Publication Date: 30 August, 2013
Previous analyses of relations, divergence times, and diversification patterns among extant mammalian families have relied on supertree methods and local molecular clocks. The authors of this paper constructed a molecular supermatrix for mammalian families and analyzed these data with likelihood-based methods and relaxed molecular clocks. The authors conclude that diversification analyses provided no support for the hypothesis concerning the delayed rise of present-day mammals during the Eocene Period.
Robert W. Meredith et al. Science 28 October 2011:Vol. 334 no. 6055 pp. 521-524