"Genus Nanomia" is a specific term used to describe a genus of hydrozoan jellyfish that belongs to the order Siphonophorae. However, there are several synonyms that are sometimes used to describe this genus, including the following: Physophora elongata, Nanomia argentea, and Nanomia bijuga. These terms are used interchangeably in some scientific literature to refer to the same jellyfish species. Nonetheless, it's important to use the correct term when referring to specific organisms to avoid confusion or miscommunication in the scientific community. Regardless of the term used, all descriptions of this genus describe jellyfish that have long, slender tentacles and are a striking silver color.