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
Endangered Species Act Amendments of 1978 Endangered Species Act Amendments of 1978 The Endangered Species Act (ESA) was first passed in 1973 and forms the basis of biodiversity and endangered species protection in the United States. The original purpose of the Endangered Species Act of 1973 was to prevent species endangerment and extinction due to the human impact on natural ecosystems. The three most powerful sections of the ESA are Sections 4,7 and 9. Section 4 allows the Secretaries of Interior and Commerce to list species as threatened or endangered based on best available data. Section 7 requires federal agencies to consult with Fish and Wildlife