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. It is actually a colony made up of numerous small connected individuals, each with a specific function, such as feeding, attack and defense. It is distributed through Atlantic Europe and the Gulf of Mexico.