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Many medicines were based on a chemical from the sea sponge Tectitethya crypta.
Article

Five Questions for Shirley Pomponi, Medical Sponge Hunter

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
Overview

Corals and Coral Reefs

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A woman standing in front of a barge
Article

Mary Rice: A Force of Nature

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a jelly-like nudibranch that is see through
Photo

Sea Slugs that Fly

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Bright colors seem to jump off of this comb jelly, or ctenophore.
Photo

Floating Antarctic Comb Jelly

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Crabs in the wild decorate with the things around them, like these anemones.
Photo

Do You Like My Hat?

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This orange boring sponge (Cliona varians) overgrows several coral species at Panama's Smithsonian Tropical Studies Institute.
Article

Ocean Acidification Excites Boring Sponges

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A tiny yellow goby living inside an abandoned can on the seafloor; Suruga Bay, Japan
Slideshow

Image Gallery: The Perfect Underwater Photo

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a neon purple jellyfish
Photo

Floating Jelly

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Comb jellies have fragile bodies and are difficult to capture.
Photo

Fragile Comb Jelly

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The whitish spots on this fish are individual parasitic trematode worms.
Photo

Parasitic Worms in a Fish

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A zoomed-in image of the crown-of-thorns sea star.
Photo

Acanthaster planci

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