South Asian river dolphin display the variances needed to support their classification as separate species. Thus, at present, a single species with two subspecies is recognized in the genus "Platanista", "P. g. gangetica" (Ganges river dolphin) and "P. g. minor" (Indus river dolphin). An assessment of divergence rates in mitochondrial DNA of the two subspecies indicates that they diverged from a common ancestor around 550,000 years ago. This ancestor is thought to have been a marine Platanistid inhabiting the epi-continental seas in South Asia during the sea level rises in the middle Miocene. The earliest fossil identified as belonging to the species is only
California Endangered Species Act will be handled by the Habitat Conservation Planning Branch. The process includes reviewing a region where the species is in habitation, conducting a visit to where the species is, and presenting a report. After 90 days of the petition, the Habitat Conservation Planning Branch sends the report to the director for approval. If the petition is approved the species becomes a candidate species. As of March, 2015, CESA lists 49 animals as Endangered and another 37 as Threatened. An additional 4 species are candidates for listing as either threatened or endangered. No species are proposed for delisting. As of April,