Fig. 1.

Sampling sites of Pyura praeputialis along the coast of (A) Australia and (B) within Antofagasta Bay on the Chilean coastline. The bar plots in A and B represent the results of the ADMIXTURE clustering analysis inferred with neutral loci at K = 2 (see full details in SI Appendix). (C) The most likely scenario, as revealed using approximate Bayesian computation (see full details in SI Appendix), depicts the most likely evolutionay scenario and invasion route that P. praeputialis followed from Australia to Antofagasta Bay.