Abstract
Plistophora anguillarum is a microsporidian parasite inhabiting the muscular tissues of the eel, Anguilla japonica. The spores of the parasite for electron microscope study were collected from the diseased eels obtained at the Hamanako Branch of the Shizuoka Pref. Fish. Exptl. St. The polar filament in the spore attaches its basal part to the polar cap at the anterior end of the spore, and runs through the polaroplast, then coils spirally at the middle to the posterior portion to make 44 coils. The tubular polar filament has 5 layers. Many radial ridges are seen in the transverse section of the filament. It seems that the ridges coil spirally along the inner surface of the outer layer of the filament, as observed from the figures of the oblique section. As generally observed the polaroplast appeared laminated. Sporoplasm was not distinguished clearly. Spore shell consists of the outer electron dense laver (0.01-0.02μ thick) and the inner electron transparent layer (0.12-0.26μ thick). The surface of the spore has scarcely any special structure as seen by the scanning electron microscopy. Though 1 or 2 big hollows were seen in the surface of spores these may probably be artifacts. The spore does not change its external shape by the extrusion of the polar filament.
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