The objective of the preliminary study of Odonates is to explore the diversity of dragonflies and damselflies (Odonata) in different habitats are Amirthi streams, Mordhana dam and Pulliyanthangal Lake in Vellore district. Totally the 30 species of Odonates including 17 species under 2 families of sub order Anisoptera and 13 species under 2 families of Sub order Zygoptera were recorded from June 2017 to May 2018. The 26 species of Odonates were documented in habitats near Mordhana dam reservoir, 25 species from near Amirthi streams and 16 species were recorded from Pulliyanthangal Lake. 30 species were recorded in all the three different habitats. Among these species, Libelluidae and Coenagrionidae were the dominant families with maximum number of species abundance in the study area. The most abundant Anisopteran species in Amirthi falls are Diplacodes trivial is and Pantalaflavescens, and in Mordhana dam and Pulliyanthangal Lake were encompass with Brachythemis contaminate. Among the Zygopteran species the most abundant species are Ceriagrion coromandelianumin the all habitats. These data will be useful in future studies and conservation of biodiversity in the studied habitats
