Egg-Chamber Development in the Ovarioles of The Fleshfly, Sarcophaga Tibialis Macquart (Diptera: Sarcophagidae), During The First Reproductive Cycle
A polytrophic ovariole of the fleshfly, Sarcophaga tibialis Macquart, is composed of two successively maturing egg chambers, each consisting of an oocyte, an interconnected cluster of 15 nurse cells, and an enveloping layer of follicle cells. The oocyte is established at the posterior end of the egg chamber. Nurse cell differentiation is characterized by nucleolar multiplication. At 25°C the first egg generation took approximately 8 days to develop. During this period, the growth rate of the egg chamber increased with time. A dramatic increase occurred during days 4–6, and was associated with the formation of large intercellular spaces between the follicle cells as well as an accumulation of numerous yolk globules. Completion of egg-chamber development was marked by the degeneration of the cluster of nurse cells and that of follicle cells.
Key WordsOvaries egg chamber differentiation development fleshfly Sarcophaga tibialis oocyte nurse cells follicle cells yolk
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