36+ Immortal Jellyfish Polyp Stage Background. Turritopsis nutricula is potentially immortal, it is a hydrozoan whose medusa, or jellyfish, form can revert back to the polyp stage after becoming sexually mature. Jellyfish can exist in polyp form, as medusa, or can alternate between both.

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The supposedly 'immortal' jellyfish turritopsis dohrnii has captivated scientists since it was discovered decades ago. Like other jellyfish, it goes through two main stages of life, polyp and medusa. Scientists have discovered that a hydrozoan named turritopsis nutricula is biologically immortal.

Stages of jellyfish metamorphosis seen using an electron microscope, featured on the cover of current biology.

You can see the polyp on the bottom right, the strobila and the immature jellyfish at the top. Like other jellyfish, it goes through two main stages of life, polyp and medusa. The immortal jellyfish is capable of returning to its polyp stage at any stage as a medusa. Turritopsis nutricula, the potentially immortal jellyfish, is a hydrozoan whose medusa, or jellyfish, form can revert to the polyp stage after becoming sexually mature.