Hyalella is a genus of small, freshwater amphipods commonly found in various aquatic environments, including streams, lakes, and wetlands. These tiny crustaceans typically measure between 5 to 10 millimeters in length and play a crucial role in the ecosystem by serving as a food source for fish and other wildlife. Hyalella species are known for their ability to thrive in diverse habitats, often living in sediment or among aquatic vegetation. They contribute to the breakdown of organic matter, helping to maintain water quality and nutrient cycling in their ecosystems.