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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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Photograph of a transparent polka-dotted squid in the dark ocean.
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Cockatoo Squid

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Dr. Clyde Roper (rear) and museum specialist Mike Sweeny examine a giant squid specimen.
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Studying Giant Squid

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A tusk shell hermit crab peeks out of his shell.
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Tusk Shell Hermit Crab

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Colorful scaleworm on a seastar
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Pops of Polychaete Color

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White abalone
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White Abalone In Danger

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A photo of zebra mussels clinging together, the mollusks have successfully invaded brackish and freshwater areas across North America.
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Zebra Mussels (Dreissena polymorpha)

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A veined octopus sits inside a vacant bivalve shell, which it uses as a portable shelter, in the Philippines. This is one of the few examples—if not the only example—of tool use in invertebrates.
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Veined Octopus at Anilao Batangas Pier, Philippines

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This male giant squid is on display at the Smithsonian’s National Museum of Natural History.
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Male Giant Squid

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Hundreds of illustrated red crabs gathering on sand with Santa hats.
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Here Comes Santa Claws

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Small foram shells in seafloor sediment.
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Little Critters that tell a BIG Story: Benthic Foraminifera and the Gulf Oil Spill

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A clear tomoptorid with many leg-like parapodia photographed on a black background.
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Tech Imitates Life: Sneaky Sea Worm Inspires Soft Robots

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