| The paper deals with the diversity and distribution of Ostracoda from the different localities of five selected districts of Tamil Nadu. The present study is comprises of 23 species of Ostracoda belonging to, 1 order, 14 genera under 2 families from Villupuram, Trichy, Thiruvannamalai, Nilgiri & Chennai districts of Tamil Nadu. Of the 23 species recorded five species viz., Strandesia saetosa Hartmann, 1964, Heterocypris incongruens (Ramdhor, 1808), Cyprinotus cingalensis Brady, 1886, Stenocypris distincta Victor & Fernando, 1978 and Oncocypris voeltzkowi G. W. Muller, 1898 are new reports to the state of Tamil Nadu. The most dominant species of Ostracoda was Cypris granulata Daday, 1898 which was recorded from all other districts except from Nilgiri. The diversity of Ostracods species were more in the district of Trichy when compared to the other selected districts.
Key words: Ostracoda, Diversity, Distribution, Species, Tamil Nadu.
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