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Adults are small (< 2 millimetres (5 ⁄ 64 in)) to medium-sized insects (- < 10 millimetres (25 ⁄ 64 in)). Larger Diptera are rare, only certain families of Diptera Mydidae and Pantophthalmidae reach 95–100 millimetres (3 + 3 ⁄ 4 –4 in) wingspan while tropical species of Tipulidae have been recorded at over 100 millimetres (4 in).
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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.
For terms see Morphology of Diptera. Wing venation. Dixidae are small (body length not more than 5.0 mm) slender gnats with thin legs. Adults are black to yellowish-brown. [4] The head is relatively broad. The antennae are thin and the flagellum has 14 segments. The proboscis is short and thick and the palpi are five-segmented.
External images For terms see Morphology of Diptera Wing length Wide abdomen with yellow marks. Thoracic dorsum polished black. Male with round marks on tergite 2 and confluent marks on tergites 3 and 4 (as a deeply incised band). Female with oval marks on tergite 2 and square marks on tergites 3 and 4. legs mainly orange. Antenne orange.
A single large wing from a species of Diptera in the Triassic (10 mm instead of usual 2–6 mm) was found in Australia (Mt. Crosby).This family Tilliardipteridae, despite the numerous 'tipuloid' features, should be included in Psychodomorpha sensu Hennig on account of loss of the convex distal 1A reaching wing margin and formation of the anal loop.
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]
External images For terms see Morphology of Diptera Wing length 8·25– 11 mm. Halteres with yellow knob. Face yellow, at most the tip of the central knob dark.