Abstract
Microalgae have a key role in maintaining life on Earth. They comprise both the base of the food chain and act as major oxygen producers. Microalgae are also beneficial to aquatic ecosystems and make an excellent indicator of water pollution. The present study is an attempt to explore and take taxanomic account of the algal diversity found at the Peechi Dam, which lies across Manali River, a tributary of the Karuvannur River, Thrissur District, Kerala, that lies at 76&deg;22'E longitude and 10&deg;31'N latitude. Karuvannur River is one of the major freshwater sources of the Thrissur district, which flows through the famous Kole lands of Thrissur. The study was carried out over a period of one year, from June 2017 to May 2018. During the period of study, 48 species of phytoplankton were identified which come under 31 genera belonging to ten taxonomic classes. Out of these 10 species each belong to <i>Chlorophyceae</i> and <i>Zygnematophyceae</i> followed by <i>Bacillariophyceae</i> (9 species), <i>Euglenophyceae</i> (8), <i>Cyanophyceae</i> (5), <i>Xanthophyceae</i> (2), <i>Trebouxiophyceae</i> (1), <i>Coscinodiscophyceae</i> (1), <i>Mediophyceae</i> (1) and <i>Dinophyceae</i> (1). Two of the species <i>Xanthidium octocorne</i> Ehr. ex Ralfs and <i>Tetraplektron torsum</i> (Turner) Dedusenko-Scegoleva are new to Kerala.
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