Immortal Jellyfish

A startling exception to the great biological rule. /

Creation offers many analogies to theology, and one of the more unexpected is this: God is said to be eternal, with neither beginning nor end. Creation, on the other hand, has a beginning, and all creatures therein have an end. But one creature seems to mimic God’s immortality. As with all analogies, it isn’t perfect; still it harkens to deeper truths. —The Editors

Earth’s oceans are so vast and diverse that something in the ocean will prove an exception to almost every biological rule, like everything that lives must eventually die. Enter the exception: Turritopsis nutricula, the immortal jellyfish.

Turritopsis are tiny translucent jellies, just a quarter of an inch across at the base of their bell-shaped bodies, wrapped in sinuous tentacles that sting prey and deliver food. The jellies’ lives are pretty boring: eat, reproduce, repeat. Life is brutal for small ocean invertebrates, and predation or environmental stress quickly claims them. Turritopsis are dubbed immortal not because they don’t die, but because they needn’t. They possess the ability—unique among the more familiar animals on the planet—to age in reverse.

Turritopsis start life as a collection of anemone-like polyps that grow across the seabed, multiplying into a lace-like colony with tiny towers of tentacles extending out to catch passing food. The polyps also produce buds that break away and become a medusa, a swimming jellyfish. In turn, the jellies develop gonads to create the next generation of polyps, and then die. All of which is perfectly normal for this kind of jelly.

Turritopsis throws this cycle into reverse. Following injury or the introduction of a new environmental stressor, a swimming Turritopsis ...

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Also in this Issue

Issue 4 / September 4, 2014
  1. Editors’ Note
  2. What Steadfast Looks Like in a Revolution

    How in three years an evangelical pastor went from America’s first national hero to “the first of villains.” /

  3. Making Someone Who Lasts

    My enduring legacy is sleeping in the nursery. /

  4. The Gospel of a Splendid God

    The good news is better than we imagine. /

  5. Wonder on the Web

    Links to amazing stuff

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