Bayesian divergence time estimates of Exocelina diving beetles. Chronogram presenting median ages across New Guinean Exocelina derived from the best BEAST analyses based on MLE comparisons (12 uncorrelated lognormal relaxed clocks with a birth–death tree model). 95% credibility intervals are given in purple horizontal rectangles. Branch support derived from the best IQ-TREE ML tree search is given (SH-aLRT/UFBoot). A summary of the BAMM analyses is inserted in the bottom left corner of the figure showing a decrease in speciation rate through time.