Praya dubia, or the giant siphonophore, is a deep sea siphonophore (living at 700 m to 1000 m below sea level), a member of the Hydrozoa. With a body length of 40 m (130 ft), Praya dubia is the second-longest sea organism. The giant siphonophore is not a single multicellular organism, but a colony of tiny minute organisms called zooids, each with a specific function, such as feeding, attack and defense. The zooids are all joined to each other to the extent that they are incapable of independent survival. It is distributed through Atlantic Europe and the Gulf of Mexico.