A new paper published last month has identified a new source population for the New World: the Onge from the Andamans. Its not the Arabian Peninsula, but its in the same body of water. How on earth did they get to South America? Its 2016 and they are just now finding that a completely unrecognized (and unexpected) group from the Indian Ocean had somehow made its way to the New World. Other interesting conclusions from this paper: Previous attempts to explain New World founder group