Rhyacophila lignumvallis sp. nov., wing venation. C, costal vein; Sc, subcostal vein; R1–R5, first to fifth branches of the radial vein; M1–M4, first to fourth branches of the medial vein; M3+4, medial vein 3+4 (hindwing); Cu1a, anterior branch of first cubital vein; Cu1b, posterior branch of first cubital vein; Cu2, second cubital vein; 1A–3A, first to third anal veins; r, radial crossvein; r-m, radiomedial crossvein; m-cu, mediocubital crossvein; I–V, first to fifth wing forks; TC, thyridial cell. Scale bar: 1 mm. Illustrations were produced by Ernesto Rázuri-Gonzales.