Ultrastructure and development of Pleistophora senegalensis sp. nov. (Protozoa, Microspora) from the gilt‐head sea bream, Sparus aurata L. (Teleost, Sparidae) from the coast of Senegal

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Abstract
The microsporidian Pleistophora senegalensis sp. nov. parasitizes the gilt‐head sea bream, Sparus aurata L, The parasite is found in the intestinal wall where it forms small xenomas in the muscularis. The development cycle of this species is described by light and electron microscopy. Meronts are rounded plasmodia dividing by plasmotomy and bounded by an amorphous and very regular wall. At the onset of sporogony, sporophorous vesicles are formed by separation of the plasma membrane from the external wall which then becomes a characteristic mesh. Mature spores (4.45 × 2.37μm) are ovoid and slightly pyriform with a large posterior vacuole.

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