Figure 2.

Alternative speciation models. A) Peripatric speciation model: a small founding population of M. griseorufus (purple) diverged from the widespread common ancestor (transparent blue) and then expanded in size. B) Allopatric speciation with subsequent range expansion model: a localized admixed common ancestor underwent divergence, after which M. murinus greatly expanded its range throughout the west (blue arrows), while expansion in M. griseorufus was relatively limited to the south.