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Nature 409, 614-618 (1 February 2001) | doi:10.1038/35054550;
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Molecular phylogenetics and the origins of placental mammals
The precise hierarchy of ancient divergence events that led to the present assemblage of modern placental mammals has been an area of controversy among morphologists, palaeontologists and molecular evolutionists. Here we address the potential weaknesses of limited character and taxon sampling in a comprehensive molecular phylogenetic analysis of 64 species sampled across all extant orders of placental mammals.
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