Origin & Evolution of Life: May 2013

The widespread disappearance of stromatolites, the earliest visible manifestation of life on Earth, may have been driven by single-celled organisms called foraminifera.

Untangling The Tree of Life on Earth

Two recent high-profile phylogenetic studies reached conflicting conclusions about whether snail's closest relatives are bivalves or an enigmatic group called tusk shells. Vanderbilt phylogeneticists suggest that the cause of this conflict is that the three groups diverged rapidly a long time ago. Credit: Antonis Rokas, Vanderbilt University