Distribution of the different populations belonging to the four southern species based on the scores of the first and second discriminant function. Classification of species based on [29,30] (4 - 7: N. leucogenys; 8 - 12: N siki; 13 - 20: N. annamensis; 21 - 24: N. gabriellae). Blue circles indicate population centroids.
Thinh et al. BMC Evolutionary Biology 2011 11:36 doi:10.1186/1471-2148-11-36