Coleoptera hydrophilidae, commonly known as water scavenger beetles, are aquatic insects found in freshwater habitats. They are distinguished by their streamlined bodies, long legs adapted for swimming, and clubbed antennae. These beetles play a critical role in aquatic ecosystems by feeding on decaying organic matter and algae.

The family Hydrophilidae, commonly known as water scavenger beetles, is widely distributed across various continents including North America, South America, Europe, Asia, Africa, and Australia. They are found in a broad range of geographical areas, from temperate to tropical regions.

Water scavenger beetles typically inhabit freshwater environments such as ponds, marshes, streams, and wetlands. They are often found in areas with abundant aquatic vegetation, which provides both food and shelter. These beetles can also be found in brackish waters and occasionally in damp terrestrial environments.

Hydrophilidae beetles play an important role in aquatic ecosystems as scavengers. They feed on decaying organic matter, algae, and sometimes small invertebrates, helping to recycle nutrients in their environment. Their larvae are also aquatic and contribute to the breakdown of organic material. Adaptations such as their ability to store air under their wing covers allow them to stay submerged for extended periods while foraging.