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The purpose of this study is to examine the effects of the neurosecretory material in corpus cardiacum (CC) on the reproduction of endoparasitic Pimpla turionellae L. For this purpose, the egg maturation and amount of the neurosecretory material in corpus cardiacum of the insects were examined by the serial cross sections. Egg maturation was determined by measuring the terminal oocyte length in the serial cross sections of the ovariole. The egg growth which has observed on the 3 rd day, reached the maximum on 15 th day and after that day the egg laying was observed. The sections of insect brains were stained by paraldehyde fuchsin . The amount of the paraldehyde fuchsin positive neurosecretory (PF + NS) material in CC was at a certain level in the first day of egg development. While terminal oocyte was reaching the maximum length, the amount of the PF + NS material in CC decreased to the minimum level. During the egg laying phase, the amount of the PF + NS material in CC reached the maximum level. These observations give us the idea that the neurosecretory material in corpus cardiacum of this insect may be related to the egg development.

The paraldehyde fuchsin positive material in corpora cardiaca of Pimpla turionellae L. (Hymenoptera:Ichneumonidae) during egg maturation