The order Mecoptera (scorpionflies and hangingflies) is a small but ancient group
of insects with only 80+ species known to occur in North America. Fossils of true
Mecoptera are first found in the Lower Permian (perhaps as much as 275 million years
ago). The two recent families found in Oklahoma were present by the Tertiary (about
50 million years ago).
Only 9 species of Mecoptera have been found in Oklahoma. Other species are found in
the western United States or in the eastern and northeastern states. Only a few of
the eastern species have been found as far west as eastern Oklahoma.