FIGURE 6 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States

FIGURE 6. Principal component analysis of head and scale linear measurements of Atlantic (blue polygon) and Gulf (red polygon) lineages of Drymarchon in the southeastern United States. Bivariate plot of factor scores for the first two principal component axes of log-transformed shape variables. Convex hulls encapsulate all data points for a particular genetic lineage found by Krysko et al. (2016). Stars represent holotype specimens for D. couperi (blue) and D. kolpobasileus (red).