| Version | Summary | Created by | Modification | Content Size | Created at | Operation |
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| 1 | Camila Xu | -- | 1281 | 2022-10-27 01:49:38 |
The helmet jellyfish (Periphylla periphylla) 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. They are the only known scyphozoan to undergo sexual propagation that lacks a planula stage. Not only is their reproductive cycle unique, so are their living conditions. They are found in deeper parts of the ocean due to them being photophobic.