This potentially new species of dandelion siphonophore, from the family Rhodalidae, was imaged using its tentacles to attach to iron-manganese encrusted rocks on the deep slopes of Rose Atoll. Seen during the 2017 American Samoa: Suesuega o le Moana o Amerika Samoa expedition.
Dandelion siphonophores are actually composed of many individuals that all work together, with some protecting the colony, some catching food, some reproducing, etc.
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Video courtesy of NOAA Ocean Exploration, 2017 American Samoa.