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Ultrastructural studies on oogenesis in Symphyla

Previtellogenic and vitellogenic stages

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Summary

The paired ovaries of Symphyla are sac-shaped. Their interior is filled with synchronously developing oocytes surrounded by a simple follicular epithelium. Previtellogenic oocytes have spherical or oval nuclei, the latter containing a large number of small nucleoli. Part of the nuclear surface is covered by a thick “coat” made up of a granular substance of medium electron density. The “coat” is penetrated by cisternae of the smooth endoplasmic reticulum. Micropinocytosis is the principal source of yolk in Symphyla; a small amount of yolk material arises within the mitochondrial cristae. Vitellogenic oocytes are characterized by a highly active rough endoplasmic reticulum synthesizing a material, probably lipoprotein in nature, which is incorporated into lipid droplets.

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Supported by Government Problem Grant II-1.3.13. The author is grateful to Dr. F. Kaczmarski of the Medical Academy, Kraków, for the use of EM facilities in his laboratory and to Dr. W. Hüther, Ruhr-Universität, Bochum, for the identification of the specimens

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Biliński, S. Ultrastructural studies on oogenesis in Symphyla. Cell Tissue Res. 202, 145–153 (1979). https://doi.org/10.1007/BF00239227

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