Praya dubia

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Praya dubia, the giant siphonophore, lives in the mesopelagic zone to bathypelagic zone at 700 m (2,300 ft) to 1,000 m (3,300 ft) below sea level. It has been found off the coasts around the world, from Iceland in the North Atlantic to Chile in the South Pacific. Praya dubia is a member of the order Siphonophorae within the class Hydrozoa. With a body length of up to 50 m (160 ft), it is the second-longest sea organism after the bootlace worm or the longest sea organism surpassing the bootlace worm if the longest specimens of the bootlace worm were just stretched beyond their usual length or nonexistent/mistaken. Its length also rivals the blue whale, the sea's largest mammal, although Praya dubia is as thin as a broomstick. Siphonophores are not single, multi-cellular organisms, but compound animals; colonies of tiny biological components called zooids, each having evolved with a specific function. Zooids cannot survive on their own, relying on symbiosis in order for a complete Praya dubia specimen to survive.