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Turritopsis dohrnii
Image courtesy of Shin Kubota, Seto Marine Biological Laboratory, Japan
Turritopsis dohrnii
Taxonomic Group: Cnidarians-Hydrozoans


The immortal jellyfish (Turritopsis dohrnii) has both a polyp and medusa stage, and can switch between the two stages. This ability to go from medusa to polyp means an individual can live a very long life! It was first described from Naples, Italy, and is a common hydroid on rocky substrates in the Western Mediterranean and Adriatic where its distribution is considered cryptogenic. Introduced populations are known from the Indian River Lagoon, Florida; both the Caribbean and Pacific coasts of Panama; and Japan. The hydroid stage of this species can be found attached to rocks, docks, pilings and ships’ hulls. No impacts have been reported from introduced populations.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
Smithsonian Environmental Research Center

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