Phylogenetic relationships of Gammarus species reconstructed with the ML method based on the concatenated data set (28S+COI). Since the ML, NJ, and BI methods generally yield similar topologies, only the ML phylogeny is shown. The nodes (ML, NJ, and BI) show the Bayesian posterior probabilities and the bootstrap percentage. For the support values of the nodes, ML ≥ 70%, NJ ≥ 70%, and BI ≥ 0.70 are shown. Black bars indicate OTUs. The first column shows morphology-based results, the second column shows ASAP results, and the third column shows PTP results.