Diagnosis
*Adult: The adults have a length of 15–40 mm. They have two antenodal crossveins, most postnodal crossveins aligned with crossveins behind them, quadrilateral cell almost rectangular, no supplementary intercalary longitudinal veins, and an anal vein fused with wing margin. Their antennae are seven-segmented. *Larva: Larvae have a labial mask, with short flat palps and narrow palpal setae. Premental setae are variable, median lobe is shallowly cleft; caudal gills are saccular to triquetral and strongly nodate.Ecology
Adults of Isostictidae have many common names, for example: narrow-wings, pinflies, pins, pondsitters, and wiretails. *Instream habitat: Isostictid damselfly nymphs occur in streams, rivers, and riverine pools. The adults occur along these habitats. The nymphs are found on submerged vegetation, willow roots, leaf packs and detritus. *Feeding ecology: Nymphs and adults are predators. *Habits: Nymphs of these damselflies are clingers. Adults like to rest on many different plants. *Life history: Some females of some species lay their eggs in dry twigs over lentic freshwater. Other female species may lay their eggs on the bare rocks of waterfalls.See also
* List of damselflies of the world (Isostictidae)References
{{Taxonbar, from=Q2005571 Coenagrionoidea Odonata families Odonata of Australia Odonata of Oceania Taxa named by Frederic Charles Fraser Insects described in 1955 Damselflies