Fig. 3

Haplotype networks of cytochrome b sequences from M. imaizumii (a) and M. wogura plus M. robusta (b) using the median-joining method [30] using PopArt. The circle color indicates the intraspecies phylogroup (Mim-I, red; Mim-II, light blue; Mim-III, blue), and the circle size reflects the number of samples. Circles with different colors indicate phylogroups within species of M. wogura (Mwo-I, pink; Mwo-II, yellow; Mwo-III, green) and M. robusta (Mwo-IV, purple). The number of bars on each branch represents the number of substitutions. Haplotype groups are marked with an asterisk when rapid expansion signals were obtained (see Table 1)