Dryopids

Dryopids, also known as riffle beetles, are a family of aquatic beetles belonging to the order Coleoptera. These insects are characterized by their flattened bodies and specialized appendages adapted for life in fast-flowing water. They are typically found in riffles and shallow areas of streams and rivers where the water is well-oxygenated and clean. Dryopids are an indicator species, meaning their presence signifies good water quality.

The larvae and adults of dryopids are both aquatic. Larvae are often found clinging to submerged rocks and wood, feeding on algae and biofilms. Adult dryopids are also herbivores, scraping algae and diatoms from submerged surfaces. Their flattened bodies and strong claws help them to withstand the strong currents of their habitats. Reproduction involves the laying of eggs, usually on submerged vegetation or substrates. The life cycle typically involves several larval instars before pupation and emergence of the adult beetle.

The family Dryopidae is found worldwide, with many species exhibiting restricted geographic distributions, often endemic to specific river systems. Their sensitivity to pollution makes them valuable in biomonitoring efforts to assess the health of freshwater ecosystems. Conservation of their pristine stream habitats is crucial for the survival of many dryopid species.