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Quarterly Journal of Microscopical Science, Vol s3-105, 209-212, Copyright © 1964 by Company of Biologists

Further Information Concerning the Envelopes Surrounding Dipteran Eggs

R. C. KING 1

1 Northwestern University, Evanston, Illinois, U.S.A.

A centripetal migration of follicle cells, which results in a separation of egg and nurse chambers, occurs in higher dipterans like Drosophila melanogaster but not in lower dipterans like Anopheles maculipennis. In Anopheles and Drosophila, while the vitelline membrane can be secreted in the absence of the oocyte, the follicle cells must be present. This suggests that the follicle cell is the governing agent in the synthesis of the vitelline membrane. The envelopes of Drosophila embryos differ from those surrounding ovarian eggs in that a membrane about 0.04 µ thick lies directly outside the vitelline membrane. This thin layer is thought to represent a waterproofing wax which forms once the egg leaves the ovariole.






© The Company of Biologists Ltd 1964