Mitochondrial (COI and 16S) time-calibrated tree and species delimitation results. Numbers at nodes are posterior probabilities (not shown if < 0.7). Turquoise bars indicate 95% confidence intervals for node ages (shown only for supported nodes). Bars on the right depict the results of the species delimitation analyses (abbreviations: Morpho, morphology; BIN, Barcode Index number; GMYC, General Mixed Yule Coalescent; PTP, Poisson Tree Processes; ASAP, Assemble Species by Automatic Partitioning; PDT, Patristic Distance Threshold). Red stars indicate the clades of Chaetogammarus ischnus and Chaetogammarus trichiatus that were used in the multilocus Bayes factors species delimitation approach.