Variations du système sensoriel de la cercaire de <i>Schistosoma mansoni</i>.

Bayssade-Dufour, Ch.

doi:10.1051/parasite/1979546593

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…presenting more caudal receptors than the other taxa. These results support the idea that sensory receptors tend to accumulate in regions that are actively involved in host recognition and penetration (Richard 1971, Bayssade-Dufour 1979, Haas and Haberl 1997. These regions may vary according to the type of cercaria and its transmission mode.…”

Section: Functional Componentssupporting

confidence: 78%

“…2). These maps also confirm the diagnostic characters previously established for the families Allocreadiidae, Lecithodendriidae and Opecoelidae (Richard 1971, Bayssade-Dufour 1979, Bayssade-Dufour et al 1993.…”

Section: Phylogenetic Componentssupporting

confidence: 74%

“…Besides, it is clear that the distribution of receptors on the cercarial tegument is phylogenetically based, with chaetotaxic patterns recognised at the family, genus and species levels (Richard 1971, Bayssade-Dufour 1979, Bayssade-Dufour et al 1993. What remains unclear, however, is whether receptor types and/or distribution patterns of receptor types may be taxon-specific.…”

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confidence: 99%

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Functional and phylogenetic components in cercarial nervous systems

Bogéa¹

2004

FOLIA PARASIT

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Abstract. Studies involving comparisons of taxa that vary in their degree of relatedness may allow the distinction of functional and phylogenetic components in cercarial sensory systems. In this study, cercariae of allocreadiids Bunodera Railliet, 1896 and Crepidostomum Braun, 1900, lecithodendriid Allassogonoporus Olivier, 1938 and opecoelid Allopodocotyle Pritchard, 1966 were compared as regards ultrastructure and chaetotaxy of sensory receptors as well as neuromorphology. Cercariae were treated with acetylthiocholine iodide and silver nitrate and some were processed for scanning and transmission electron microscopy. The types of cercarial sensory receptors differed in the presence of a tegumentary sheath, a dome-like base and a tegumentary collar, number of cilia (0, 1, 2 or more), cilium length (short, moderately long or long) and tegumentary collar length (low to moderately low, high or very high). Chaetotaxic patterns were consistent at the family level in all taxa studied. Irregular cholinergic nerve networks were identified. The present study indicates that the major categories of cercarial sensory receptors are nonciliated (including sheathed and subtegumentary types) and ciliated (including uncollared and collared types) receptors. It also allows the distinction of functional and phylogenetic components in the sensory systems of the cercariae studied. Functional components were reflected in the numbers of sensory receptors associated with each nerve region and in the ultrastructure and site-specificity of receptor types. Phylogenetic components included taxon-specific chaetotaxic patterns and receptor types.In the past, the investigation of cercarial sensory systems had emphasised the morphology and distribution of receptor types. Ultrastructural studies have revealed the existence of several types of receptors across the larval tegument of Digenea (Halton et al. 1997). These types suggest that different forms are associated with distinct functions. Site-specificity of receptor types also supports this idea in several species (Bogéa and Caira 2001a, b, c). Functional components are more strongly implicated when similar site-specific patterns are found among distant related taxa, particularly in those that share life-cycle strategies.Sensory receptor types found to be restricted to groups of related species, on the other hand, would suggest that there might be at least some phylogenetic components to these features. Besides, it is clear that the distribution of receptors on the cercarial tegument is phylogenetically based, with chaetotaxic patterns recognised at the family, genus and species levels (Richard 1971, Bayssade-Dufour 1979, Bayssade-Dufour et al. 1993. What remains unclear, however, is whether receptor types and/or distribution patterns of receptor types may be taxon-specific.Studies involving comparisons among taxa that vary in their degree of relatedness, therefore, emerge as a strategy that may allow distinction between functional and phylogenetic components in cercarial sensory systems....

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Section: Functional Componentssupporting

confidence: 78%

Section: Phylogenetic Componentssupporting

confidence: 74%

mentioning

confidence: 99%

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Functional and phylogenetic components in cercarial nervous systems

Bogéa¹

2004

FOLIA PARASIT

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“…African strains present lateral papillae in a triangular shape and a cercarial index of 1.0. They are thus different from American strains where the disposition is linear and the index is greater (1.0-1.4) (Bayssade-Dufour 1979b). Between two strains (JR e C5) from Venezuela, it has been demonstrated that the former demonstrated a higher variation coefficient in the total number of papillae (dorsal and ventral) and more than one anterior ventral papilla (Pino et al 1997).…”

mentioning

confidence: 99%

Cercarial Chaetotaxy and Sex Differentiation of Schistosoma mansoni Deriving from Humans and Nectomys squamipes (Muridae: Sigmondontinae) in Brazil

Freire

Machado-Silva

Rodrigues-Silva³

et al. 2002

Mem. Inst. Oswaldo Cruz

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“…Moreover, S. mansoni strains can be identified by the chetotaxic study of the sensorial argentophilic papillae of cercariae (Bayssade-Dufour 1977, 1979, Cassone et al 1979, Pino et al 1988, 1997. Nevertheless, there are few reports on the morphometric analysis of non-sensorial structures in the cercariae aiming at taxonomic approaches (Zanotti-Magalhães et al 1993).…”

Section: Differences In Brazilian Strains Of Schistosoma Mansonimentioning

confidence: 99%