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Phyllorhiza punctata
''Phyllorhiza punctata'' is a species of jellyfish, also known as the floating bell, Australian spotted jellyfish or the white-spotted jellyfish. It is native to the West Pacific from Australia to Japan, but has been introduced widely elsewhere. It feeds primarily on zooplankton. ''P. punctata'' generally can reach up to in bell diameter,〔Bishop Museum (2002). ''(Phyllorhiza punctata. )'' Hawaii Biological Survey, Bishop Museum. Retrieved 6 July 2015.〕〔 but in October 2007, one wide, perhaps the largest ever recorded, was found on Sunset Beach, North Carolina.
==Description==
True jellyfish go through a two-stage life cycle which consists of a medusa stage (adult) and a polyp stage (juvenile). In the medusa stage male jellyfish release sperm into the water column and the female jellyfish gathers the sperm into her mouth where she holds the eggs. Once fertilization occurs and larvae are formed they leave their mother and settle to the ocean floor. Once on the bottom a polyp form occurs and this form reproduces asexually by “cloning” or dividing itself into other polyps. Jellyfish can live for up to five years in the polyp stage and up to two years in the medusa stage(active).
When found in warm waters these jellyfish flourish. They are mostly euryhaline but low salinities may have a negative effect on the species. In times of low salinity these jellyfish exhibit loss of their zooxanthellae.
They have only a mild venom and are not considered a threat to humans. They have a mild or non-noticeable sting which can be cured with vinegar. Salt water can be used as a last resort.
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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