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Key Facts about Giant Phantom Jellyfish

Feb. 9, 2026

Scientists on a month-long deep-sea expedition off Argentina’s coast documented a rare giant phantom jellyfish recently.

About Giant Phantom Jellyfish:

  • It is a rare and mysterious deep-sea jellyfish known for its ghostly, translucent appearance.
  • It is among the largest jellyfish.
  • Scientific Name: Stygiomedusa gigantea
  • It is in the Ulmaridae family.
  • It is believed to be widespread throughout the world’s oceans, except in the Arctic Ocean.
  • Unlike most jellyfish, it lacks tentacles. Instead, they use ribbon-like arms to grab prey, typically plankton or small fish, and pull them into their mouths. 

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