Abstract

The developmental stages of a microsporidium from larvae of Pristiphora erichsonii were investigated. Meronts appeared to be the only stage containing a diplokaryon. Nuclei of sporonts in a parasitophorous vesicle underwent at least three divisions and uninucleate sporoblasts developed from these multinucleate sporonts. As many as 38 spores were observed with a vesicle. A thin pansporoblastic membrane limited the vesicle and was derived from rough endoplasmic reticulum of the host cell. The microsporidium was tentatively identified as Pleistophora sp. Infection levels of the microsporidium in natural populations of P. erichsonii reached 25%.

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