You can tell female and male cockroaches from
one another by the differences in their abdominal tips.
Females and males both have a pair of cerci, Male cockroaches also have a pair of styli.
Cerci and styli are sense organs. The female cockroach’s internal reproductive
organs consist of a pair of ovaries in which its eggs are formed, and a duct that leads
from the ovaries to the outside of the insect. Next to the duct is a pouch in which the male’s
sperms are stored. The sperms fertilize the eggs.
A gland that encloses fertilized eggs in a leathery case is also part of the reproductive
organs. This egg case is called an ootheca.
It protects the developing fertilized eggs. The ootheca can be seen protruding from a
female’s rear end before it is deposited on the ground outside the female’s body.
The male cockroach’s internal reproductive organs include a pair of testes. Sperm is
produced in each testis. Ducts lead from the testes out of the male
cockroach’s body to deliver sperm to the female cockroach.
There are a number of glands along the duct that secrete substances that help sperm fertilize