Steleopteridae is a family of extinct winged damselflies whose fossils have been found in modern Germany, Great Britain and Kazakhstan, and which lived at the end of the Jurassic and the beginning of the Cretaceous (166.1–130.0 million years ago).
[1] The family was described by the Austrian paleoentomologist Anton Handlirsch in 1906 on the basis of the fossilised exoskeleton Steleopteron deichmuelleri.
In 2001, the family was excluded from the Epiproctophora and transferred into a suborder of winged damselflies, Zygoptera.
[4] Until 2018, it had been believed that Steleopteridae became extinct in the Jurassic, but the discovery of Steleopteron cretacicus showed that the family may have become extinct as late as the Cretaceous.
[1] According to the Fossilworks Database website, as of November 2019, the family includes 5 extinct species:[1]