Author : K.B.Nagarnaik
Abstract- The present study is aimed at the female peproductive system in relation to vitellogenesis in the aquatic beetle Cybistertripunctatus (Coleoptera :Dytiscidae).The female reproductive system is well developed in the adult female and consists of a pair of ovaries, a pair of lateral oviducts, a common oviduct, A vagina a spermatheca with a spermathecal gland and a colleterial gland. Each ovary is oval-shaped consisting about 20 to 25 ovarioles. All the ovarioles resemble with each other in shape and size and areAnteroposteriorly differentiated into a terminal filament, a germarium, a Vitellarium and a pedicel. The pedicels are long tubular stuctues in Cybistertripunctatus. The terminal filament of the ovariole is composed of a mass of small spherical epithelial cells which are deviod of cytoplasmic content. Externally, the terminal filament is covered with tunica propria. A Transverse septum is present in between the terminal filment and Germarium.
