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Evolution of the ways the wings at rest to the body to create wings do not fold back (recent Archaeoptera) spread laterally (large bubbles) over the back against one another (damselflies, mayflies) Folding (Neoptera) wings not foldable (e.g., stoneflies) Folding fan-fold (e.g., front wings of wasps) Cross fold (such as the rear wing of the beetle)
The wings are transparent, often hyaline or evenly colored or with bands. The alula are well developed and in the rest position the wings are kept open and horizontal in a V shape revealing the sides of the abdomen. The abdomen is generally short and wide, subglobose-shaped, cylindrical, or conical, composed of six to eight apparent urites.
A more detailed analysis of the problem shows that the work done by the wings is converted primarily into kinetic energy of the air that is accelerated by the downward stroke of the wings. The power is the amount of work done in 1 s; in the insect used as an example, makes 110 downward strokes per second.
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The majority of insects have two pairs of wings. Flies possess only one set of lift-generating wings and one set of halteres. The order name for flies, "Diptera", literally means "two wings", but there is another order of insect which has evolved flight with only two wings: strepsipterans, or stylops; [2] they are the only other organisms that possess two wings and two halteres. [6]
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Mecoptera (from the Greek: mecos = "long", ptera = "wings") is an order of insects in the superorder Holometabola with about six hundred species in nine families worldwide. . Mecopterans are sometimes called scorpionflies after their largest family, Panorpidae, in which the males have enlarged genitals raised over the body that look similar to the stingers of scorpions, and long beaklike
Adults range from 11–19 millimetres (0.43–0.75 in) in length, excluding wings and other appendages including antennae and legs. [3] Their black body has two white spots on the abdomen and their transparent wings have a distinctive black pattern. The tiger bee fly may be mistaken for a large bee due to its coloration