 Until 2018, it had been believed that the genus became extinct in the Jurassic, but the discovery of "Steleopteron cretacicus" showed that the genus and the family may have become extinct as late as the Cretaceous.In 2001, Fleck and others transferred the family, Steleopteridae to a suborder of winged damselflies, Zygoptera.They were fast flying insectivorous/carnivorous predators.