Table 2. Estimates of evolutionary divergence (expressed in %) over sequence pairs between groups. The number of base differences per site from averaging over all sequence pairs between groups is shown for each compared taxon. The rate variation among sites was modeled with a gamma distribution (shape parameter = 4). This analysis involved 15 nucleotide sequences with 1020 positions in the final dataset for COI (lower left corner) and nine sequences with 436 positions in the final dataset for 16S (upper right corner). All ambiguous positions were removed for each sequence pair (pairwise deletion option).