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May 31, 2021: Box Jelly
This box jelly, with its four characteristic tentacles, was seen pulsating along in the water column during exploration of an unnamed seamount located east of Bank 9 as part of the 2016 Hohonu Moana: Exploring Deep Waters off Hawaiʻi expedition.
Credit

Image courtesy of NOAA Office of Ocean Exploration and Research, Hohonu Moana 2016.