Hydropsyche sangbung Oláh & Johanson, 2008

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 : 96-98

Hydropsyche sangbung Oláh & Johanson , new species

Fig. 146–150

Hydropsyche sangbung is morphologically similar to H. lomdom , new species. Hydropsyche sangbung is recognized by its longer segment IX; its apical lobes on segment IX are not sharply triangular; the apical end of the median keel is not located posteriorly of the apical lobes; segment X has different shape, including presence of lateral setose areas located medially, not ventrally; the paired apicodorsal setose lobes are not fingershaped, but hump-like in dorsal view. Finally, the median surface of harpagones is not excavated spoon-like.

Male. Body and wings brown with light pubescence. Maxillary palp formula I-II-(III, IV)-V, segment V as long as segments I–IV together. Dorsum of head dark brown, with 9 dark brown setal warts. Swollen setal wart present on proepisternum. Pretarsal claw asymmetrical, laterally flanked by setal bundle. Spur formula 244. Protibiae each with posteroapical spur smaller than anteroapical spur.

Wings. Venation typical for the genus. Forewing crossveins m-cu and cu located separately. Sc and R, and Cu2 and A running separately before costa. Hind wing Sc and R meeting before costa about at crossvein r. Stem of M and Cu1 situated closely. Median cell closed. Fork 1 present. Forewing length 10.0 mm, hind wing length 8.0 mm.

Male genitalia. Abdominal segment IX fused annularly, short ( Fig. 146). Median keel long, broad ( Fig. 147); dorsal surface granulose; lateral surfaces flat; anterior margin arciform; dorsum short, ventrum about half as long as dorsum ( Fig. 146). Antecosta on both sides well developed, forming double line narrowing dorsally before margin; external groove of each antecostal suture well developed. Apical lobe on posterolateral margins triangular, right angled, comprising bulk of segment IX ( Fig. 146). Posterior spine row continuous, absent on dorsum ( Fig. 146, 147). Depression between segments IX and X long, shallow, with obtuse angle. Body of segment X long, nearly quadrangular in lateral view ( Fig. 146); rounded quadrangular in dorsal view. Lateral setose areas (preanal appendages) located medially, fading into loosely packed group of setae. Apicoventral setose lobes modified into pair of digitiform processes, with setae restricted to apex; medium part long, clavate ( Fig. 146, 147). Dorsal, interlobular gap long and wide, anteriorly encircled by apicoventral digitiform processes and apicodorsal setose lobe. Apicodorsal setose lobes reduced into pair of small, setose humps at rim of dorsum ( Fig. 146). Smooth cavity on segment absent. Short, darkly pigmented, transverse suture running ventrally on each side from bottom of intersegmental depression. Longitudinal suture running below each lateral setose areas, and parallel with ventral margins of segment X. Additional, suture-like, line running parallel above lateral setose areas. Coxopodites long, slender, basally sinuous, slightly dilating distally from half-length ( Fig. 146); gently curving mesad in ventral view ( Fig. 148). Harpagones slightly narrowing toward half-length, almost parallel sided thereafter, both apices curving upward ( Fig. 146) and mesad ( Fig. 148); mesal surface not excavated spoon-like. Phallic apparatus simply bent ( Fig. 149), broadening along ventrad curving basal section. Phallotheca with concave dorsum ( Fig. 149). Phallotremal sclerites absent. Apex of phallotheca with wide, bilobed sclerous ventral lobe, with wide central incision visible in ventral and dorsal view ( Fig. 150). Pair of small, slender, anterad orienting dorsolateral membranous lobes present, each with very small apex forming sclerotized, broad spine. Endothecal membrane in dorsal subapical trough combined with sclerous endothecal processes of small, chitinized finger-like lobes.

Holotype male: VIETNAM: Nghta Bihn Province , Bung stream, 10.i.1991, light [S. Andrikovics] ( OPC, alcohol).

Distribution. Vietnam.

Etymology. sangbung , from Vietnamese “tia sang”, meaning stream, and Bung, the type locality of the species.