Abstract

The trophic tissue of ovarioles of 32 species of polyphage Coleoptera was investigated by light and electron microscopy. Ovaries were compared according to the number of ovarioles, length, width, and volume of the terminal chambers, to the number, diameter, and volume of nurse cell nuclei, as well as to the structure of nurse cell cytoplasm and to the structure of interstitial cells. Mitosis of nurse cells or interstitial cells in fully developed ovarioles was never observed, but there is strong evidence for endomitosis in nurse cells.

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