Maximum-likelihood (10000 bootstrap repeats) and Bayesian inference (100,000 generations) tree showing phylogenetic relationships among seven Monomorium species based on 13 protein-coding genes (PCGs) from complete mitochondrial genome sequences. Two Solenopsis species were used as the outgroup. The phylogenetic tree shown is based on the maximum-likelihood tree. The new species, M. brachypterum, is shown in bold. The numbers above the branches indicate maximum-likelihood bootstrap support (left) and Bayesian inference posterior probability (right). Original sequences and trees are available in Suppl. materials 6–8.