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Photograph of a many-armed sea star with maroon and white feathery-looking arms, with a deep red sea fan in the background.
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Feather Star

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A tongue-like organ called the radula rams food down the giant squid's throat.
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Giant Squid Beak and Radula

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A mangrove tree crab clings to a leaf near a Smithsonian marine laboratory in Panama.
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Mangrove Tree Crab

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Hundreds of illustrated red crabs gathering on sand with Santa hats.
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Santa Claws is Coming to Town

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A pink sea cucumber covered in small spike-like protrusions.
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Sea Cucumber: One Species at a Time

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Turbinolia stephensoni
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Smallest Coral Species

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a black and white photo of a woman holding a glass award
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Dr. Marian Pettibone, A Woman of Firsts

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The staghorn coral is listed as Threatened under the U.S. Endangered Species Act. It is one of 22 coral species listed.
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Staghorn Coral

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Juvenile Clam with Tentacles
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Spaceship Mollusk

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Lacy Crust Bryozoans
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Lacy Crust Bryozoan

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Mantis shrimp have built-in polarized vision to help them see underwater—and maybe even communicate.
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Built-in Underwater Polarized Lenses?

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The toothy goby or common ghost goby (Pleurosicya mossambica) has a commensal relationship with soft corals and sponges in the Indo-Pacific ocean.
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Toothy Goby in Coral

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