; order Odonata, suborder Zygoptera)
Family of slender, delicate damselflies, with narrow wings, which are distinguished from other damselflies by having the first anal vein fused with the wing margins. Nymphs of many species have not been described, but those which have are generally small, with short legs, and tracheal gills of varying shape. The family occurs in the tropics, and more than 200 extant species have been described.
Subjects: Zoology and Animal Sciences.