Dipseudopsis vienha, 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 : 13-15

Dipseudopsis vienha , new species

Figs 28–33

This species is dark with contrasting wing-pattern. It resembles D. varians Ulmer , from which it is easily discriminated by its globular segment X that lacks apical excisions in dorsal view, and by its vertically quadrangular elongate preanal appendages.

Male. Body dark chestnut brown with contrasting yellow body parts and wing pattern. Head dorsum, scapes, genae, cervical sclerites, prothorax yellow; proboscis, intersegmental and intersclerite conjunctive membranes and articulations, as well as anterior part of abdomen whitish. Antennae, maxillary palps and labial palps, mesonotum, metanotum, legs, abdominal segments VII and VIII, and genitalia dark chestnut brown. Labrum dark chestnut brown. Occipital warts covered by short, blackish, stiff setae; setae on postgenal compact setose warts long; pair of large, setose mesal longitudinal bands possibly representing fused vertexal lateroantennal and vertexal ocellar diffuse setose warts. Lateral cervical sclerites long, triangular. Mesoscutum sparsely covered by small alveoli, divided by shallow longitudinal, median furrow; mesoscutellum with 2 bands of setal alveoli separated by median groove, forming diamond-shaped, elevated surface; lateral alveoli large. Foreleg posteroapical spurs slightly longer than anteroapical spurs; mid leg posterior spurs longer than anterior spurs; hind leg with modified posteroapical spur simple, slightly longer than adjacent anteroapical spur, basal half unmodified, apical half twisted 180o into short spiral ridge with laterad-pointing apex; large basal part of modified apical half excavated; twisting concavity filled with closely set setal bundle, alveoli located on bottom of concavity.

Forewing length 12.0 mm. Forewing and hind wing membrane dark chestnut brown, slightly darker along veins; all membrane surfaces densely covered by short, dark, decumbent setae; forewings each with 2 hyaline spots: basal triangular spot between R1 and Cu1 to first fork on both Rs and M, and spot of subapical irregular transverse patch distal to cord translucent and contrasting. Hind wings each with single basal triangular hyaline spot.

Male genitalia. Segment IX consisting of weakly developed tergite and strongly developed sternite, connected on each side by very narrow strip composed of antecostal ridge and fused base of large preanal appendage; tergite triangular in lateral view, rounded triangular in dorsal view, deeply overhanging segment X; 2 lateral setose fields visible in lateral and dorsal views; sternite IX quadrangular in lateral view, with complex bulging basodorsal corner, articulating with antecostal ridge, preanal appendages and bases of mesosuperior processes in phallocrypt. Phallocrypt forming complete and complex ring encircling phallobase; composed of short ventral part, pair of elongate lateral parts, and short, weakly sclerotized mesosuperior part; covered dorsally by membranous basoventral part of segment X; phallobase fixed by short phallic apodeme to phallocrypt complex. Basal plate or long rod of apodeme of inferior appendages below phallocrypt complex not attached, moving freely; nearly 1/4th of apicodorsal corner of sternite IX densely packed with microtrichia and sharp cuticular denticles, this region bordered ventrally by long setae. Segment X longer than inferior appendages, originating deeply beneath tergite IX, forming heavily pigmented hood over phallus, with weakly discernible setose area on apex; globular in lateral view; globular-sagittate with constricted base and without apicomesal excision in dorsal view. Intersegmental depression between segment IX and segment X forming deep concavity in lateral view by overhanging tergite IX. Preanal appendages quadrangular auriform, without dorsoapical lobes; preanal appendages eachfused to antecostal ridge of segment IX along wide basal part, hinged dorsally to tergite IX and ventrally to basodorsal corner of sternite IX. Inferior appendages shorter than segment X; irregular, slightly elongate in lateral view, with small triangular projection dorsally at middle. Phallic apparatus small; phallotheca composed of heavily sclerotized, broad basal tube and narrowing ventroapical lobe; basal part with numerous, minute alveoli and small setae; delineation of membranous dorsal and apical endotheca and aedeagus obscure, with few weakly sclerotized phallotrema sclerites, their position varying according to erection state of aedeagus.

Holotype male: VIETNAM: Nam Bai Cat Tien National Park, 9.ii.2006, at light [J. Oláh, Jr. & Z. Ecsedi], (OPC).

Paratypes: Nam Bai Cat Tien National Park, 9.ii.2006, at light [J. Oláh, Jr. & Z. Ecsedi]— 1 male (OPC).

Etymology. Vienha , from “vien nho,” globule in Vietnamese, referring to the globular shape of segment X.

Figures

FIGURES 28 – 33. Dipseudopsis vienha, new species, holotype male. 28 — right wings, dorsal; 29 — left hind leg apical tibial spurs; 30 — genitalia, left lateral; 31 — genitalia, dorsal; 32 — inferior appendage, ventral; 33 — phallus, left lateral.