Praya dubia, commonly known as the giant siphonophore, is a colonial organism found in the deep sea. It is composed of specialized zooids that function together as a single entity. Notable for its extreme length, it can reach over 40 meters, making it one of the longest animals in the world. Praya dubia inhabits deep ocean waters, often at depths exceeding 700 meters, where it uses bioluminescence to attract prey.

Praya dubia, also known as the giant siphonophore, is native to the deep ocean waters of the Atlantic Ocean. It is often found in regions such as the North Atlantic, but its exact range is not fully documented due to the challenges of deep-sea research.

Praya dubia resides in the deep sea, typically at depths ranging from 700 to 1000 meters (2300 to 3300 feet). The environment is characterized by cold temperatures, high pressure, and complete darkness. These conditions require specialized adaptations for survival.

As a siphonophore, Praya dubia is a colonial organism composed of specialized individual animals (zooids), each fulfilling different functions such as feeding, locomotion, and reproduction. It is a predator, feeding on small fish and plankton, capturing prey using its tentacles equipped with stinging cells. Its ecological role is as a mid-level predator in the deep-sea food chain.