Cheumatopsyche rienga Oláh & Johanson, 2008

Oláh, János, Johanson, Kjell Arne & Barnard, Peter C., 2008, Revision of the Oriental and Afrotropical species of Cheumatopsyche Wallengren (Hydropsychidae, Trichoptera), Zootaxa 1738, pp. 1-171 : 83-84

Cheumatopsyche rienga Oláh & Johanson , new species

Fig. 200–203

This species is similar to C. carna from Thailand, but the lateral interlobular gaps are very short and narrow, not sinuous; the dorsal interlobular gap is short and heart-shaped in dorsal view, not deep; the bilobed harpagones have a long undividing base, which is very short in C. carna .

Male. Body and wings brown with brown pubescence. Maxillary palp segment I shortest, segment II longer, segments III and IV equally long, segment V as long as sum of segments I–IV. Head dorsum brown with 9 similarly coloured warts. Proepisternum without swollen setal wart. Protarsal claws symmetrical, without lateral setal bundle. Forewing length 5.4 mm, hind wing length 4.2 mm. Hind wing fork I present.

Male genitalia. Segment IX fused annularly; tergum short, sternum longer ( Fig. 200); anterior margins of segment IX convex, ventral-most part slightly produced anterad in lateral view ( Fig. 200); apical lobe on posterolateral margins absent, posteror spine row straight, complete ( Fig. 200), starting at small excision anteriorly of coxopodites; short hiatus separating long and stiff spines on tergal corner from other, shorter spines. Downward slope of segment X filling intersegmental step between segment IX and segment X. Segment X long, nearly triangular in lateral view ( Fig. 200). Setaless mesocaudal lobe straight; vertical in lateral view ( Fig. 200); slightly exceeding with straight posterior margin in dorsal view ( Fig. 201). Apicoventral setal lobes capitate in lateral view ( Fig. 200). Ventral margin of segment X reaching posterior margin of segment IX; meeting lower part of transverse sutures ( Fig. 200); in dorsal view ( Fig. 201) apicoventral setal lobes developing into mesad directed, quadrangular apices. Lateral interlobular gap narrow ( Fig. 200). Dorsal interlobular gap ( Fig. 201) nearly heart-shaped, encircled by apicoventral setal lobes. Pair of lateral setose areas forming elevated warts located posteroventrally on segment X, clearly visible in dorsal and lateral view; apices of warts not exceeding lateral margins of segment X in dorsal view ( Fig. 201); in lateral view located distantly from lateral interlobular gap. Transverse sutures strongly pronounced, clearly visible in lateral and dorsal view; dividing segment X into basal, slightly sclerotised part and distal, more strongly sclerotised part. Coxopodites extending slightly beyond apex of segment X, straight; slightly dilating at apices. Harpagones bilobed with long undivide base; dorsal branches small, straight, blunt; ventral branches claw-like, curving dorsad into pointing apex; slender, apically pointing in ventral view ( Fig. 202). Phallothecal dorsum ( Fig. 203) almost straight; sclerotised endothecal process long, nearly reniform; phallotremal sclerites broad, oriented ventrad in lateral view; vestigial membranous endothecal lobes not visible.

Holotype male: VIETNAM: Ha Son Binh Province: Hoa Binh, 8 km to Dabac , 21.x.1986, light [J. Oláh] ( OPC, in alcohol).

Paratypes: LAOS PDR: Luang Namtha Prov.: Nam Ha NBCA, Lakkhammai Village, Nam Leung stream, 749 m, UTM 47Q 0744602, 2339873, 30.iv.2005, light trap, loc 29 [N. Jönsson, T. Malm & B. Viklund] — 1 male ( NRM, in alcohol) .

Distribution: Vietnam, Laos PDR.

Etymology: from the special claw-like harpago, special “rieng” in Vietnamese.