Figure 6. Species delineation of Eurasian ground squirrels by refined single linkage (RESL) analysis showed on the gene tree.

Square brackets indicate putative species recognized by RESL. Barcode Index Numbers (BIN) assigned to each putative species are given as BOLD:XXXXXXX. Species split by RESL are red colored, while merged species are blue colored. ML tree (HKY+I+G model) of 657 bp COI fragment. Bootstrap values above 50 are indicated. The nodes with multiple specimens were collapsed to a triangle, with the horizontal depth indicating the level of intraspecific divergence. Individuals with introgressed mtDNA are not included into the tree.