Regulation of last reproduction steps in tsetse flies (Glossina:Diptera)

Abstract

and 2Newoendocrinologie des Znsectes, CNRS UA 669, Universitt! P. and M. Curie, 12, rue Cuvier, 75252 Paris Ckdex 05, FranceThe regulation of ovulation and parturition, in the viviparous tsetse flies, constitutes a very pncisely adjusted mechanism. Indeed the process of vitekgenesis takes places, in one oocyte only, during the incubation period when the larva is nourished in utero on milk produced by the mother. Neuropeptides, biogenic amines, neurotransmitters as well as ecdysone, and 20-hydroxyecdysone and also nervous outputs regulate ovulation and pturition A model is proposed for the mechanisms controlling these processes.

Evidence of 5-hydroxytryptamine synthesis in the follicles ofSepia officinalis and direct involvement in the control of egg-laying

“…A complementary screening of several organs of the genital tract was performed using a bioassay based on the recording of the contractile activity of the distal oviduct described by Henry et al, (1997). These investigations revealed a myotropic activity in the ovary extract similar to what has been observed for insects, for example tsetse flies (Grillot and Raabe, 1989). Previously, Henry and BoucaudCamou (1993) had shown that the ovary was involved in the control of egg capsule edification.…”