Maximum Likelihood tree reconstructed from a concatenated dataset of three mitochondrial genes (cyt b, ND4 and 16S) for almost all the species of pit vipers found in Peninsular India and the Indo-Burmese sub region. The tree shows two separate major clades (Clade A & B). Clade A includes all peninsular Indian species along with a few taxa from Southeast Asia, while clade B predominantly comprises species from other parts of central India, China and Southeast Asia.