Description
The female cockroach reproductive system consists of a pair of ovaries, oviducts, vagina, spermatheca, collateral glands, genital pouch, and external genitalia.
Main Components and Structure
The ovaries are located between the 2nd and 6th abdominal segments and are composed of eight ovarian tubules or ovarioles, each containing developing ova.
Each ovary connects to an oviduct, and the two oviducts unite to form a single median oviduct, referred to as the vagina, which opens into the genital chamber.
The genital pouch (or gynatrium) is divided into two chambers: the genital chamber (where the vagina and accessory gland ducts open) and the oothecal chamber (where egg cases are formed).
Spermatheca is a pair of sperm storage sacs in the 6th abdominal segment, which store sperm received during copulation until fertilization occurs.
Accessory Glands and Egg Protection
Collateral glands are highly branched accessory glands that secrete substances forming the hard egg case, known as the ootheca, around the eggs.
The spermatheca and collateral glands both open into the genital chamber, facilitating fertilization and formation of the ootheca.
External Genitalia
The external genitalia comprises three pairs of plate-like chitinous processes arranged around the female genital apertures, sometimes called the ovipositor.
Function
During copulation, sperm from the male is deposited into the genital pouch and stored in the spermatheca.
Fertilization is internal, with ova and sperm meeting in the genital chamber.
Eggs are then encased in oothecae and released via the ovipositor.
This system ensures protected, internal fertilization and the efficient laying of eggs in a safe, chitinous enclosure.