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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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In this photo of a shallow coral reef in the Pacific there are three species of forams. Their colors come from the symbiotic algae that live inside the foram shells.
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Shallow Coral Reef Foraminifers

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Pink crustose algae covers the surface of a rock.
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Encrusting Pink Algae and a Seastar

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A couple inches wide and up to ten feet long, the bobbit worm stays hidden under tropical sands with just its five antennae poking out—waiting for prey to swim by.
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The Bobbit Worm

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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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In the X-ray image of this Viper Moray Eel (Enchelynassa canina), note the second set of jaws in the “throat”; these are the gill arches, which are present in all fish.
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X-Ray Image of a Viper Moray Eel

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a man snorkels above a reef while a woman in flippers sits on a boat
Timeline

Sunscreen in the Environment

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Tres peces grises nadan frente a una gran cabeza de coral.
Article

Cabo Pulmo – esperanza para los arrecifes de coral

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Two coral trout swim on a reef in Fiji.
Article

Having Your Fish and Eating Them Too

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a woman with short black hair and a long necklace of pearls sits in front of a microscope and holds a small button coral
Article

Joan Murrell Owens and her Button Corals

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A piece of the Hyperbolic Crochet Coral Reef exhibit.
Article

When Art Meets Science: The Hyberbolic Crochet Coral Reef

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Intense volcanic CO2 vents in Ili Ili Bua Bua, Normanby Island, Papua New Guinea.
Slideshow

Will Coral Reefs Survive Acidification?

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