Phylogenetic tree. The neighbor-joining phylogenetic tree of cytochrome b of the eastern and western clades of B. bankorensis, B. gargarizans, and B. japonicus (sequence AB159256.1 from NCBI GenBank). The phylogenetic tree was analyzed by Mega 4. B. japonicus was used as an outgroup. B. gargarizans (BG1, BG2, BG3, and BG4) was from China. The eastern (Bu5 and Bu6) and western clades (Bu7, Bu8, Bu9, Bu10, Bu11, and Bu12) were from the Jhuzihu area, Taiwan (labeled location number 1 in Table 1).