effect of 20-hydoxyecdysone on the neurohemal endocrine organs in Hyalomma Domedarii Koch [ixodoidea: ixodidae]

ABSTRACT

Twenty ug of 20-hydroxyecdysone [20-HE] were applied topically to nymphal Hyalomma dromedarii on the day of detachment. The effect of 20-hydroxyecdysone was studied on the lateral segmental organs and on the neurohemal organs in the emerging unfed, semifed and fully engorged females, and compared with those in the untreated females. The effect induced by 20-hydroxyecdysone included [a] The lateral segmental organs in each group of treated female were comparatively larger than that in the untreated ones, and [b] the dorsal lobes of the neurohemal organs were comparatively smaller. The results suggest that the lateral segmental organs play a role in ecdysone production