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The order Diptera, commonly known as true flies, is characterized by the possession of a single pair of functional forewings, while the hindwings are reduced into small knob-like structures called halteres, which act as balancing organs during flight. This feature is one of the most distinctive morphological traits separating Diptera from other insect orders. The body is generally small ___ __________ ___ ________ _______ ___ _______ ______.
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