Ini adlaah ordo paling besar dan paling beragam dalam serangga paleozoikum. Masih merupakan perdebatan apakah Paraplecoptera, Protorthoptera, Protoperlaria (family Lemmatophoridae), dan Protoblattoidea merupakan ordo terpisah atau satu kesatuan

Bacaan lanjut
E. F. Reik, 1970, "Fossil History", in Insects of Australia, Melbourne University Press, p.177
Tan, J. J. 1991. An approach to the origin of Coleoptera. Scientific Treatise on Systematic and Evolutionary Zoology 1:5-8.

Tillyard, R. J. 1931. Kansas Permian insects. Part 13. The new order Protelytroptera, with a discussion of its relationships. American Journal of Science 21:232-266.

Sumber gambar

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