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Science 6 October 2006:
Vol. 314. no. 5796, pp. 66 - 67
DOI: 10.1126/science.1133351
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Perspectives

EVOLUTION:
Fossil Record Reveals Tropics as Cradle and Museum

Charles R. Marshall

Over the past 11 million years, most bivalves that originated in the tropics expanded their ranges out of the tropics, where they now dominate the living extratropical fauna.

The author is in the Departments of Organismic and Evolutionary Biology and Earth and Planetary Sciences, Harvard University, 26 Oxford Street Cambridge, MA 02138, USA. E-mail: cmarshal{at}oeb.harvard.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)