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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

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Squid expert Dr. Clyde Roper examines specimens stored in jars in the Smithsonian collection.
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Dr. Clyde Roper

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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.
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Coralline Algae Under the Microscope

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Despite its demonic look, the vampire squid collects and eats drifting particles called "marine snow" using two long, sticky filaments.
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The Vampire Squid from Hell

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A hawksbill sea turtle with a transmitter on its back.
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Satellite-Tagged Hawksbill Sea Turtle

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In 2005, scientists from the Monterey Bay Aquarium Research Institute (MBARI) observed a deep-sea squid species (Gonatus onyx) that keeps close watch over her eggs.
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Squid Watching Over Eggs

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a thick multicolored oil sheen on the water inside a boat marina
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Oil on the Water

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Arrow crabs are small, spider-like crabs that live on coral reefs.(CLICK IMAGE TO OPEN SLIDESHOW WITH MORE WINNING PHOTOS FROM THE CONTEST)
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Spiders from Mars

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Traditional Native festivities often included ceremonial objects like this bowl.
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Feasting Bowl

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A white scar on Phoenix’s lip (at right) was caused by her entanglement with a fishing line.
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Lip Scar Caused By Fishing Gear

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Photograph of a bristly brown and white worm, with one end pressed against a pale green coral.
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Fireworm Takes on Fire Coral

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This radio device is used to track North Atlantic right whales. Suction cups hold the device to a whale's back, where it records data such as depth, water, temperature, and underwater sounds.
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Whale Tracking Device

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