It's called a "flying tube beetle" or more often a "flying lampshade". Think of it like a living tube kite that makes its own tether and catches what food it can while it floats in the wind. I don't know how big it's supposed to be. How could something like this evolve? Is this too far fetched?
Giant Pyrosomes are actually a real sea creature that is very similar to what you are describing, except it lives in the ocean and is a colony of organisms in stead of a single organism. It could get the information you are looking for.