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Contact: Steve Koppes
skoppes@uchicago.edu
773-702-8366
University of Chicago
Caption: Mark Webster, assistant professor in geophysical sciences, examines a 500-million-year-old trilobite that was found in Nevada. In a study published in the July 26, 2007, issue of the journal Science, Webster presented data showing that trilobites exhibited much more within-species variation early in their history than later on.
Credit: Photo by Dan Dry
Usage Restrictions: This photo my be used to illustrate news reports about the findings describing in the accompanying announcement.
Related news release: Fossils older than dinosaurs reveal pattern of early animal evolution on Earth
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