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Squid size comparison chart: Lycoteuthis springeri (10-12cm), Leachia atlantica (up to 12cm), Promachoteuthis sp. (up to 5cm), Batoteuthis scolops (up to 20cm).
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What is the Largest Squid? A Squid Size Comparison Chart

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Sea anemones, brittle stars, and sea urchins make a home on mangrove roots.
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Mangrove Roots Up Close

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At the Smithsonian Tropical Research Institute in Panama, Dr. Wayne Sousa (right) studies lightning impacts.
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Field Research in Panama

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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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This Marine National Monument protects a chain of atolls and reefs 1,931-kilometers (1,200-miles) long.
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Northwestern Hawaiian Islands Marine National Monument

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These bleached corals in the Gulf of Mexico are the result of increased water temperatures.
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Bleached Corals

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Dr. Stephen Cairns, a Smithsonian research zoologist, studies deep-water corals.
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Dr. Stephen Cairns

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A few corals are part of this small sampling of the approximately 35 million specimens represented in the invertebrate zoology collection housed at the National Museum of Natural History.
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Specimens from the Smithsonian Invertebrate Zoology Collection

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

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