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Description of CystosporogenesThe type species is C. operophterae (Canning, 1960) Canning, Barker, Nicholas and Page, 1985 in silk glands, gut and other tissues of Operophtera brumata (Lepidoptera, Geometridae). The species was transferred to the new genus by Canning, Barker, Nicholas and Page (1985,a). Monomorphic, monokaryotic throughout life cycle. Meiosis unknown. Transmission is transovarial and per os. Merogony: small plasmodia with several isolated nuclei surrounded by a single close-fitting membrane, possibly of host origin. The membrane divides with the meronts. Sporogony: multinucleate plasmodia, divide within the encasing membrane. The membrane is persistent around the sporoblasts and spores, which may number up to sixty. Spores, 2.5 x 1.2 µm, elongate-ellipsoid and uninucleate, with a corrugated exospore and moderately thick endospore. The polaroplast was not described. Polar tube is isofilar, with 10 - 11 coils in a single rank. Comment: the origin of the membrane surrounding the meronts and persisting around spores was not determined. The genus resembles Endoreticulatus except that Endoreticulatus has a double layer of endoplasmic reticulum surrounding all stages. Cells of the silk glands are infected in a regular pattern and are not hypertrophied, in contrast to the effect of Orthosomella on the same host.