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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 several large jellyfish with orange bells, dark red tentacles, and pale ruffly oral arms, swimming against a bright blue aquarium background.
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Pacific Sea Nettles

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A PIV image of a moon jelly and its wake.
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PIV Image of Moon Jelly

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A large, white jellyfish floats through murky water
Article

Ghosts of the Ocean: Explaining Marine Life Devoid of Color

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Jellies in the Class Hydrozoa are transparent and easily overlooked.
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Transparent sea jelly

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A screenshot from the video showing a translucent jellyfish in deepwater.
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Blackwater Drifting

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Chuniphyes are siphonophores—colonial organisms in the same phylum as jellyfish, working together to survive.
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Ultimate Teamwork

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an upside down jellyfish
Article

Tracking Down Ocean Species On the Go Using eDNA

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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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The siphonophores are an order of marine animals in the phylum Cnidaria (the same phylum containing jellyfish). 
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Siphonophores

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