Figure 1.

Solemya velum mitochondria and symbiont genealogies are geographically subdivided, but discordant within localities. (a) Collection localities for S. velum subpopulations. (b) Whole-genome cladograms of S. velum mitochondria and symbionts inferred by maximum likelihood and Bayesian methodologies with support values (bootstrap/posterior probability). Nodes with less than 98% posterior probability are collapsed into polytomies and identical sequences are represented as triangles. Branches and clades are colored by locality. Lines connect symbiont and mitochondrial genomes from the same host individual, indicating concordant (dashed lines) or discordant (solid lines) relationships supported by resolved (black) or unresolved (gray) topologies.