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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

 A live coral polyp with turquoise tissue and brown tentacles closes its mouth (the...
A purple jellyfish
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Stinging Beauty

 Don't let this jellyfish's beauty fool you—even glancing one of...
A close-up photo of dead man's fingers (Alcyonium digitatum), living in the Baltic Sea.
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Dead Man’s Fingers

 Dead man’s fingers (Alcyonium digitatum) are soft corals named for their...
 Scientist Martha Nizinski holds a specimen of a fan sponge (Phakellia sp.) collected at a deep-sea coral study site off the coast of South Carolina.    
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Fan Sponge

 Dr. Martha Nizinski holds a specimen of a fan sponge (Phakellia sp.) collected at a...
A translucent arctic comb jelly.
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Arctic Comb Jelly

 The Arctic comb jelly or sea nut (Mertensia ovum) is commonly found in the surface...