Hyalopsyche trunga, Oláh, János & Johanson, Kjell Arne, 2010

Oláh, János & Johanson, Kjell Arne, 2010, Contributions to the systematics of the genera Dipseudopsis, Hyalopsyche and Pseudoneureclipsis (Trichoptera: Dipseudopsidae), with descriptions of 19 new species from the Oriental Region., Zootaxa 2658, pp. 1-37 : 18-19

Hyalopsyche trunga , new species

Figs 40–44

This species is small and brown, with well-pigmented and thick veins. The species is unique in having complete forewing venation and reduced hind wing forks I and fork III. In H. winkleri Ulmer from Borneo and Sulawesi a similar reduction of the hind wing venation is accompanied by the reduction of forewing fork I. The type species of the Hyalopsyche , H. palpata Ulmer described from “ French Congo,” has complete forks in the forewing and reduced hind wing fork I. Another unique feature in H. trunga is the absence of the foreleg preapical spur. The phallic apparatus has an apical patch of small spines and the dorsal endothecal lobe is elongate and directed ventrad.

Male. Head shorter than wide. Eyes large; interocular distance narrow on face of frontoclypeal and labral area, wider on vertex. Epicranial groove, especially groove stem, coronal groove, well developed; frontal grooves short, almost indiscernible. Vertexal or frontal medioantennal and vertexal lateroantennal compact setose warts partially fused, vertexal medioocellar diffuse setose warts present; pair of occipital compact setose warts dominating on posterodorsal region of head; postgenal compact setose warts present. Maxillary palp formula I-II-IV-III-V. Antennae stout, 1.3 times longer than forewings; scapes short, less than half as long as head; closely set, almost touching. Interantennal distance short. Lateral cervical sclerites with narrow anterior arms articulating anteriorly with back of head with occipital condyle above posterior tentorial pits; fused to posterior cervical sclerites. Posterior cervical sclerites forming broad triangular plates reaching prothoracic episternum, articulating to weakly sclerotized anteromedian band of prothoracic eusternum. Two pairs of rounded pronotal compact setose warts present, lateral warts slightly smaller than dorsal warts. Pair of mesoscutal compact setose warts longitudinally ovoid; pair of mesoscutellar compact setose warts triangular, longitudinally elongate, narrowing posterad. Spurs 2, 4, 4. Foreleg posteroapical spur small. Leg claws small, symmetrical. Forewing length 4.4 mm. Forewing membrane and veins light brown, covered by scarce, cinereus setae. Forewing venation complete, discoidal cell long; hind wing venation without apical forks I, III and IV.

Male genitalia. Segment IX with well-developed tergite and sternite; tergite half as long as sternite, long triangular, narrowing ventrolaterad; sternite quadrangular, narrowing anterodorsad; narrowing tergal and sternal straps hinge together longitudinally. Segment X forming less-pigmented hood with weakly discernible setose area. Depression between segments IX and X almost filled, weakly stepwise in lateral view. Preanal appendages elongate filiform in dorsal and lateral views. Inferior appendages long, triangular in lateral view; elongate in ventral view; mesal surfaces each armed with dorsal row of long spines and ventral patch of short spines. Outer lateral surfaces covered by fine setae. Phallic apparatus forming slender tube consisting of phallotheca and endotheca; tip of endotheca or aedeagus obscurely structured, depending on state of erection; in holotype dorsal spines absent and ventral pair of spines present; patch of 8–10 spines almost indiscernible, spines not set in pair of lines as usual but collected in single group in dorsal view.

Holotype male: VIETNAM: Lam Dong Province, Baoloc, River Trungrieng, 23.x.1988, singled [J. Oláh], (OPC).

Etymology. Trunga , from the type locality, River Trungrieng.

Figures

FIGURES 40 – 44. Hyalopsyche trunga, new species, holotype male. 40 — right wings, dorsal; 41 — genitalia, left lateral; 42 — left inferior appendage, mesal; 43 — inferior appendages, ventral; 44 — phallus, left lateral.