Report

Impacts of the Cretaceous Terrestrial Revolution and KPg Extinction on Mammal Diversification

Science  22 Sep 2011:
pp.
DOI: 10.1126/science.1211028

Abstract

Previous analyses of relations, divergence times, and diversification patterns among extant mammalian families have relied on supertree methods and local molecular clocks. We constructed a molecular supermatrix for mammalian families and analyzed these data with likelihood-based methods and relaxed molecular clocks. Phylogenetic analyses resulted in a robust phylogeny with better resolution than phylogenies from supertree methods. Relaxed clock analyses support the long-fuse model of diversification and highlight the importance of including multiple fossil calibrations that are spread across the tree. Molecular timetrees and diversification analyses suggest important roles for the Cretaceous Terrestrial Revolution and Cretaceous-Paleogene mass extinction in opening up ecospace that promoted interordinal and intraordinal diversification, respectively. By contrast, diversification analyses provide no support for the Eocene delayed rise of present-day mammals hypothesis.

  • * First and last authorship determined by coin flip.

Cited By...