Technical Comments

Technical Comment on “The Placental Mammal Ancestor and the Post–K-Pg Radiation of Placentals”

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Science  09 Aug 2013:
Vol. 341, Issue 6146, pp. 613
DOI: 10.1126/science.1238025


O’Leary et al. (Research Article, 8 February 2013, p. 662) examined mammalian relationships and divergence times and concluded that a single placental ancestor crossed the Cretaceous-Paleogene (K-Pg) boundary. This conclusion relies on phylogenetic analyses that fail to discriminate between homology and homoplasy and further implies virus-like rates of nucleotide substitution in early Paleocene placentals.

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