Telegraph,  UK - An 'immortal' jellyfish is swarming through the world's oceans,  according to scientists. The Turritopsis Nutricula is able to revert back to a  juvenile form once it mates after becoming sexually mature. 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."
 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 transdifferentiation.
Scientists believe the cycle can repeat indefinitely, rendering it potentially immortal.
 It does this through the cell development process of transdifferentiation.
Scientists believe the cycle can repeat indefinitely, rendering it potentially immortal.