Recently transformed medusa stage of a freshwater jellyfish (IMAGE)
Caption
Likely native to the Yangtze River basin in China, C. sowerbii was first described outside its native range in 1880 in a London ornamental pond. Since then, it has spread globally, potentially through the transport of its tiny, resilient polyp and podocyst life stages, attached to aquatic plants, birds, or submerged substrates. In Europe, its presence is now established in regions ranging from Spain and Italy to Finland and Russia.
Credit
Photo: Álmos Becz
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CC BY-NC-ND