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Characterization of Fasciola hepatica redial generations by morphometry and chaetotaxy under experimental conditions

Published online by Cambridge University Press:  05 June 2009

D. Augot ,
D. Rondelaud ,
G. Dreyfuss ,
J. Cabaret ,
C. Bayssade-Dufour  and
J.L. Albaret
D. Augot
Affiliation:
Laboratoire d'Histopathologie Parasitaire, Faculté de Médecine Laboratoire de Parasitologie, Faculté de Pharmacie, 2, rue du Docteur Raymond Marcland, 87025 Limoges Cedex, France
D. Rondelaud*
Affiliation:
Laboratoire d'Histopathologie Parasitaire, Faculté de Médecine
G. Dreyfuss
Affiliation:
Laboratoire de Parasitologie, Faculté de Pharmacie, 2, rue du Docteur Raymond Marcland, 87025 Limoges Cedex, France
J. Cabaret
Affiliation:
Station de Pathologie Aviaire et de Parasitologie, Institut National de la Recherche Agronomique, 37380 Nouzilly Cedex, France
C. Bayssade-Dufour
Affiliation:
Laboratoire de Biologie Parasitaire, Muséum National d'Histoire Naturelle, 61, rue Buffon, 75231 Paris Cedex 5, France
J.L. Albaret
Affiliation:
Laboratoire de Biologie Parasitaire, Muséum National d'Histoire Naturelle, 61, rue Buffon, 75231 Paris Cedex 5, France
*
*Author for correspondence. Fax: 33 5 55 43 58 93 E-mail: rondelaud@pharma.unilim.fr
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Abstract

Morphometric and chaetotactic studies were carried out on the body and cephalic regions of the rediae of Fasciola hepatica (Trematoda: Fasciolidae) in order to precisely identify the different redial generations of this trematode in Lymnaea truncatula under experimental infection. At day 49 post-exposure at 20°C, the length of the redia was significantly higher in the first group of the first generation (R1a) compared with successive generations, R1b, R2a and R2b/R3a. The width of the body was similar in the R1a, R1b, and R2a rediae, but was significantly lower in the R2b/R3a groups. The intrapharyngeal cavity of R1a rediae was significantly wider compared with the R1b, R2a, and R2b/R3a groups, whereas the pharyngeal wall was significantly thicker in the R2b/R3a rediae compared with the R1b and R2a groups. Four other measurements, namely the maximum length and width of the pharynx, diameter of the mouth, and width of intestine, also showed significant variations in relation to pharyngeal morphology and age of infection. Discriminant analysis based on these measurements demonstrated that 98% of the rediae were readily categorized into the four groups identified. The number of perioral sensillae ranged from 126 to 160 but a significant difference was only noted between the mean values of the first generation and those of the group R2b/R3a. From these parameters, the maximum width of the pharyngeal lumen was found to be the best characteristic in the identification of the redial generations.

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Type
Research Papers
Information
Journal of Helminthology , Volume 72 , Issue 3 , September 1998 , pp. 193 - 198
Copyright
Copyright © Cambridge University Press 1998

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