires en sporocystes producteurs de sporocystes III, IV, etc... peut être décomposée en trois étapes principales: (1) arrêt de la production cercarienne; (2) dégénérescence des cercaires contenues dans les sporocystes; (3) production de la nouvelle génération de sporocystes.

La dégénérescence du matériel larvaire intrasporocystique serait une étape indispensable à l'orientation nouvelle de la production. L'intérêt d'un tel mode de multiplication dans l'écologie de la transmission est discuté.

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Bibliographie

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Théron, A., Jourdane, J. Sequence de Reconversion des Sporocystes deSchistosoma mansoni Producteurs de Cercaires, en vue de la Production de Nouvelles Generations de Sporocystes. Z. Parasitenkd. 61, 63–71 (1979). https://doi.org/10.1007/BF00927087

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