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; order Odonata, suborder Zygoptera)

Family of damselflies that resemble the Anisoptera (true dragonflies) in their habit of resting with their wings open. They are distinguishable from all other zygopteran families by having five or more antenodals, of which the first two are thickened and the rest are incomplete. The robust larvae are adapted for clinging to rocks in fast-flowing streams, and have large, saccoid, tracheal gills. The family is mainly tropical, and 19 extant species have been described.

Subjects: Zoology and Animal Sciences.

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