The word cockroach is taken from the Spanish cucaracha. The cockroach is recognized by a flat oval body, long stringlike antennae, and a shiny black or brown leathery integument. The head is held downward, and the mouthparts are aimed to the back instead of forward or downward as is the case of almost all other insects. The male frequently has two pairs of wings, whereas the female, who in some species, is wingless or possesses vestigial wings. The female produces eggs in egg cases (labeled oothecae). These are occasionally held coming out from her body or might be glued in protected areas. After the female generates an egg case, the soft, white nymphs emerge. As their exoskeleton hardens, it turns brown in shade. The form and big size (some species possess a wing span measurement of more than 12 cm [4.7 inches]) of cockroaches have turned them into a keen interest in the biological laboratory.
The cockroach likes a warm, humid, dark living habitat and is usually found in tropical or other mild climates. Just a couple of species have become pests. The insect harms more material than it digests and has a disagreeable scent. The food preference of the roach, which includes both plant and animal produce, can be from food, paper, clothing, and books to dead insects, especially bedbugs. Insecticides can be taken in roach termination.
The American cockroach (species Periplaneta americana) is 30 to 50 mm long (up to about 2 inches), reddish brown, and inhabits outdoors or in dark, heated indoor spaces (e.g., basements and furnace rooms). In adult life, lasting about 1.5 years, the female creates 50 or more oothecae, each holding about 16 eggs that hatch after 45 days. Nymphal life goes from 11 to 14 months. The American cockroach, originally from tropical and subtropical America, has well-developed wings. However, the majority of species are unlikely to be gifted flyers.
The German cockroach (Blattella germanica), a common household pest and is on occasion incorrectly called a waterbug, is light brown with two dark stripes on the prothoracic region. The female creates the ootheca three days after mating and carries it for generally about 20 days. Because it is miniature (about 12 mm [less than 0.5 inch] long), this cockroach frequently can be introduced into households in grocery bags and boxes; it has moved between nations by ship. Three or more generations may occur yearly. This cockroach, abundant around the water pipes of the Croton Aqueduct in New York City, is labeled the Croton bug.
The brown-banded cockroach (Supella supellectilium) resembles the German cockroach but is even smaller. The male possesses totally developed wings and is brighter in shade than the female, whose wings are undeveloped and nonfunctional. Both sexes have two light-coloured bands across the back. The adult life span is generally around 200 days, and there can be two generations annually. Eggs may be left in clothes, wood molding, or cracks in the floor. With the introduction of heated buildings this cockroach became established in cooler areas.
The Oriental cockroach (Blatta orientalis) is held to be one of the most disgusting 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 resembling that of the American cockroach. The male has short, fully developed wings, but the female has vestigial wings. This cockroach has been distributed by vehicles of commerce from its Asiatic origins to all the temperate regions.
Wood roaches are feral pests. Parcoblatta pennsylvanica, the common wood cockroach, habits beneath logs and stones in northern latitudes. The male and female are so varied in appearance that they were first believed to be separate species. The male, 15 to 25 mm (0.6 to 1 inch) long, possesses wings that extend beyond the abdomen; the female is smaller and possesses much shorter wings. Cryptocercus punctulatus digests wood with the assistance of certain protozoans in its digestive tract.
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