Definition
A caseworm is the larval stage of certain insects, primarily caddisflies (Trichoptera), that construct protective cases around themselves. These cases are made from materials like pebbles, sand, twigs, or plant fragments, held together with silk. The larva lives inside the case, dragging it along as it moves. Think of it as a tiny snail, but instead of a shell, it has a custom-built home. π The case provides protection from predators and environmental stressors.