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Helmet jellyfish
The helmet jellyfish (''Periphylla periphylla'') is a luminescent, red-colored jellyfish of the deep sea, belonging to the order Coronatae of the phylum Cnidaria.
== Reproductive cycle ==
''P. periphylla'' represents an exception, very rarely found in the phylum ''Cnidaria'': the medusae go through no polyp stage, thus presenting a "holopelagic" life cycle. The medusae strew fertilized eggs in open water and these develop directly into medusae, whose development rests entirely upon the egg's high yolk supply. The ephyra stage common among other jellyfish is not to be observed in ''P. periphylla''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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