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The Peninsula Valdes in Argentina was inscribed on the World Heritage List in 1999. The site is home to important breeding populations of the endangered southern right whale (Eubalaena australis), southern elephant seal (Mirounga leonina), and southern sea
slideshow

Marine World Heritage Photo Gallery

Marine World Heritage is a prestigious list of 43 marine ecosystems and...
Tue, 11/09/2010 - 11:54
Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
slideshow

Zooxanthellae and Coral Bleaching

Tiny plant-like organisms called zooxanthellae live in the tissues of many animals,...
Thu, 12/03/2009 - 12:14
Colorful fishes throng a reef in the Northwestern Hawaiian Islands.
slideshow

Bizarre and Beautiful Coral Reef Animals

From parrotfish that cover themselves in a blanket of their own mucus to tiny pygmy...
Fri, 12/04/2009 - 14:05
Small red hyperiid.
slideshow

The Hyper Eyes of Hyperiids: How Some Shrimp-Like Creatures See Light in the Deep Sea

Hyperiid amphipods are small crustaceans related to sand fleas and distantly...
Tue, 08/19/2014 - 10:47
Mangrove Salt Glands
Photo

How Mangroves Deal with Saltwater

Looking at a white mangrove (Avicennia marina) leaf cross-section under the...
Red Algae
Photo

Branching Red Algae

Under the microscope, you can peer inside the cells of this filamentous red algae....
A spiraled diatom with spines.
Photo

A Diatom Helix

This beautiful marine diatom Chaetoceros debilis was caught in the North Sea. Not...
Unlike the green, leafy algae we're used to seeing, coralline algae has a hard crust—which you can see here at the molecular level under a scanning electron microscope.
Photo

Coralline Algae Under the Microscope

Unlike the green, leafy algae we're used to seeing on the seafloor, coralline algae...
Broad-leaf seagrass (Posidonia australis) with algae epiphytes grows at Corner Inlet Marine National Park in Australia.
Photo

Seagrass with Epiphytes

Broad-leaf seagrass (Posidonia australis) with algae epiphytes grows at Corner...
Coral Sand
Photo

Coral Sand Under a Microscope

Coral sand is aptly named: it's sand made up of tiny bits of coral and other ocean...
Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions.
Photo

Kelp Pennant

"Fronds of giant kelp, buoyed by their gas-filled pneumatocysts, wave like pennants...
A close-up photo of Killer Algae, Caulerpa taxifolia, a seaweed that has proven to be a successful invasive species.
Photo

Killer Algae (Caulerpa taxifolia)

A strain of this green seaweed, native to the Indian and Pacific Oceans, escaped...

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