Structures Not Present in Male Cockroach

The male cockroach lacks certain structures found in females. The chaetic sensillum, a small tube-like structure located between the first and second maxillae, contains a single terminal pore and one to seven sensory processes. It has an opening for the common salivary duct, and is covered by sensory setae on its free end. Its compound eyes are located on the dorsal surface of the head and contain about 2000 hexagonal ommatidia. They are capable of mosaic vision, a visual function that is particularly effective during nighttime.

The male cockroach has one pair of trilobed testes located on the sixth and seventh abdominal segments. It also has phallic glands, which aid in the formation of spermatophores. The female cockroach, on the other hand, has eight oothecae, which are a collection of tiny sacs located on its hindgut.

The female cockroach also has a pair of ovaries, which lead to an oviduct. The oviduct is joined to the gizzard by a stomodaeal valve. The midgut contains eight blind hepatic cae and the hindgut consists of a rectum, ileum, and colon.

The abdomen of the female cockroach is longer than that of the male. Its antennae are shorter and lack a second set of segments. The eighth and ninth terga are bifurcated and do not separate from each other. In addition, the anal styles of the female are not present in the male.