Figure S1. (A) Correlation circle (magnified; right) showing loading vectors for each lateral plate's contribution to scores on PC axes 1 (abscissa) and 2 (ordinate) of the between-group PCA (Fig. 2A).

Figure S2. Box-percentile plots describing variation within morphs for relative plate coverage.

Figure S3. Assessment of plate morph classifications via DAPC (see Methods for details).

Figure S4. Dominant Eda allele frequency predicted after 1000 generations of underdominance.

Figure S5. Dominant Eda allele frequency predicted after 1000 generations of selection against homozygous recessives.

Table S1. Phenotypic and genotypic samples from each population.

Table S2. Population- and locus-specific descriptors of genetic diversity for loci putative associated with lateral plates.

Table S3. Results for tests of population-specific deviation from mutation-drift equilibrium (HWE), based on 12 neutral, polymorphic microsatellite markers.

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