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Two new species of Ecdyonurus Eaton of lateralis (Curt.) group (Ephemeroptera, Heptageniidae) from the Crimea and Western Caucasus
Dwa nowe gatunki Ecdyonurus Eaton z grupy lateralis (Curt.) (Ephemeroptera, Heptageniidae) z Krymu i zachodniego Kaukazu