The word cockroach is taken from the Spanish cucaracha. The cockroach is characterizable by a flat oval body, long stringlike antennae, and a glossy black or brown leathery integument. The head is held downward, and the mouthparts aim to the back instead of forward or downward as is the case of the majority of other insects. The male generally has two pairs of wings, unlike the female, who in some species, is wingless or has vestigial wings. The female generates eggs in egg cases (known as oothecae). These are at times held away from her body or might be adhered in protected places. After the female produces an egg case, the soft, white nymphs emerge. As their exoskeleton solidifies, it turns brown in hue. The geometry and remarkable size (particular species possess a wing measurement of over 12 cm [4.7 inches]) of cockroaches have turned them into objects of objective in the biological laboratory.
The cockroach likes a warm, humid, dark living and is often found living in tropical and other mild temperatures. Only a couple species have become pests. The insect inflicts damage upon more material than it consumes and emits a unpleasant smell. The nutrition of the roach, which should be both plant and animal products, ranges from food, paper, clothing, and books to dead insects, especially bedbugs. Insecticides can be used in roach removing.
The American cockroach (species Periplaneta americana) is 30 to 50 mm long (up to about 2 inches), reddish brown, and lives out of doors or in dark, heated indoor locations (e.g., basements and furnace rooms). In its adult life, a period of about 1.5 years, the female generates 50 or more oothecae, each containing about 16 eggs that hatch after 45 days. Nymphal life goes from 11 to 14 months. The American cockroach, a native of tropical and subtropical America, has well-developed wings. However, many species tend not to be good flyers.
The German cockroach (Blattella germanica), a common household pest and sometimes incorrectly referred to as a waterbug, is light brown with two dark stripes on the prothoracic region. The female generates the ootheca three days post mating and carries it for generally around 20 days. Because it is tiny in size (about 12 mm [less than 0.5 inch] long), this cockroach generally is carried into homes in grocery bags and boxes; it has spread throughout the globe by boat. Three or more generations could live yearly. This cockroach, found in abundance around the water pipes of the Croton Aqueduct in New York City, has become labeled the Croton bug.
The brown-banded cockroach (Supella supellectilium) resembles the German cockroach but is a little bit smaller. The male has wholly developed wings and is brighter in hue 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 might be two generations a year. Eggs can be deposited in clothes, wood molding, or cracks in the floor. With the invention of heated buildings this cockroach became common in cooler climates.
The Oriental cockroach (Blatta orientalis) is thought to be one of the filthiest 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 like that of the American cockroach. The male possesses short, fully developed wings, and the female has vestigial wings. This cockroach has been carried by vehicles of business from its Asiatic origins to all the temperate regions.
Wood roaches are feral pests. Parcoblatta pennsylvanica, the common wood cockroach, may be found under logs and stones in northern latitudes. The male and female are so unlike in appearance that they were once thought to be individual species. The male, 15 to 25 mm (0.6 to 1 inch) long, has wings that expand past the abdomen; the female is smaller and has much shorter wings. Cryptocercus punctulatus consumes wood with the aid of select protozoans in its digestive tract.
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