Rsp family satellite evolution. Bayesian tree showing the relationship between three orthologous euchromatic RlX repeats in D. melanogaster, D. sechellia and D. simulans, and the heterochromatic Rsp-like sequences of the simulans clade species, D. erecta, and D. yakuba, and the canonical (Left and Right) Rsp repeats of D. melanogaster. The Rsp-like repeats of the simulans clade species represent the consensus of all unique Rsp-like repeats assembled from the NGS reads (see Methods) and the Rsp-like repeats of D. erecta and D. yakuba represents the consensus of all Rsp-like repeats in the WGS assembly. D. erecta has two related Rsp-like repeats: Rsp-like-1 and Rsp-like-2. Posterior probability as a percent is indicated at the nodes, with values <80% shaded in grey. The tree was rooted post-hoc at the ancestor of D. yakuba and D. erecta.