immortal jellyfish (Turritopsis dohrnii) This species of tiny, translucent, jellyfish-like invertebrates is renowned for its ability to evade death by cycling repeatedly between its polyp and medusa forms. (more) immortal jellyfish hydrozoan Actions Share Share Share to social media Facebook X URL https://www.britannica.com/animal/immortal-jellyfish Share Share Share to social media Facebook X URL https://www.britannica.com/animal/immortal-jellyfish Also known as: Turritopsis dohrnii Written by Karen Sottosanti Karen Sottosanti is a writer and editor who works in educational publishing. Karen Sottosanti Fact-checked by The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors. The Editors of Encyclopaedia Britannica Last Updated: Oct 4, 2024 • Article History Table of Contents Ask the Chatbot a Question Ask the Chatbot a Question immortal jellyfish, (Turritopsis dohrnii), species of tiny, translucent, jellyfish-like invertebrate animals of the phylum Cnidaria, which is renowned for its ability to evade death by cycling repeatedly between its polyp and medusa forms. The immortal jellyfish is not a true jellyfish, however, as it does not belong to class Scyphozoa. It is a hydrozoan (class Hydrozoa). Although the immortal jellyfish is native to the Mediterranean Sea, it was introduced to marine habitats worldwide during the early 21st century, likely through the ballast water of ocean-going ships. The immortal jellyfish is one of the smallest Cnidarians, and it is often compared ...(100 of 877 words)

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