Palæos:		Insecta
INVERTEBRATES		Permothemistida

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Cladogram

Permothemis libelluloides, fore wing (modified from Jeannel, 1949a)

This is a small order of insects known from fossils from the Permian of North America and Russia. The mesothorax was greatly developed, the fore wing had a well-developed pterostigma and few cross-veins, and the abdomen ended in a pair of long cerci. It has been compared with the Megasecoptera (Protodonata), but was more probably a two-winged development from the Palaeodictyoptera. It has left no recognizable descendants.

References

E. F. Reik, 1970, "Fossil History", in Insects of Australia, Melbourne University Press, p.174

Insects

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