FREE FLOAT The clear bell of a gelatinous hydrozoan is a floating home for a jelly - rider called a hyperiid amphipod. (sciencenews.org)
Hydromedusae are a subclass within the class hydrozoan from the phylum Cnidaria — which also includes jellyfish, sea anemones and corals. (oceanacidification.de)
«The discovery of green fluorescent protein in a hydrozoan jellyfish in the 1960s has provided a revolutionary tool for modern biologists, transforming our study of everything from the AIDS virus to the workings of the brain,» Gruber said. (sciencedaily.com)