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This common octopus (Octopus vulgaris) shows off its siphon, which it uses to propel itself through the water.
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Octopus Shows Off Its Funnel

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Light refracts off the comb-rows of this ctenophore.
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Comb Jelly Reflecting Colors

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Photograph of a translucent red-orange comb jelly against a black sea.
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Red Mid-Water Comb Jelly

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A fringe of tentacles surrounds the bell of this jellyfish (Halicreas minimum).
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Midwater Jellyfish

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These wormlike animals make spiral tracks on the sea floor.
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Deep-Sea Worms

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On a seamount peak, a huge colony of brittle stars (likely Ophiacantha rosea) feeds on passing particles.
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Millions of Brittle Stars

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A nudibranch showing a closeup of their fleshy, tentacle-like growths, called cerata.
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Aeolid Nudibranch Defense

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A crown-of-thorns starfish in the Marianas Islands.
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Mystery Photo: Prickly Puzzler on the Reef

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Giant squid have eight arms but use their two long feeding tentacles to seize prey.
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Giant Squid Anatomy

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A deep red jellyfish, Crossota norvegica, floats in the water.
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Deep-Red Jellyfish

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A translucent, female hyperiid surrounded by white young in a barrel-shaped body cavity.
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Phronima Female and Young

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Two small, translucent hyperiids with very large eyes.
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Paraphromina

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