Zoology - Structural Organisation in Animals Question with Solution | TestHub

The abdomen in both males and females consists of 10 segments. In females, the 7^thsternum is boat shaped and together with the 8^thand 9^th sterna forms a brood or genital pouch whose anterior part contains female gonopore, spermathecal pores and collateral glands. In males, genital pouch or chamber lies at the hind end of abdomen bounded dorsally by 9^thand 10^thterga and ventrally by the 9^thsternum. It contains dorsal anus, ventral male genital pore and gonapophysis. Males bear a pair of short, threadlike anal styles which are absent in females. In both sexes, the 10^thsegment bears a pair of jointed filamentous structures called anal cerci.