Contact: Steve Koppes
University of Chicago
Caption: The University of Chicago's David Jablonski is presenting new evidence that most evolutionary lineages started in the tropics and expanded outward in a process driven by what he and his colleagues call "bridge species."
Credit: NASA Visible Earth
Usage Restrictions: News organizations may use this image in connection with reports about the research of David Jablonski and his associates.
Related news release: Bridge species drive tropical engine of biodiversity