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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).
Meganeura, The Giant Dragonfly. Meganeura were enormous dragonfly-like insects with wingspans the length of an average toddler, making them among the largest flying predatory insects in the history of the world. Their diet consisted mainly of other insects, small amphibians and the dreams of children.