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Helmet Jelly
Periphylla periphylla
The Helmet Jelly can be found at all depths of the ocean. This vibrant and strange jellyfish tends to proliferate in Norwegian fjords. They are one of the dominant predators in these isolated ecosystems.
Photos
http://www.seawater.no/fauna/cnidaria/periphylla.html
https://www.bigfishexpeditions.com/2019/01/24/norway-deepwater-shark-diving-2018/helmet-jelly/