Helmet jelly

The helmet jellyfish (Periphylla periphylla), 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 (likely only on particularly dark nights).

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