Fossil Record Reveals Tropics as Cradle and Museum

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Science  06 Oct 2006:
Vol. 314, Issue 5796, pp. 66-67
DOI: 10.1126/science.1133351

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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.