Fig 6. Projection of the phylogeny for the Oncomelania (A) and Schistosoma japonicum (B) populations onto a topographic map.

Plotted using Marble Virtual Globe (open source). The nodes in red indicate key divergence events and are numbered chronologically (see Discussion for details). The blue arrows show the polarity of initial radiation according to the East to West hypothesis and the green arrow a later back colonisation. For an interactive projection please use the kml files for these maps (S1 Dataset) provided in the Supporting Information.