Figure 2.

Range maps for various introgressing species. (a) T. amoenus and T. ruficaudus in the Inland Northwest. T. r. ruficaudus occurs east of the black line and T. r. simulans occurs west of it. T. a. canicaudus, in gray shading, has experienced ancient capture of mtDNA that is sister to T. r. simulans mtDNA. (b) The T. quadrivittatus group of the central and southern Rockies. Although T. rufus has a partially overlapping range with T. umbrinus and T. dorsalis, there are no known localities where it is sympatric with either. (c) Ranges of T. minimus and taxa that are monophyletic for hapolgroups nested within widespread T. minimus. T. panamintinus and T. speciosus (in the inset) each appear to have become fixed on introgressions from T. minimus, whereas T. alpinus is likely a very recent derivative of T. minimus.