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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

 This purple urchin Paleopneustes cristatus is seldom seen by itself, and...
Hedbergella sliteri - this specific specimen is the "holotype" for this species. That means it is the reference point for what all members of the species should look like.
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Hedbergella sliteri

 Hedbergella sliteri - this specific specimen is the "holotype" for this species....
Dr. Valerie Paul, director of the Smithsonian Marine Station at Fort Pierce, Fla., examines tropical seaweeds on northwestern Guam’s coral reefs.
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Diving in Guam

 Dr. Valerie Paul is studying chemical defenses that may protect coral reefs from...
Dr. Stephen Cairns, a Smithsonian research zoologist, studies deep-water corals.
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Dr. Stephen Cairns

 Dr. Stephen Cairns is a research zoologist and chair of the Department of...
An underwater photo of coral recovering from a bleaching event.
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Resilient Coral

 Is it lights out for corals once they have experienced a bleaching event? Not...
Satellite view of the Gulf Coast oil spill off of Louisiana, April 29, 2010.
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Gulf Coast oil spill

 Satellite view of the Gulf Coast oil spill off of Louisiana, April 29, 2010. ...