Statistics relating to each data set used in the analyses.

Length, total number of sites in alignment; Taxa, number of taxa; Length (no gaps), total number of sites excluding those with alignment gaps; H, haplotype diversity; D, Jukes-Cantor corrected nucleotide diversity based on the total number of mutations; PS, number of polymorphic sites (with parsimony informative sites in parentheses); PT, significance of Tajima's test for neutrality based on the total number of mutations. The COI+12S dataset included only the unique haplotypes.