Genus Peneus is a term used to describe a genus of crustaceans that belong to the family of shrimp-like creatures called Palaemonidae. This group of animals is also commonly referred to as the river shrimp family due to their unique habitat preference. Some of the common synonyms for Genus Peneus include the genera Macrobrachium, Potimirim, Cryphiops, and Palaemonetes. These shrimp-like creatures are found in freshwater and marine environments and are an important part of the aquatic ecosystem. Their diversity is reflected in the numerous synonyms used to describe them, highlighting their importance and unique characteristics.