Marine systems appear to be more homogenous than terrestrial environments with few apparent barriers to dispersal. Despite this, population structuring and speciation are seen in organisms, even with high dispersal capabilities. For my thesis, I am studying a genus of tropical obligate near-shore dolphins and understand how speciation my have occurred in areas where no barriers are apparent and dispersal seems to have occurred across large distances in spite of conducive habitats. The study aims to resolve the taxonomic identity of the Sousa spp. complex in India, and examine population structure and connectivity for the Indian animals and understand how they place in the global phylogeny for the genus.