Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos

The Mekong River is a hotspot area for freshwater biodiversity, but caddisfly diversity is largely understudied. Three new species of caddisflies from three different families are described and illustrated from Khon Phapheng Waterfall, the Mekong River, Laos; Orthotrichiachoengthongi Malicky & Laudee, sp. nov. (Hydroptilidae), Pseudoneureclipsiskhonphaphengensis Malicky & Thamsenanupap, sp. nov. (Polycentropodidae), and Setodeskarrilai Malicky & Laudee, sp. nov.Orthotrichiachoengthongi Malicky & Laudee, sp. nov. can be differentiated from the most similar OrthotrichiatritonMalicky 2008 by the specific shape of segment X which is long and tubular, pointed apically and curved inward then immediately upward in dorsal view. Pseudoneureclipsiskhonphaphengensis Malicky & Thamsenanupap, sp. nov. differs from the similar P.kaineus Malicky & Bunlue in Malicky et al. 2004 by the shape of the inferior appendages that are usually broad, almost circular in lateral view. Setodeskarrilai Malicky & Laudee, sp. nov. is mainly different to S.omphale Malicky & Changthong in Malicky et al. 2004 by the distal part of segment X which has a brush-like process.