Redescriptjon of Pleistophora intestinalis Chatton, 1907, a microsporidian parasite of Daphnia magna and Daphnia puiex, with establishment of the new genus Glugoides (Microspora, glugeidae)
1996; Elsevier BV; Volume: 32; Issue: 2 Linguagem: Inglês
10.1016/s0932-4739(96)80024-1
ISSN1618-0429
AutoresJohan Larsson, Dieter Ebert, Jiří Vávra, Vladimir N. Voronin,
Tópico(s)Chromosomal and Genetic Variations
ResumoThe cytology of a microsporidium identified as Pleistophora intestinalis Chatton, 1907, is described with emphasis on the ultrastructure. The spores are somewhat asymmetrical, ovoid to lightly kidney-shaped, measuring 1.1–1.7 × 2.4–2.7 urn in fresh preparations. The spore wall is three-layered with an approximately 15 nm thick exospore, which is electron-dense with a more dense surface coat. The polar filament is isofilar with 5–8, mostly 6, coils in a single layer, and the polaroplast has two regions with lamellae, the anterior ones more densely packed. All life cycle stages have isolated nuclei and the spores are uninucleate. Merozoites and sporoblasts are produced by plasmotomy, and the sporogony is polysporoblastic. Merogonial stages are enclosed in parasitophorous vacuoles, sporogonial stages in double envelopes: the parasitophorous vacuole and a spor-ophorous vesicle, formed by duplication of the plasma membrane of the sporont. There is some doubt that Pleistophora intestinalis of Daphnia magna and of D. pulex is the same microsporidian species, but that was not proven by the cytological analysis. The identification has been verified by study of material originating from Chatton and of the microsporidium Otto Jírovec, the first reviser, identified as P. intestinalis. The microsporidium is not a Pleistophora species. The new genus Glugoides is established, and placed in the family Glugeidae.
Referência(s)