This siphonophore, in the family Stephanomiidae, was seen at a depth of 1,531 meters (almost one mile) while exploring an unnamed seamount in the U.S. and Kiribati exclusive economic zones during 2017’s Discovering the Deep: Exploring Remote Pacific Marine Protected Areas. Siphonophores appear to be a single organism, but they are actually colonies of individual hydrozoans, each specialized for different functions such as swimming, feeding, and reproduction. See this beauty in action. Image courtesy of NOAA Ocean Exploration, Discovering the Deep: Exploring Remote Pacific MPAs 2017.
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