Cytochrome b gene genealogy of Clade A haplotypes. Statistical parsimony network was constructed using all unique Clade A haplotypes with the inferred ancestral haplotype indicated by the square. The size of the squares and ovals correspond to the haplotype frequencies. Haplotypes represented by white ovals (n = 11) were found in individuals identified as M. rutilus and haplotypes represented by grey ovals (n = 18) were found in individuals identified as introgressants. A hash mark indicates intermediate mutational steps. The parsimony criterion was met, as the number of mutational steps between any pair of haplotypes was ≤ 7.