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A dragonfly is an insect belonging to the order Odonata, suborder Anisoptera (from Greek Î±Î½Î¹ÏÎ¿Ï anisos uneven + ÏÏÎµÏÎ¿Ï pteros, wings, because the hindwing is broader than the forewing).ossils of very large dragonfly ancestors in the Protodonata are found from 325 million years ago (Mya) in Upper Carboniferous rocks; these had wingspans up to about 750 mm (30 in).
Physical Description. Adult dragonflies have long, thin, needle-like bodies, which is why they're sometimes referred to as devil's darning needles. All species have six legs, two pairs of wings, disproportionately large eyes, short thoraxes and long abdomens that are split into 10 segments.