Read e-book online A Guide to Medical Entomology PDF

By M. W. Service (auth.)

ISBN-10: 0333233824

ISBN-13: 9780333233825

ISBN-10: 1349163341

ISBN-13: 9781349163342

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1 Diagrammatic representation of an adult female anopheline mosquito. and (3) a fringe of scales along the posterior margin of the wings. Mosquitoes are slender and relatively small insects, measuring about 4-6 mm in length, although some species can be as small as 2- 3 mm while others may be as long as 10 mm. The body is distinctly divided into a head, thorax and abdomen. The head is more or less globular in shape and has a conspicuous pair of kidney-shaped compound eyes. Between the eyes arises a pair of filamentous and segmented antennae, which in females have whorls of short hairs between the segments (that is pilose antennae) but in males, with a few exceptions in genera of no medical importance, the antennae have many long hairs giving them a feathery or plumose appearance.

3a). The wings are long and relatively narrow. 4). The veins are covered with scales which are usually brown, black, white or creamy yellow, but more brightly coloured scales may occasionally be present. The shape of the scales and the pattern they form differs considerably both in different genera and species of mosquitoes. 4). In life the wings of resting mosquitoes are placed across each other over the abdomen in the fashion of a closed pair of scissors. The legs of the mosquito are long and slender, consisting of a short coxa and trochanter, a long femur and tibia and a long five-segmented tarsus, which terminates in, usually a pair, of toothed or simple claws.

This is known as species replacement. Other methods aim to select genes that cause large distortions in the sex ratio, so that excessive numbers of male mosquitoes are produced. Not only are males non-vectors, but introducing a distorted sex ratio gene into populations should lead to reductions in population size. Sterile-male release techniques involve the production and release into the field of male mosquitoes that are sterile. Sterilisation can be achieved in the laboratory by several methods, such as radiochemical irradiation, use of chemosterilants (for example apholate, hempa, tepa, metepa) or production of infertile hybrid males by crossing closely related species.

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A Guide to Medical Entomology by M. W. Service (auth.)

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