Pathogénie, cycle de développement et ultrastructure d'Amblyospora culicis n. sp. (Protozoa, Microspora), parasite du moustique Culex quinquefasciatus Say, 1823 (Diptera, Culicidae)

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Abstract
Amblyospora culicis n. sp. is a new microsporidian parasite of the mosquito Culex quinquefasciatus Say, 1823 (Diptera, Culicidae). It infects the adipose and nervous tissues of male and female larvae and adults, as well as the ovaries of adult females. The observed meronts have, in turn, one, then two diplokaryons constituted of diploid nuclei. The sporogony is pansporoblastic and octosporous. At first, diplokariotic meronts transform into diplokaryotic presporonts bounded by a wall. Then, the plasma membrane of the presporont detaches itself from the wall, thus creating a pansporoblastic vacuole. A new wall appears around the presporont which thus becomes a sporont. Its two nuclei separate from each other, then the cytoplasm divides to form two uninucleate sporonts. Each then undergoes two meiotic divisions which end in the formation of eight uninucleate and haploid sporonts. These sporonts evolve into sporoblasts, then into spores. The spores are ovoid, uninucleate, and haploid (8.55 ± 0.13 × 6.46 ± 0.08 μm). They are bounded by a wall having a thick multilayered exospore and contain a polar filament abruptly constricted in its coiled part.