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; Orthotrichia choengthongi Malicky & Laudee, sp. nov. (Hydroptilidae), Pseudoneureclipsis khonphaphengensis Malicky & Thamsenanupap, sp. nov. (Polycentropodidae), and Setodes karrilai Malicky & Laudee, sp. nov.Orthotrichia choengthongi Malicky & Laudee, sp. nov. can be differentiated from the most similar Orthotrichia tritonMalicky 2008 by the specific shape of segment X which is long and tubular, pointed apically and curved inward then immediately upward in dorsal view. Pseudoneureclipsis khonphaphengensis 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. Setodes karrilai 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.

中文翻译：

---

来自老挝湄公河 Khon Phapheng 瀑布的三个新种石蛾（毛翅目、Hydroptilidae、Polycentropodidae、Leptoceridae）

湄公河是淡水生物多样性的热点地区，但对石蛾多样性的研究却很少。来自老挝湄公河 Khon Phapheng 瀑布的三个不同科的三个新种的石蛾被描述和说明；Orthotrichia choengthongi Malicky & Laudee, sp. 十一月 (Hydroptilidae), Pseudoneureclipsis khonphaphengensis Malicky & Thamsenanupap, sp. 十一月 (Polycentropodidae) 和 Setodes karrilai Malicky & Laudee, sp。nov.Orthotrichia choengthongi Malicky & Laudee, sp. 十一月 可以通过 X 段的特定形状与最相似的 Orthotrichia tritonMalicky 2008 区分开来，该段 X 是长而管状的，顶端尖并向内弯曲，然后在背视图中立即向上。Pseudoneureclipsis khonphaphengensis Malicky & Thamsenanupap, sp. 十一月 与类似的P不同。kaineus Malicky & Bunlue 在 Malicky 等人。2004 年的下附肢的形状通常很宽，从侧面看几乎是圆形的。Setodes karrilai Malicky & Laudee, sp. 十一月 主要与 Malicky 等人的 S. omphhale Malicky & Changthong 不同。2004 节段 X 的远端部分具有刷状突起。