Fig 5. Maximum-likelihood phylogeny of Eastern Indigo Snakes (Drymarchon couperi) and outgroups inferred from sequence data from the mitochondrial loci cytochrome b and ND4.

Indigo snake samples are labeled by hypothetical lineage, state, county, and sample numbers from [26]. Colors: blue = Atlantic lineage, orange = Gulf lineage. Bootstrap support is listed for major nodes.