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Functional Morphology and Ultrastructure of the Anterior Mid-Gut Diverticulae of Larvae of Penaeus Monodon Fabricius, 1798 (Decapoda, Natantia)

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L'histologie et la morphologie fonctionnelle des diverticules de l'intestin moyen antérieur de la crevette Penaeus monodon Fabricius sont décrites au cours du développement larvaire. Le volume des diverticules est double de celui de l'hépatopancréas au stade protozoé I, mais au cours des stades ultérieurs ce dernier organe se développe rapidement, tandis que les premiers régressent. L'histologie, comme l'observation directe, confirme que les diverticules assument une fonction similaire à celle de l'hépatopancréas. Les diverticules constitueraient le principal organe digestif pendant les premiers stades larvaires phytotrophiques; cette fonction passerait ensuite à l'hépatopancréas, qui ne deviendrait pleinement fonctionnel qu'au cours des derniers stades zootrophiques.

Affiliations: 1: Marine Science Laboratories, University College of North Wales, Menai Bridge, Gwynedd, LL59 5EY, U.K.


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