The word cockroach is rooted in the Spanish cucaracha. The cockroach is characterizable by a flat oval body, long threadlike antennae, and a shining black or brown leathery integument. The head is directed downward, and the mouthparts are pointed rearward instead of forward or downward as is the case of most other insects. The male frequently has two pairs of wings, but the female, who in some species, is wingless or possesses vestigial wings. The female creates eggs in egg cases (labeled oothecae). These are on occasion held coming from her body or can be glued in protected places. After the female generates an egg case, the soft, white nymphs emerge. As their exoskeleton hardens, it turns brown in appearance. The form and large size (particular species demonstrate a wing span measurement of upwards of 12 cm [4.7 inches]) of cockroaches have made them objects of study in the biological laboratory.
The cockroach prefers a warm, humid, dark habitat and is more often than not found thriving in tropical and other mild areas. Just a small number of species have become pests. The insect inflicts damage upon more material than it eats and possesses a unpleasant smell. The food preference of the roach, which is both plant and animal produce, ranges from food, paper, clothing, and books to dead insects, especially bedbugs. Insecticides could be preferred in roach removal.
The American cockroach (species Periplaneta americana) is 30 to 50 mm long (up to about 2 inches), reddish brown, and lives outside or in dark, heated indoor places (e.g., basements and furnace rooms). During adult life, a time of about 1.5 years, the female deposits 50 or more oothecae, each possessing 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, possesses well-developed wings. However, the majority of species are not often gifted at flying.
The German cockroach (Blattella germanica), a common pest in the household and sometimes incorrectly thought of as a waterbug, is light brown with two dark stripes on the prothoracic area. The female deposits the ootheca three days from mating and carries it for about 20 days. Because it is tiny in size (about 12 mm [less than 0.5 inch] long), this cockroach generally can be carried into houses in grocery bags and boxes; it has been taken between nations by ship. Three or more generations could live yearly. This cockroach, found in abundance throughout the water pipes of the Croton Aqueduct in New York City, is known as the Croton bug.
The brown-banded cockroach (Supella supellectilium) closely resembles the German cockroach but is a bit smaller. The male possesses completely 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 generally around 200 days, and there can be two generations annually. Eggs may be deposited in clothes, wood molding, or cracks in the floor. With the introduction of heated buildings this cockroach became more common in cooler climates.
The Oriental cockroach (Blatta orientalis) is thought of as 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 similar to that of the American cockroach. The male possesses short, fully developed wings, but the female has vestigial wings. This cockroach has been distributed in vehicles of commerce from its Asiatic origins to every temperate regions.
Wood roaches are wild pests. Parcoblatta pennsylvanica, the common wood cockroach, is found in logs and stones in northern latitudes. The male and female are so differing in appearance that they were initially considered individual 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 eats wood with the help of some protozoans in its digestive tract.
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