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Petaluridae (dragonflies; order Odonata, suborder Anisoptera) Archaic family of large odonates in which the eyes are well separated, and the triangles of the fore and hind wings are dissimilar. The nymphs are elongate and hairy, with short, fattened legs; and are found in bogs and swamps, where they burrow in the bottom sediments. There are 10 described extant species, found in the New World, Australasia, Oceania, and the eastern Palaearctic.