Figure 2.

Phylogenetic relationships (maximum likelihood) of species in the genus Apis (Hymenoptera) based on the nucleotide sequence of the 13 protein-coding genes in the mitochondrial genome. These sequences were separated by codon positions and for each partition, optimal models of sequence evolution were used in the maximum likelihood method using TREEFINDER, based on the corrected Akaike information criterion. Numbers next to each node represent percentage bootstrap values based on 1000 replications. Bombus hypocrita was used as an outgroup. Alphanumeric terms in parentheses indicate GenBank accession numbers.