Graptolite Colony (IMAGE)

University of Chicago

Graptolite Colony

Caption

A colony of Monograptus priodon, a neograptine graptolite species that arose after the Ordovician mass extinction. Neograptines, a form of zooplankton, did not rapidly evolve new physical traits until about 2 million years after the extinction event. The specimen measures approximately one millimeter (four hundreds of an inch) wide.

Credit

Charles Mitchell, University of Buffalo, SUNY

Usage Restrictions

News organizations may use this image in connection with reports about the research of Charles Mitchell and David Bapst.

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