Abstract

The surface morphology of a dome-shaped genital chamber in the female Musca domestica L., where the sperm and egg meet following ovulation, was examined to determine its role in fertilization. The inner surface of the chamber was found to be lined with 3 types of nonarticulated cuticular spines. Examination of eggs removed from the chamber indicated that the distinctly robust spines at the apex were involved with the removal of a mucoid secretion which occludes the micropyle opening. The spines lining the rest of the chamber were more slender and flexible than those at the apex, and may function in ensuring that sperm remain at the fertilization site when the egg is placed into the chamber.

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