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Zygoptera (damselflies; subclass Pterygota, order Odonata) Cosmopolitan suborder of dragonflies, comprising insects with slender bodies, and two pairs of wings. Both hind and fore wings have a narrow base, and are folded over the abdomen when the insect is at rest. Damselflies are generally weak fliers, frequenting bankside vegetation. The aquatic nymphs have three elongate, tracheal gills of varying form, at the end of the abdomen. There are 18 families, containing about 3000 species.