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Archive - Feb 13, 2009

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Ocean Mysteries: 'Immortal' jellyfish from Caribbean capable of reverting to younger self spreading all over world

an 'immortal' jellyfish is swarming through the world's oceans, according to scientists

(quote)

Marine biologists say the jellyfish numbers are rocketing because they need not die. Dr Maria Miglietta of the Smithsonian Tropical Marine Institute said: "We are looking at a worldwide silent invasion."

The jellyfish are originally from the Caribbean but have spread all over the world. Found in warm tropical waters Turritopsis is believed to be spreading across the world as ships’ ballast water is discharged in ports.

a Turritopsis polyp: the jellyfish reverts to this sexually immature stage when starved or damaged

Turritopsis Nutricula is technically known as a hydrozoan and is the only known animal that is capable of reverting completely to its younger self. It does this through the cell development process of transdiff- erentiation. Scientists believe the cycle can repeat indefinitely, rendering it potentially immortal.

Though solitary, they are predatory creatures and evolve asexually from a polyp stage. While most members of the jellyfish family usually die after propagating, the Turritopsis nutricula has developed the unique ability to return to a polyp state. read more »

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