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Rotifer Keratella cochlearis was observed in 53 out 54 lakes investigated in June-July 1988. Up to 4 morphotypes were simultaneously present in the vertical water column in mesotrophic lakes with a relic crustacean complex. There were from 1 to 3 morphotypes in other mesotrophic and eutrophic lakes and from 0 to 2 porphotypes in dystrophic ones. The lorica length of Keratella cochlearis morphotype...