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Redial generations of Fasciola gigantica in the pulmonate snail Lymnaea truncatula

Published online by Cambridge University Press:  05 June 2009

Rakotondravao ,
A. Moukrim ,
P. Hourdin  and
D. Rondelaud
Rakotondravao
Affiliation:
Département de Recherches Zootechniques et Vétérinaires, Division de Parasitologie, B. P. 4, Tananarive, Madagascar
A. Moukrim
Affiliation:
Faculté des Sciences, Département de Biologie, Unité de Parasitologie, Université Ibnou Zohr, B. P. 28/S, Agadir, Morocco
P. Hourdin
Affiliation:
Faculté de Médecine, Laboratoire d'Histologie, Unité d'Histopathologie Parasitaire, 2, Rue du Docteur Raymond Marcland, 87025 Limoges cédex, France
D. Rondelaud*
Affiliation:
Faculté de Médecine, Laboratoire d'Histologie, Unité d'Histopathologie Parasitaire, 2, Rue du Docteur Raymond Marcland, 87025 Limoges cédex, France
*
†Author to whom correspondence should be addressed.
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Abstract

Lymnaea truncatula, 4 mm in height, were subjected to infection by a single miracidium of Fasciola gigantica, then raised at 23°C until day 60 of the experiment. Histological study of these snails demonstrated a mean redial burden of 34 parasites at day 60, of which one third were degenerating forms. The mean number of living independent rediae did not exceed 5 for the first and second generations. Conversely, in subsequent generations there were as many as 18 rediae per snail at day 60. The first living redia of the first generation in particular gave rise to daughter rediae. Mature rediae appeared at day 35 and especially concerned the first and second generations at day 60. The authors conclude that development of the first and second redial generations occurs during the same period, and that the forms of the first cohort of the second generation are produced from the first redia of the first generation which originated from the sporocyst.

Keywords

Lymnaea truncatulaFasciola giganticaredial generationsdevelopmentTrematoda
Type
Research Article
Information
Journal of Helminthology , Volume 66 , Issue 3 , September 1992 , pp. 159 - 166
Copyright
Copyright © Cambridge University Press 1992

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