Issue |
Ann. Parasitol. Hum. Comp.
Volume 66, Number 4, 1991
|
|
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Page(s) | 139 - 143 | |
DOI | https://doi.org/10.1051/parasite/1991664139 | |
Published online | 17 August 2016 |
Mémoire
Electron microscopic studies of Caryospora colubris development in the Syrian black snake Coluber jugularis
Étude ultrastructurale du développement de Caryospora colubris chez Coluber jugularis
Department of Animal Sciences, Faculty of Agriculture of the Hebrew University of Jerusalem, Rehovot 76-100, Israel.
Accepted: 2 July 1991
Endogenous stages of Caryospora colubris Matuscha 1984 in the intestine of Coluber jugularis from Israel were studied by transmission electron microscopy. It is the first ultrastructural description of endogenous stages of Caryospora. The following stages are described : trophozoites, meronts microgamonts, macrogamonts and wall forming oocysts. The fine structure of the endogenous stages generally conforms with that of higher vertebrate Eimeria and Isospora. In the merozoites, however, the pellicle only lines the anterior tip, while the whole is bound by a single membrane with only fragments of an inner membrane. The wall formed around the oocyst, presumably the outer wall, is thick and contains a granular matrix. This stage of wall formation has been, thus far, not seen in other studied reptilian coccidia. Wall formation coincided with the disaggregation of type 1 wall forming bodies, while type 2 wall forming bodies remain unchanged.
Résumé
La première étude ultrastructurale des stades endogènes du genre Caryospora est effectuée sur Caryospora colubris Matuscha, 1984, parasite de l’intestin de Coluber jugularis en Israël. Description des trophozoites, des mérontes, des microgamontes, des macrogamontes et de la formation des parois des oocystes. L’ultrastructure des mérozoïtes est conforme à celle des Eimeria et Isospora des vertébrés supérieurs, mais la pellicule limitante intéresse seulement l’extrémité antérieure, et l’ensemble de la cellule est entourée d’une membrane simple avec seulement des fragments de membrane interne. La paroi formée autour de l’oocyste, vraisemblablement la paroi externe, est épaisse et contient une matrice granuleuse. La formation de la paroi, qui n’avait pas encore été observée chez le coccidies de reptiles, s’effectue à partir de la désagrégation des initiales de type 1 (Wall Forming Bodies WF1), alors que les initiales de type 2 (WF2) restent inchangées.
Key words: Caryospora colubris / Ultrastructure / Oocyst wall formation
Mots clés : Caryospora colubris / Ultrastructures / Formation des parois des oocystes
© Masson, Paris 1991, transferred to Société Française de Parasitologie
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