Freshwater Hydrocharitaceae of Bangladesh is represented by 6 genera namely, Hydrilla, Blyxa, Nechamandra, Vallisneria, Ottelia and Hydrocharis (Khan and Halim 1987). Under these genera 9 species have been reported so far. Another member of the Hydrocharitaceae Egeria densa Planchon commonly known as Brazilian elodea is native to the coast of southeastern Brazil through Argentina, was also cultivated as an aquarium plant in the tropical fish business. In Bangladesh Egeria densa did not found till 2009. The plant material of Egeria densa was collected in a remote natural lake of Bangladesh...