Question

Male and female cockroaches be distinguished externally by?

Answer 1

In cockroaches, present at the posterior region, males bear a pair of short thread like-structures, which are absent in females. The male cockroaches are smaller in size rather than the female cockroaches. The sternum of mesothorax is bifurcated in the male. The antennae of the females are larger than that of the males.

Complete answer:
Through anal style, male and female cockroaches can be distinguished externally which is present only in males and absent in female cockroaches. It is thin paired, with an unjointed outgrowth project backwardly from the sides of the of male cockroach. There is a male sex structure that helps in the intercourse and that is known as the Anal styles. In the arthropods, this is found and it looks like a thread-like structure. In contrast, to this anal cerci is found is found in females.

Hence, the males and the females cockroaches can be distinguished externally through – ‘Anal styles in male’.

Note:
For many years, cockroaches have been evolving into a number of the foremost adaptable pests on the Earth. Without its head, a cockroach can survive for a week because of their open cardiovascular system. On human food they prey and also spread germs that cause disease.