Caseless-larva
Guides
Rhyacophila
caseless caddisflies
Rhyacophila is a large genus of caddisflies (Trichoptera) in the family Rhyacophilidae, comprising at least 640 described species. The genus is cosmopolitan in distribution, with significant diversity in Europe, Asia, and North America. Larvae are commonly known as 'caseless caddis' because they do not construct portable cases, instead using silk to anchor themselves to substrates in running water. The genus exhibits high endemism in certain regions, with multiple species restricted to specific mountain ranges or islands.