Phylogenetic tree of mtDNA ND2 haplotypes (left) and the species tree based on ND2 sequences (right).

<p>Palearctic clades are identified by subspecific names. Nearctic clades are identified by letters (A - E) due to overlap of their ranges. Numbers next to branches show their posterior probability. Gray bars next to nodes indicate their 95% HPD interval for the node age. Scale below each tree indicates time in million years (Ma).