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During autumn and spring periods of 1998, 1999 and 2000, 4 taxa of macroalgae (divisions of Cyanophyta, Rhodophyta, Chrysophyta and Chlorophyta) and 78 taxa of macrozoobenthos were found in 10 localities of Pčinja River, in a part of its watercourse through Serbia. Macroalga Cladophora glomerata was the most numerous among representatives. The find of red alga Lemanea sp. which was recorded for the first time at this biotope in Serbia, is significant. From representatives of macrozoobenthos the greatest number of species was found in the groups of Epheromeroptera, Trichoptera and larvae of Diptera. Majority of species of macrozoobenthos have wide geographic distribution, and in relation to ecological factors they are mainly eurivalent forms.