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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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A transparent amphipod looks a bit like a lobster, surrounded by white eggs.
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Amphipod: Salp Invader

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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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Jellyfish are transparent and made up of 95 percent water, so you’d think there isn’t much to them. But you’d be wrong. Jellyfish are more complex than you’d think—and one of their most fascinating parts is their stinging cells.
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How Do Jellyfish Sting?

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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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Colorful Christmas tree worms
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A Forest of Christmas Tree Worms

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An image of a giant anemone with yellow-tipped white tentacles.
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Giant Anemone

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White muscle surrounds the dark brown beak of a giant squid.
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Giant Squid Beak

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Comb jellies (such as this Bolinopsis species) are named for their combs: the rows of cilia lining their bodies that propel them through the ocean.
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Ctenophore Combs - Close Up

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An Isopod Full of Fish Blood
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Isopod Engorged With Blood

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A close-up image of red coral polyps.
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Star of the Reef: One Species at a Time

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