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Placental mammalian tree and 3 phylogenetic hypotheses of major lineages. (A) Mammalian interordinal phylogeny previously analyzed by retroposon insertion analysis (6) with the time scale (53). The bold vertical line denotes the root of placental mammals that was addressed in this study. (B) Three phylogenetic hypotheses to root the eutherian tree: tree 1, Exafroplacentalia (Afrotheria basal); tree 2, Epitheria (Xenarthra basal); and tree 3, Atlantogenata (Boreotheria basal).
