Hydropsyche serpentina

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 : 145

Hydropsyche serpentina species clade

Fig. 206

The species in the Hydropsyche serpentina species clade have a phallic apparatus modified into a ring-shaped fusion of the basal and terminal sections of the phallotheca, forming a double-sinuate bend. The ring-shaped bend continues into the horizontal terminal section and is rounded angled, at least dorsally. The length of the bend is almost double the length of the horizontal, terminal segment.