MEDUSA analysis of diversification rate shifts across the generic-level phylogeny of the Sigmodontinae.

Node numbers indicate the background tempo of diversification for most sigmodontine rodents (clade 1), and the order at which unusual rate shifts were inferred by fitting MEDUSA stepwise model. Clades 2 and 3 are exceptionally diverse akodontine genera (Akodon and Oxymycterus, respectively) depicted with thicker lines. Horizontal bars indicate species richness per each genus.