Two new Jurassic fossils yield conflicting reconstructions of the mammalian tree. These divergent genealogies have profoundly different implications for the origin and early diversification of mammals. See Article p.163 & Letter p.199
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Cifelli, R., Davis, B. Jurassic fossils and mammalian antiquity. Nature 500, 160–161 (2013). https://doi.org/10.1038/500160a
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DOI: https://doi.org/10.1038/500160a
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