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This tentacle belongs to a blue button. While it has a central “float” with streaming tentacles like typical jellyfish, the blue button is a colony of many small hydroid animals.
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Blue Button Tentacle

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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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A close-up of tiny teeth on the common whelk's radula.
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A Snail's Rainbow Radula

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Colorful scaleworm on a seastar
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Pops of Polychaete Color

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A piece of the Hyperbolic Crochet Coral Reef exhibit.
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When Art Meets Science: The Hyberbolic Crochet Coral Reef

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Tiny sponge spicules.
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Sparkling Sponge Spicules

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A live coral polyp with turquoise tissue and brown tentacles closes its mouth (the slit at the center of the radiating ribs) tight.
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Closed-Mouth 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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Illustration of colorful nudibranchs from Ernst Haeckel.
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Art Forms in Nature: Marine Species From Ernst Haeckel

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A coral has just spawned. Each of the hundreds of polyps releases a small pink bundle of sperm and eggs.
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A Tale of Sex and Stress in the Ocean

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