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Model of a lion’s mane jellyfish on display at the Smithsonian National Museum of Natural History. This jellyfish, a member of the phylum Cnidaria, can have tentacles up to 190 feet long (58 meters) and a bell almost 7 feet (2 meters) in diameter.
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Lion's Mane Jellyfish in Sant Ocean Hall

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This is a series of images showing how a typical nightly courtship display would look like, where certain males initiate the display (2), others follow (3), and different species display their own unique “light shows” nearby (4 and 5).
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A typical nightly courtship display for P. annecohenae

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When seen from below a white belly better blends in with light-filled surface waters while from above a black back looks similar to the dark hues of the deep ocean.
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Galapagos Penguin from Above

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King Manuel of Portugal rides a sea creature
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Political Props

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Graduate students Danielle Young from Temple University and Dannise Ruiz from Penn State preparing oil and dispersant solutions for exposure experiments with deep sea corals aboard the exploration vessel E/V Nautilus.
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Testing Impacts of Dispersants

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A Hawaiian Lure
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Hawaiian Lure

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White growth emerges from a deep-sea coral sample stained pink to enable ocean scientists to measure its growth rate.
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Growth Experiment

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A rockfish finds refuge in a red tree coral, a deep-sea coral in the Olympic Coast National Marine Sanctuary.
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Rockfish Sheltering in Coral

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Unlike the shallow tropical coral reef at left, the deep-sea Oculina reef at right does not require sunlight.
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Shallow and Deep-Sea Coral Reefs

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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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Stephanocyathus (A.) spiniger, a solitary, deep-water stony coral species, has six long spines that slow it from sinking into soft substrates.
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Solitary Deep-water Corals

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A fisherman in Papua New Guinea shows his catch for a ceremonial feast. Communities there are successfully managing their local reefs by observing temporary fishing closures that end in time to celebrate the traditional feast.
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Celebratory Harvest in Papua New Guinea

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