Hydropsyche tanung 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 : 69-70

Hydropsyche tanung Oláh & Johanson , new species

Fig. 103–107

This species resembles H. tanua , new species, especially in segments IX and X. The apical lobe on segment IX of H. tanua is, however, straight cut, rounded quadrangular, not dorsally triangular as in H. tanung ; and the apicodorsal lobe on segment X is larger than in H. tanung . Hydropsyche tanung is easily identified by the presence of modified spine structures on the membranous endothecal processes. The paired spines connected with the phallotremal sclerites are short, stout and curving basad, while in H. tanua the spines are long, slen- der, and curve distad. In H. tanung the spines on the dorsolateral membranous endothecal process are characteristically short and curved. The forewing nygma is more weakly pigmented, thus easily differentiated from H. tanua which has darkly pigmented nygma. Moreover, the forewing membrane is pale spotted, not uniformly coloured as in H. tanua . Hydropsyche tanung has a long thyroidal window on the forewing membrane, which is absent in H. tanua .

Male. Body small, brown. Forewing membrane brown, with indistinct, light spots; thyroidal window bright, long. Maxillary palp formula I-II-(III, IV)-V, segment V as long as sum of segments I–IV. Dorsum of head brown with 9 brown setal warts. Anteromesal setal wart mesally divided into 2 warts. Swollen setal wart present on proepisternum. Pretarsal claw asymmetrical, laterally flanked by setal bundle. Spur formula 244. Protibia with posteroapical spur smaller than anteroapical spur.

Wings. Venation typical for the genus. Forewing crossveins m-cu and cu separate. Sc and R, and Cu2 and A separate 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 6.5 mm, hind wing length 5.2 mm.

Male genitalia. Abdominal segment IX fused annularly. Median keel almost as broad as long ( Fig. 104); dorsal surface granulose, lateral surface glabrous; keel occupying entire dorsum of segment IX, shifted posterad; anterior margin arciform; dorsum more strongly produced posterad than ventrum; ventrum shorter than dorsum ( Fig. 103). Antecosta well developed, forming dorsally narrowing double line, nearly reaching median keel before margin; represented by external groove of antecostal suture. Apical lobe on posterolateral margins very long, parallel-sided, with rounded apex ( Fig. 103). Posterior spine row intermittent, present on keel slopes and apical lobes, absent between. Depression between segments IX and X stepwise, delineated by distal end of median keel and short process of apicodorsal setose lobes. Body of segment X rounded triangular in lateral view ( Fig. 103), rounded quadrangular in dorsal view ( Fig. 104). Lateral setose areas (preanal appendages) located distally, forming scattered setose areas. Apicoventral setose lobes modified into pair of long, slender processes with apical setae; each slightly curving ventrad before apex ( Fig. 103); dorsal tip bending dorsad ( Fig. 103); straight, directed slightly mesad by broadening apex ( Fig. 104). Dorsal interlobular gap widely ovoid, demarcated by slender apicoventral setose lobes; anterior base of gap narrowly concave. Apicodorsal setose lobe forming pair of short process shifted anterad to intersegmental depression. Smooth cavity present, developed into large, circular, shallow depression, dominating basal half of segment X. Longitudinal suture encircling shallow cavity located anteroventrally. Coxopodites reaching apex of apicoventral processes; slender, straigh, dilating dorsad at distal one-third their lengths. Harpagones tapering along their length in lateral view ( Fig. 103); in ventral view nearly parallel-sided before mid-length ( Fig. 105). Phallic apparatus simply bent, broadening almost threefold along ventrad orientinng basal section; horisontal section of phallotheca slender, central part curving ventrad ( Fig. 106). Endophallus forming well pigmented narrow tube, reaching over phallic apparatus bend. Phallotremal sclerite flat in lateral view ( Fig. 106); tapering distad in dorsal view ( Fig. 107); pair of short, stout, basad curving spines being associated with phallotremal sclerites. Sclerotised spine on tip of dorsolateral membranous endothecal process short, gently curved; additional, single dorsomedian membranous endothecal process with stout spine present at mid-length of phallotheca. Apical membranous endothecal process with pair of short, stout spines.

Holotype male: VIETNAM: Dalat , Tanung Valley, 13.ii.2006, light [J. Oláh, Jr.] ( OPC, alcohol).

Paratypes: same data as holotype — 2 males ( OPC, alcohol) ; ditto, except 17.ii.2007, [G. Simay] — 1 male ( OPC, alcohol); Lamdong, Dalat, Monastery balcony, 17.x.1988, light [J. Oláh] — 1 male ( OPC, alcohol) .

Distribution. Vietnam.

Etymology. tanung , named after the type locality, the Tanung Valley.