Cockroaches belong to the insect order Blattodea of which there are approximately 4,000 species worldwide and 400 species native to Australia. Native species vary in appearance, habitat and feeding habits.
All species are thought to have originated in the tropical and sub-tropical areas of Africa around 300 million years ago. They range in size from just a couple of millimetres in length right up to an enormous 70 millimetres in the case of the Giant Burrowing Cockroach (Macropanesthia rhinoceros) from northern Queensland.
Adult German cockroaches average about 1.5 cm in length. They have long antennae which they use to detect chemicals, moisture, air currents, and probably sound waves in their environment. They prefer warm, moist area, and are frequently found in kitchens and bathrooms. They are brown coloured with two dark parallel streaks running from the head to the base of the wings. Female cockroaches carry their ootheca with her during the germination rather than depositing it like other species.
They are large roaches, ranging in length up to 4 cm. They prefer dark, moist, warm areas. They are commonly found in basements, steam tunnels, boiler rooms, rubble foundations, and similar places. Often they aren’t even noticed until a light is turned on, and they scurry away rapidly. Adult of both sexes have working wings and at least some flight capability, but oddly enough, they seldom fly.
They are 1.5 cm length as adults. Adults of both sexes have wings, although only the males fly. Brown-banded cockroaches have two light-coloured bands running across the base of their wings, hence the name “brown-banded cockroach”. Compared to other common roaches (such as the German cockroach) brown-banded cockroaches tend to prefer drier conditions. They’re commonly found in bedrooms (especially in cabinets and night tables), in closets, behind peeling wallpaper, and inside electrical and electronic equipment.
Brown cockroaches are large species of cockroaches. They are about 3-4 cm long and have wings. They are dark, reddish brown in colour. The brown cockroaches can be distinguished from American cockroaches by observing their cerci, which are two pointed barbs, or spines, near the posterior end of some cockroaches. Brown
cockroaches have a pair of blunt, short and dark cerci while the American cockroaches have longer and sharp pointed cerci.
Australian cockroaches are also large species of cockroaches. They are winged and can be about 3-4 cm in length. They are dark brown in colour. Australian cockroaches are very similar to American cockroaches but can be distinguished by a yellow margin on the thorax and yellow streaks as its sides near the wing base. They normally feed on plants unlike other cockroaches and can also feed on different organic substances including decaying substances.
They are brownish yellow in colour, smaller in size (12-15 mm) compared to German or American cockroaches. Adult males have longer wings which may extend till the abdominal tip. Adult females have shorter wings which may cover only one-third of its abdomen.