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


  • 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.

author list (cited authors)

  • Springer, M. S., Meredith, R. W., Teeling, E. C., & Murphy, W. J.

complete list of authors

  • Springer, Mark S||Meredith, Robert W||Teeling, Emma C||Murphy, William J

publication date

  • January 1, 2013 11:11 AM