Hydromyinae is a subfamily of rodents that belong to the family of Muridae. This subfamily includes a number of species that are commonly referred to as "water rats" or "swamp rats." There are also a variety of synonyms that are used to refer to this particular group of rodents. Some of the more commonly used synonyms for Hydromyinae include "marsh rats," "water mice," and "stream rats." Other less common synonyms include "river rats," "water voles," and "aquatic rats." Regardless of the specific term used to describe these creatures, they are all known for their affinity for living near bodies of water and utilizing aquatic habitats for survival.