This description explores the fascinating world of jellyfish in the deep sea. It examines the unique adaptations of these creatures, their behavior, and their interactions with other sea life. It also looks at the various species of jellyfish that inhabit the depths of the ocean and the threats they face from human
From Wikipedia
The helmet jellyfish, sometimes called the merchant-cap, is a luminescent, red-colored jellyfish of the deep sea, belonging to the order Coronatae of the phylum Cnidaria. It is the only species in the monotypic genus Periphylla and a rare example of a scyphozoan with a polyp-less life cycle, occurring exclusively as a medusa. Periphylla is intensely photophobic, and thus only seldom leaves the bathypelagic zone.