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This urchin (Echinocrepis rostrata) leaves tracks as it moves across the ocean floor.
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Deep-Sea Urchin

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This male dancing fiddler crab (Uca terpsichores) has built a sand “hood” at the entrance to his burrow, which he hopes will attract females to his humble abode—as if that big beautiful claw of his weren't enough!
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The Dancing Fiddler Crab Shows Off

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Two nautiluses in the open ocean off the coast of Palau.
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A Couple of Nautiluses

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Dr. Clyde Roper in a one-person submersible.
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One-Person Submersible

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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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Jellyfish produce mucus, especially when stressed, which can interact with oil and break it down. This moon jellyfish is sloughing off mucus that has mixed with droplets of oil.
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Moon Jellyfish With Oil & Mucus

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A sea monster attacks a ship in an illustration for 20,000 Leagues Under the Sea by Jules Verne.
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Sea Monster Attack

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Thumbnail of Merriam-Webster video on the plural of octopus.
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Octopi? The Plural of an Octopus

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The Okeanos crew comes across the tiny jellyfish (Aegina citrea) that devours the tissue of octocoral feeding polyps. 
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Jellies Prey on Octocoral

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dead coral from disease
Article

Sickness in the Sea: A Coral Plague Hits Florida

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Orangutan crabs are covered in thin reddish hairs, and are frequently found living in bubble coral.
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Orangutan Crabs from Komodo Island

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A deep-sea octopus protecting her eggs
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Vigilant Octomom

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