Bayesian inference tree for 8090 bp of nuclear 18S rRNA, 28S rRNA and H3, and mitochondrial COI, tRNACys, tRNAMet, 12S rRNA, tRNAVal, 16S rRNA, tRNALeu and ND1 markers. Numbers on nodes indicate bootstrap (BS) values for maximum likelihood ≥ 60% and Bayesian posterior probabilities (PP) ≥ 0.90. Double asterisks denote the node with BS = 100% and PP = 1.0; single asterisk denotes the node with BS ≥ 80%, PP ≥ 0.95. Numbers in parentheses represent the mid-body somite annulation of each species. The geographical range of each group/lineage within Orobdella is also indicated.