Abstract
The cytological changes and growth rate of nurse cell nuclei, the oocyte nucleus, and the egg chamber during 14 stages of egg development in E. sorbillans Wiedemann are described. Stages 1–3 are mitotically active, resulting in the formation of one oocyte and 15 nurse cells. The visible nonbanded polytene chromosomes are formed at stage 3 in 32n nuclei of smaller nurse cells and 64n nuclei of larger nurse cells. The larger nurse cell nuclei attain a maximal ploidy of 1024n at stage 10. Soon after disintegration of the polytene chromosomes, the nurse cells at stage 6 synthesize the nuclear proteins and transfer them to the developing oocyte, which grows rapidly from stages 11 to 13. At stages 13 and 14, the nurse cells disintegrate and the oocyte matures with chorion, aeropyles, operculum, micropyle, and hatching pleat. At the end of stage 14, the matured oocyte has enlarged to 137,651.92 times that of the oogonium. The results are compared with those from allied species.
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