1) Siphonophore 
[genus] Praya is a genus of marine invertebrates in the order Siphonophora. They are colonial, but the colonies can superficially resemble jellyfish; although they appear to be a single organism, each specimen is actually a colony of Siphonophora. It contains the following species: ...
[n] - colonial siphonophore of up to 130 ft long
noun colonial siphonophore of up to 130 ft long