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Abstract:
Baetis aurantiaca BURMEISTER 1839 = Ecdyonurus aurantiacus (BURM.) comb. nov. (= Ecdyonurus pazsickyi PONGRACZ 1913 syn. nov. = Ecdyonurus fluminum auct p. p. nec PICTET 1844). Rhithrogena aurantiaca auct. = Rhithrogena diaphana NAVÁS 1917. Historical and bibliographical remarks on Baetis aurantiaca BURM., including designation of a lectotype, and remarks on the distribution and differential characters of the two mayfly-species Ecdyonurus aurantiacus and Rhithrogena diaphana.