| The paper deals with the diversity zooplankton such as Rhizopoda, Rotifera, Cladocera and Ostracoda from the different localities of Ooty, Nilgiridistrict of Tamil Nadu. The present study comprises of a total of 37 species of Zooplankton which include 3 species of Rhizopoda, 19 species of Rotifers, 12 species of Cladocera and 2species of Ostracoda from Ooty, Nilgiridistrict of Tamil Nadu.The study was conducted during the year 2013- 2014. Rotifers were the dominant group representing 19 species. The polymorphic forms of the Rotifer genera Brachionus such as Brachionus calyciflorus f. amphiceros (Gosse, 1851) and Brachionus quadridentatus brevispinous (Ehrenberg, 1832) are also recorded during the present study. The diversity of Rotifers are more when compared to the other groups.The study reports several alkaline and eutrophic species.
Keywords: Rhizopoda, Rotifera, Cladocera, Ostracoda, Diversity, Distribution, Species, Nilgiri, Tamil Nadu
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