Sphaeridiinae

Sphaeridiinae is a subfamily of hydrophilid beetles, commonly known as hydrophilid water beetles or scavengers. These beetles are characterized by their relatively small size, often less than 5 millimeters in length, and their convex, globular bodies. The subfamily is widespread and can be found in diverse habitats worldwide, particularly in moist environments such as dung, decaying vegetation, and the muddy margins of aquatic bodies.

Adult sphaeridiine beetles are typically coprophagous or detritivorous, feeding on excrement, rotting organic matter, and algae. Their larvae are often predatory, feeding on small invertebrates like insect eggs and larvae, or other soft-bodied prey. The life cycle of many sphaeridiine species involves aquatic or semi-aquatic larval stages, followed by terrestrial adult stages.

The subfamily Sphaeridiinae contains numerous genera and species, with significant diversity in their specific ecological roles and microhabitat preferences. Their feeding habits contribute to nutrient cycling and decomposition processes in their respective environments. Classification within Sphaeridiinae is based on morphological features, particularly those of the antennae, mouthparts, and male genitalia.