Figure 2

Minimum-spanning trees (MSTs) for (a) Neritina canalis and (b) Neripteron dilatatus. The circles are sized proportionally to the frequency of occurrence, ranging from 1 to 15 in N. canalis and from 1 to 36 in N. dilatatus. All haplotypes are separated by one mutational step unless denoted by a higher number of hatch marks.