What is a Cockroach?
The word cockroach is a corruption of the Spanish cucaracha. The cockroach is recognized by a flat oval body, long threadlike antennae, and a shiny 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 in many other insects. The male often has two pairs of wings, whereas the female, who in some species, is wingless or holds vestigial wings. The female creates eggs in egg cases (called oothecae). These are at times held coming out from her body or could be glued in protected areas. After the female produces an egg case, the soft, white nymphs emerge. As their exoskeleton toughens, it turns brown in hue. The shape and big size (particular species possess a wing measurement of over 12 cm [4.7 inches]) of cockroaches have become a significant interest in the biological laboratory.
The cockroach enjoys a warm, humid, dark living habitat and is frequently thriving in tropical or other mild temperatures. Only a couple species have become pests. The insect harms more material than it digests and possesses a unpleasant odour. The nutrition of the roach, which should be both plant and animal product, ranges from food, paper, clothing, and books to dead insects, especially bedbugs. Insecticides could be preferred in roach killing.
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 locations (e.g., basements and furnace rooms). In adult life, lasting about 1.5 years, the female drops 50 or more oothecae, each holding about 16 eggs that hatch after 45 days. Nymphal life takes from 11 to 14 months. The American cockroach, originally from tropical and subtropical America, possesses well-developed wings. However, the majority of species are rarely good at flying.
The German cockroach (Blattella germanica), a common household pest and is often erroneously thought of as a waterbug, is light brown with two dark stripes on the prothoracic region. The female creates the ootheca three days post mating and carries it for about 20 days. Because it is small in size (about 12 mm [less than 0.5 inch] long), this cockroach generally is carried into residences in grocery bags and boxes; it has gone from nation to nation by boat. Three or more generations may breed yearly. This cockroach, found in abundance throughout the water pipes of the Croton Aqueduct in New York City, is called the Croton bug.
The brown-banded cockroach (Supella supellectilium) is like the German cockroach but is even smaller. The male has totally developed wings and is paler in shade than the female, whose wings are stunted and nonfunctional. Both sexes have two light-coloured bands across the back. The adult life span is roughly 200 days, and there might be two generations annually. Eggs can be dropped in clothes, wood molding, or cracks in the floor. With the invention of heated buildings this cockroach became more common in cooler climates.
The Oriental cockroach (Blatta orientalis) is held 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 resembling that of the American cockroach. The male has short, fully developed wings, while the female possesses vestigial wings. This cockroach has been spread by vehicles of trade from its Asiatic origins to 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 differing in appearance that they were originally seen as individual species. The male, 15 to 25 mm (0.6 to 1 inch) long, has wings that go beyond the abdomen; the female is smaller and has much shorter wings. Cryptocercus punctulatus digests wood with the assistance of certain protozoans in its digestive tract.
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