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June 28, 2005; 102 (26)
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Cover image: Populations of jellyfish, Mastigias sp., landlocked in tropical marine lakes, show extreme genetic isolation, founder effects, rapid morphological evolution, and behavioral adaptation. These results demonstrate incipient speciation in what may be modern analogues of Plio-Pleistocene populations isolated in ocean basins by glacially lowered sea level. See the article by Dawson and Hamner on pages 9235–9240. Photographs by Michael N Dawson and Larry Sharron (Top Right) courtesy of Coral Reef Research Foundation.

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June 28, 2005; 102 (26)
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