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Photograph of an orange many-armed sea star on an erect delicately-branched coral in a dark sea.
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Sea Star on Coral at Seamount

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Rudist clams are mollusks that went extinct about 65 million years ago.
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Rudist Clams

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
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Coral Reef on Gangga Island, Indonesia

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These corals are dead—smothered in sediments and overgrown with algae.
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Dead Coral Overgrown with Algae

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
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Close-up of a Coral Polyp

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Shallow water coral reefs straddle the equator worldwide.
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Global Distribution of Shallow Coral Reef Ecosystems

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Colorful corals and brittlestars on Manning Seamount off the New England coast.
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Manning Seamount Deep Coral Communities

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A white coral (Corallium sp.) and two vase sponges (left) grow on an Atlantic Ocean seamount.
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Balanus Seamount

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A variety of corals cling to Manning Seamount, just off the coast of Cape Cod, Massachusetts.
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Manning Seamount Deep Coral Community

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Compare the healthy coral on the left with the bleached coral on the right.
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Bleached Corals, Pacific Ocean

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What is coral? The answer is coral is an animal. This cutaway diagram of a coral polyp shows the location of its photosynthetic algae, or zooxanthellae, which coral needs to survive.
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What Is Coral? A Coral Polyp and Zooxanthellae

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
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Making Science Sing: The Longest Time (Coral Triangle Edition)

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