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A general problem with all oxygen related explanations of the giant dragonflies is the circumstance that very large Meganeuridae with a wing span of 45 cm also occurred in the Upper Permian of Lodève in France, when the oxygen content of the atmosphere was already much lower than in the Carboniferous and Lower Permian.
Lucas, S. G., 2005, Dicynodon (Reptilia: Therapsida) from the Upper Permian of Russia: biochronologic significance: In: The Nonmarine Permian; edited by Lucas, S. G., and Zeigler, K. E., New Mexico Museum of Natural History & Science, Bulletin 30, p.