Scrutinizing Trilobite Evolution (IMAGE)

University of Chicago

Scrutinizing Trilobite Evolution

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.

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Photo by Dan Dry

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