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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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Corallimorpharian
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Soft Coral Close-Up

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A tiny yellow goby living inside an abandoned can on the seafloor; Suruga Bay, Japan
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Image Gallery: The Perfect Underwater Photo

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A cameraman navigates a smack of sea nettles (Chrysaora fuscescens) in Monterey Bay. Sea nettle blooms have become more common in recent years.
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Cameraman with Sea Nettles

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Juvenile Clam with Tentacles
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Spaceship Mollusk

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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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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 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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Two California market squids mate in the waters off of California's Channel Islands.
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California Market Squid

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A hermit crab looks out from its coral dwelling in the waters of Japan's Ogasawara Islands.
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Coral Hermit Crab

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A sea monster attacks a ship in an illustration for 20,000 Leagues Under the Sea by Jules Verne.
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Sea Monster Attack

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Lacy Crust Bryozoans
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Lacy Crust Bryozoan

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