Difficulties in establishing boundaries between species increase
when dealing with taxa that are scarcely divergent genetically
(Duminil and di Michele, 2009), as in the present case (Table 3).
Two possible explanations are usually given for this lack of genetic
divergence: recent speciation or gene flow (Petit and Excoffier,
2009). As demonstrated by the Structure analyses, the currently
accepted boundaries of the species do not fully coincide with the