FIGURE 7 in A new species of Trachytherus (Notoungulata: Mesotheriidae) from the late Oligocene (Deseadan) of Southern Peru and the middle latitude diversification of early diverging mesotheriids

FIGURE 7. Phylogeny and historical biogeography of the Mesotheriidae. Cladograms of A and B were based upon the phylogenetic analysis in this study for the early diverging, non-mesotheriine mesotheriids (without the Deltran optimization given fig. 6) combined with the analysis of Croft et al. (2004) for the Mesotheriinae (see also Flynn et al. 2003). That of A includes the "published mesotheriid" (PM) dataset only, whereas B, the "undescribed plus published mesotheriids (U+PM), includes undescribed Tinguirirican material. Question marks indicate the uncertainties of affinities of the Tinguirirican taxa and that of an indeterminate mesotheriine Colhuehuapian (see text). Lines from taxon to map of South America are to indicate the general region(s) from which the taxa are known. The reconstructions of ancestral area presented here are based on the single character coding strategy (see Material and Methods). The bold lines of the cladogram indicate the evolution of the BOR distribution on the tree, whereas thin stems indicate distribution in SSA (see text for comments).