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Rewrite this "Immortal jellyfish" redirects here. For other species identified by the same term, see Biological immortality § Jellyfish and comb jellies. Turritopsis dohrnii, also known as the immortal jellyfish, is a species of small, biologically immortal jellyfish[2][3] found worldwide in temperate to tropic waters. It is one of the few known cases of animals capable of completely reverting to a sexually immature, colonial stage after having reached sexual maturity as a solitary individual. Like most other hydrozoans, T. dohrnii begin their lives as tiny, free-swimming larvae known as planulae. As a planula settles down, it gives rise to a colony of polyps that are attached to the sea floor. All the polyps and jellyfish arising from a single planula are genetically identical clones.[4] The polyps form into an extensively branched form, which is not commonly seen in most jellyfish. Jellyfish, also known as medusae, then bud off these polyps and continue their life in a free-swimming form, eventually becoming sexually mature. When sexually mature, they are known to prey on other jellyfish species at a rapid pace. If the T. dohrnii jellyfish is exposed to environmental stress, physical assault, or is sick or old, it can revert to the polyp stage, forming a new polyp colony.[5] It does this through the cell development process of transdifferentiation, which alters the differentiated state of the cells and transforms them into new types of cells. Need Assignment Help?