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Craspedacusta sowerbyi is a freshwater jellyfish in the phylum Cnidaria. Since it is classified as a hydrozoan, it is one of many jellyfish that are also known as hydromedusae ("medusa" is another word for jellyfish). Hydromedusan jellyfish differ from scyphozoan jellyfish because they have a muscular, shelf-like structure called a velum on the ventral surface, attached to the bell margin. C. sowerbyi is found throughout the world in bodies of fresh water.