Characterization of Fasciola hepatica redial generations by morphometry and chaetotaxy under experimental conditions
| Autor: | Gilles Dreyfuss, Ch. Bayssade-Dufour, Daniel Rondelaud, D. Augot, J.L. Albaret, Jacques Cabaret |
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| Přispěvatelé: | ProdInra, Migration, Station de Pathologie aviaire et parasitologie [Nouzilly] (PAP), Institut National de la Recherche Agronomique (INRA) |
| Jazyk: | angličtina |
| Rok vydání: | 1998 |
| Předmět: |
Time Factors
[SDV]Life Sciences [q-bio] 030231 tropical medicine Lumen (anatomy) Pulmonata Fasciolidae 030308 mycology & parasitology Lymnaeidae 03 medical and health sciences 0302 clinical medicine medicine Animals Fasciola hepatica ComputingMilieux_MISCELLANEOUS Lymnaea Mouth 0303 health sciences MESURATION CORPORELLE biology Chaetotaxy Pharynx General Medicine Anatomy biology.organism_classification Intestines [SDV] Life Sciences [q-bio] medicine.anatomical_structure Larva REDIE Animal Science and Zoology Parasitology Trematoda |
| Zdroj: | Journal of Helminthology Journal of Helminthology, Cambridge University Press (CUP), 1998, 72, pp.193-198 Scopus-Elsevier |
| ISSN: | 0022-149X 1475-2697 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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