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Mayflies (Ephemeroptera) of East-European Plain list contains all species found in the European part of Russia (except for Caucasus), as well as plains species known from neighbouring countries - Lithuania, Latvia and Ukraine (web archive site)
Mayflies of Central America primary basis of the initial versions of The Mayflies of Central America is Los Efemeropteros (Ephemeroptera) de la America Central by W P McCafferty and C R Lugo-Ortiz, published in 1996 in Revista Nicaraguense de Entomologica - the list herein is entirely alphabetical but recognizes the same higher classification as that used for The Mayflies of North America