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Wings may have evolved from appendages on the sides of existing limbs, which already had nerves, joints, and muscles used for other purposes. These may initially have been used for sailing on water, or to slow the rate of descent when gliding. Two insect groups, the dragonflies and the mayflies, have flight muscles attached directly to the ...
Diptera is a large order containing more than 150,000 species including horse-flies, [a] crane flies, hoverflies, mosquitoes and others. Flies have a mobile head, with a pair of large compound eyes , and mouthparts designed for piercing and sucking (mosquitoes, black flies and robber flies), or for lapping and sucking in the other groups.
The airspeeds in this region are typically lower than the flight speed of the insect, allowing them to travel against the wind if need be. These 'boundary-layer' migrants include the larger day-flying insects, and their low-altitude flight is easier to observe than that of most high-altitude windborne migrants. [3]
Its body is 10–14 mm (0.39–0.55 in) in length – slightly larger than a house fly – and has brilliant, metallic, blue-green or golden coloration with black markings. It has short, sparse, black bristles and three cross-grooves on the thorax. The wings are clear with light brown veins, and the legs and antennae are black.
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]
Dragonfly nymphs vary in form with species, and are loosely classed into claspers, sprawlers, hiders, and burrowers. [17] The first instar is known as a prolarva, a relatively inactive stage from which it quickly moults into the more active nymphal form. [37]
Why some airlines' planes fly slower than others. Ethan Wolff-Mann. September 17, 2021 at 3:36 PM ... In other words, speed is dictated by the airline’s goals, be they on time performance ...
Light conditions during development affect daily activity patterns in Drosophila melanogaster, where flies raised under constant dark or light are less active as adults than those raised under a 12-hour light/dark cycle. [96] Temperature is one of the most pervasive factors influencing arthropod development.