Abstract
A new microsporidian species was described from the muscle and connective tissue of the glossophoniid leech Batracobdella picta. Subepithelial xenomas contained sporonts, sporoblasts, and spores. Merogonic stages were not observed. All sporogonic stages were diplokaryotic. Mature spores were ovoid, 3.0–3.6 × 1.8–2.2 μm. The spore wall was 190–240 nm thick, with a distinct exospore, endospore, and underlying plasmalemma. The polar filament had 12–13 coils and measured 105 nm in diameter. The angle of tilt of the anterior coils of the filament to the vertical axis of the spore was about 63°. This newly discovered parasite was named Nosema jirivavrai.
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