Cheumatopsyche songda 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 : 141-143

Cheumatopsyche songda Oláh & Johanson , new species

Fig. 339–343

This species is close to C. kysonia , new species but the indistinct pale spots on the forewings are restricted to the basal area of the anal veins. The two species is furthermore separated by the presence of shorter and wider apical lobes on segment IX in C. songda , not triangular as in C. kysonia , and the harpagones of C. songda are abruptly narrowing before apices, not narrowly triangular as in C. kysonia . Cheumatopsyche songda also have a more developed vestigial ventral endothecal, membranous lobe in the phallus; the apicoventral lobes on segment X both form a pair of dorsal processes, clearly visible in dorsal view; and the apicoventral spiny lobe of segment IX is much longer.

Male. Body and wings brown with brown pubescence; forewing with pale spotted area restricted to basal area of anal veins. 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 7 lighter coloured warts. Proepisternum without swollen setal wart. Protarsal claws asymmetrical, laterally flanked by setal bundle. Forewing length 7.0 mm, hind wing length 5.1 mm. Hind wing fork I absent.

Male genitalia. Segment IX fused annularly; tergum short, rounded dorsally in lateral view ( Fig. 339); sternum much longer than tergum, produced into long, tungue-shaped ventrocaudal spiny lobe with 8–10 stout stiff spines ( Fig. 340); anterior margins of segment IX uniformly convex; apical lobe on posterolateral margins broad, rounded, except with slightly concave apices, located slightly above mid-height of segment; bordering wide articulation cavity of coxopodites ( Fig. 339); spine row on posterior margins of segment IX complete (not illustrated); tergal spines longer and stiffer than spines on apical lobes. Intersegmental step between segment IX and segment X shallow, occupied by segment X ( Fig. 339). Segment X short, broad in lateral view; slightly tapering distad; apex strongly curving dorsad, tapering. Setaless mesocaudal lobe broadly triangular ( Fig. 341), together with apicoventral setal lobes being arrow-head shaped ( Fig. 341). Apicoventral setal lobes completely fused with distal part of segment X, delineated by setae, forming setose bulge. Lateral setose areas forming pair of elevated warts slightly ventrally on segment X, clearly visible in both dorsal and lateral view ( Fig. 339, 341); apices slighly exceeding lateral margins of segment X in dorsal view ( Fig. 341). Dorsal and lateral interlobular gaps on segment X absent. Obliquely transverse sutures present, dividing segment X into less sclerotised basal part and more strongly sclerotised distal part. Strongly sclerotised longitudinal sutures tangent with transverse sutures; forming continuation of apicoventral setal lobes ( Fig. 339); looping around lateral setose areas. Coxopodites strongly exceeding apex of segment X, straight, dilating distad in lateral view ( Fig. 339); in ventral view, narrowest at mid-length, slightly curving mesad ( Fig. 342). Harpagones laterally flattened, trapezoid in lateral view ( Fig. 339); slender, slightly narrowing distad in ventral view; with two apical setae ( Fig. 342). Phallotheca ( Fig. 343) strongly narrowing towards mid-length before broadening apically; sclerotised endothecal process long, rounded, phallotremal sclerites broad, vestigial ventral endothecal membranous lobe well defined.

Holotype male: VIETNAM: Ha Son Binh Province: Hoa Binh, 12 km to Dabac , 30.i.1986, light [J. Oláh] ( OPC, in alcohol).

Paratypes: same data as holotype — 3 males ( OPC, in alcohol) .

Distribution: Vietnam (Ha Son Binh Province).

Etymology: after the river “Song Da”, at the type locality.