Cheumatopsyche costalis (N Banks, 1913)

Oláh, J. & Johanson, K. A., 2008, Generic review of Hydropsychinae, with description of Schmidopsyche, new genus, 3 new genus clusters, 8 new species groups, 4 new species clades, 12 new species clusters and 62 new species from the Oriental and Afrotropical regions (Trichoptera: Hydropsychidae), Zootaxa 1802, pp. 1-248 : 204

Cheumatopsyche costalis species group

Species group of bilobed segment X with shortened ventroapical lobe. Close to C. dubitans species group, differentiated by the shorter ventroapical lobe. Also close to the C. expeditionis species group having however not trilobed, but bilobed segment X or maximum slightly convex apical margin of the bare unsetose mesal lobe. The basic genital plan of the genus otherwise is completely present also in this group. Segment X mostly bilobed. A pair of setose ventroapical lobe shortened into a reduced process or just a wart mostly straight both in dorsal and lateral aspects. Interlobular gaps at the termination of segment X very much reduced, visible only in dorsal aspect, usually as a shallow and wide gap. Wartlike lateral setose area, the vestigium of preanal appendages located well distad on segment X. Distributed in South and Southeast Asia, including the Southeast Asian archipelago ( Oláh et al. 2008)