Which family of caddisflies is referred to as free-living caddisflies?

The family of caddisflies known as free-living caddisflies is Rhyacophilidae. This designation arises from their unique lifestyle compared to other caddisfly families. Unlike many caddisflies that construct cases or retreats from various materials, the larvae of Rhyacophilidae do not build such protective structures and instead live freely within their environments, often found in streams and rivers. Their free-living nature allows them to be active hunters and predators, contributing to their ecological role in freshwater habitats.

The other families mentioned exhibit different behaviors; for instance, Philopotamidae are known for their net-spinning habits. Polycentropodidae also tends to build cases, as do numerous other caddisfly families, and Uenoidae includes species that typically construct silk retreats. This distinction in living styles illustrates the diverse adaptations within the caddisfly order, with Rhyacophilidae standing out due to their free-living lifestyle.