The word cockroach is stemmed from the Spanish cucaracha. The cockroach is characterizable by a flattened oval body, long stringlike antennae, and a gloss black or brown leathery integument. The head is held downward, and the mouthparts are pointed to the rear instead of forward or downward as is the case in most other insects. The male usually has two pairs of wings, whereas the female, who in some species, is wingless or has vestigial wings. The female generates eggs in egg cases (labeled oothecae). These are at times held coming from her body or can be glued in protected parts. After the female produces an egg case, the soft, white nymphs emerge. As their exoskeleton hardens, it turns brown in hue. The shape and remarkable size (some species possess a wingspan measurement of higher than 12 cm [4.7 inches]) of cockroaches have become a significant objective in the biological laboratory.

The cockroach takes a warm, humid, dark living and is frequently found in tropical or other mild locations. Just a few species have become pests. The insect inflicts damage on more material than it digests and has a disagreeable odour. The food preference of the roach, which includes both plant and animal products, can be from food, paper, clothing, and books to dead insects, including bedbugs. Insecticides can be taken in roach destroying.

The American cockroach (species Periplaneta americana) is 30 to 50 mm long (up to about 2 inches), reddish brown, and inhabits out of doors or in dark, heated indoor areas (e.g., basements and furnace rooms). In its adult life, lasting about 1.5 years, the female creates 50 or more oothecae, each containing around 16 eggs that hatch after 45 days. Nymphal life goes from 11 to 14 months. The American cockroach, indigenous to tropical and subtropical America, has well-developed wings. However, the majority of species are rarely great at flying.

The German cockroach (Blattella germanica), a common household pest and is often erroneously labeled a waterbug, is light brown with two dark stripes on the prothoracic region. The female generates the ootheca three days from mating and carries it for generally about 20 days. Because it is small (about 12 mm [less than 0.5 inch] long), this cockroach generally can be taken into residences in grocery bags and boxes; it has been taken through the world by boat. Three or more generations could live yearly. This cockroach, abundant in the water pipes of the Croton Aqueduct in New York City, is commonly labeled the Croton bug.

The brown-banded cockroach (Supella supellectilium) is similar to the German cockroach but is a bit smaller. The male has wholly developed wings and is lighter in shade than the female, whose wings are stunted and nonfunctional. Both sexes have two light-coloured bands along the back. The adult life span is around 200 days, and there could be two generations in a year. Eggs can be dropped in clothes, wood molding, or cracks in the floor. With the innovation of heated buildings this cockroach became more common in cooler climates.

The Oriental cockroach (Blatta orientalis) is held as one of the dirtiest of household pests. It is oval, shiny black or dark brown, 25 to 30 mm (1 to 1.2 inches) long, with a life cycle similar to that of the American cockroach. The male has short, fully developed wings, but the female possesses vestigial wings. This cockroach has been spread by vehicles of commerce from its Asiatic origins to almost every temperate regions.

Wood roaches are non-domestic pests. Parcoblatta pennsylvanica, the common wood cockroach, is found beneath logs and stones in northern latitudes. The male and female are so unlike in appearance that they were first considered separate species. The male, 15 to 25 mm (0.6 to 1 inch) long, possesses wings that go past the abdomen; the female is smaller and possesses much shorter wings. Cryptocercus punctulatus consumes wood with the assistance of particular protozoans in its digestive tract.

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