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Syllid fireworms can be found mainly on the seafloor, but they switch to a planktonic form to reproduce, where the females use bioluminescent signals.
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Syllid Fireworms

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This close-up view of salps, which have aggregated together into a long chain, have brilliant red guts from eating red plankton.
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Close-up View of Salps

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Smithsonian Zoologist Dr. Clyde Roper in front of the museum's stored cephalopod collection.
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Smithsonian Cephalopod Collection

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This species of bamboo coral, discovered in 2004 in the Pacific Northwest, has unusually long and impressive tentacles.
Slideshow

Newly Discovered Deep-Sea Corals

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a small spikey crab sits on a black background
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Tiny Crab Gains a Big Audience

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

Marine Parasites: Crazy…and Really Cool!

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Small orange brittlestars on the coast of the Atlantic.
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An Invasive Brittlestar

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A blue shark, with a copepod attached to its dorsal fin, coasts through waters near New England.
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Blue Shark

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Hermit crabs, like this one collected in Moorea, usually protect their soft, vulnerable abdomens from predators by reusing empty snail shells. This specimen shows the crab without its customary borrowed shelter.
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Hermit Crab Without a Shell

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Japanese scientists videotaped this female giant squid, alive, at the water's surface
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Giant Squid

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Two of the worlds largest jellyfish, the lions mane jellyfish, float together.
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Extreme Jellyfish

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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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