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Halteres
pair of small club-shaped insect organs / From Wikipedia, the free encyclopedia
Halteres are small knobbed structures modified from the hind wings in flies. They vibrate during flight, and help the insect fly better.
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The halteres evolved from wings. Ancestral flying insects had two pairs of wings, like dragonflies, hymenoptera and lepidoptera still do. Flies have only the front pair of wings.