They discovered a 150-foot giant siphonophore (Praya dubia) in a "doom spiral," which traps unsuspecting prey. Many ...

Not only is it not a jellyfish, it's not even an "it," but a "they." The Portuguese man-of-war is a siphonophore, an animal made up of a colony of organisms working together. The man-of-war ...

The siphonophore is known as Rhizophysa eysenhardtii. Siphonophores are fascinating marine organisms belonging to the phylum Cnidaria, which includes jellyfish, corals, and sea anemones.