No abstract

The purpose of this study is to examine the effects of neurosecretory material (NSM) in Corpus Allatum (CA) of endoparasitic Pimpla turionellae L. on reproduction. For this purpose, the egg maturation of the insect and the amount of the NSM in CA of the serial section of the brain were studied. Egg maturation was determined by measuring the terminal oocyte length. In order to determine the amount of the NSM in CA the neurosecretory granules of which were stained by paraldehyde fuchsin are considered. The egg maturation of P. turionellae have performed twice. The NSM intensity in CA continued increasingly from the first day of egg development until the first oviposition days; and reached the maximum level before the second egg maturation phase. These observations showed that the NSM in CA of this insect may be related to egg development.

The anatomy and the histology of the brain and the retrocerebral endocrine glands of the adult P. turionellae have been studied by staining technigues such as chrome haematoxyİin phloxine, paraldehyde fuchsin and performic acid victoria blue. Three types of neurosecretory cells were observed in the brain. They were named as Type-I, Type-II and Type-III. The neurosecre tory granules, which were stained dark purple with paraldeyde fuchsin, were present only in the Type-I cells. The same neurosecretory granules were also present in the nervi corporis cardiaci, the corpora cardiaca, and the corpora allata. It was thought that the neurohaemal organ was the corpora cardiaca and some of the neurosecretory material directly passed into haemolenph because of the fact that the amount of the neurosecretory material in the corpora cardiaca was never as abundant as in the nervi corporis cardiaci.The illustrations correlated with the histology of the brain and the retrocerebral endocrine glands of the adult P. turionellae are presented in the paper. The different types of celi in P. turionellae are compared with the neurosecretory cells described in other species.

The neurosecretory system and retrocerebral endocrine glands of A. bicolor y^eıe reveaîed by histological sections and whole mount, using Chrome Hematoxylin Phloxine and Performic Acid Victoria Blue technigues.In account for the neurosecretory granules and their staining properties, one type neutosecretory celi was identified in sections. There was no difference between the histology of neurosec retory celIs and syncytial corpora cardiaca of feınale and male individuals. It was observed that the females were bigger than the males and they had also bigger corpora allata.The median neurosecretory celIs and their emerging axons in the brain were not seen by total staining. However, in the same total stained preparates the outer parts of nerve corporis cardiaci-I and the storage lobe of the corpus cardiacum were stained in various density at different times of a day. So, it was conciuded tliat the neurosecretory materials were transported by the nervi corporis cardiaci-I and that the neurohaemal organ was corpora cardiaca in this species.