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The Diptera is a very large and diverse order of mostly small to medium-sized insects. They have prominent compound eyes on a mobile head, and (at most) one pair of functional, membraneous wings, [1] which are attached to a complex mesothorax. The second pair of wings, on the metathorax, are reduced to halteres
External images For terms, see: Morphology of Diptera. Wing length: 6.5–8.75 mm (0.256–0.344 in). This species closely resembles Melangyna ericarum, but the thorax has pale hairs on the disc (many black hairs in M. ericarum). The jowls have only pale hairs below the eyes, whereas M. ericarum has some black hairs.
In the flexed wing, the outer squama of the alula is turned upside down above the inner squama, the latter not being affected by the movement of the wing. In many Diptera, a deep incision of the anal area of the wing membrane behind the single vannal vein sets off a proximal alar lobe distal to the outer squama of the alula. [38]
A calypter is either of two posterior lobes of the posterior margin of the forewing of flies between the extreme posterior wing base and the alula, which covers the halteres. [ 1 ] The lower calypter is the proximal calypter (synonyms: squama (of some authors), tegula) and the upper calypter is the distal calypter (synonym: squamula).
Diptera is an order of winged insects commonly known as flies. Diptera, which are one of the most successful groups of organisms on Earth, are very diverse biologically. None are truly marine but they occupy virtually every terrestrial niche. Many have co-evolved in association with plants and animals.
External images For terms see Morphology of Diptera Wing length 6·25–10 mm. Eyes hairy. Tergites 3 and 4 with equal-sized yellow patterns. Tergite 2 pale pattern always present, as broad as or broader than pattern on tergites 3 and 4.Face with black longitudinal stripe. Female sternite 2 black at hind margin and dust spots on frons faint.
External images For terms see Morphology of Diptera Wing length 7·25–9 mm. Males only four spots on the abdomen. Female tergites black, pale abdominal markings absent. Eyes with short hairs. The male terminalia are figured by Hippa (1968) ). [3] Larva described and figured by Rotheray (1994). [4] See references for determination. [5] [6] [7] [8]
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]