Dipseudopsis viklundi, 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 : 15-17

Dipseudopsis viklundi , new species

Figs 34–39

The forewing pattern and the genital structures of this species resemble those of D. benardi Navás. However , the modified hind leg spurs are different in having only their mesal point crescent-shaped, and their lateral point being directed mesad, in right angle, and less sinuous. There are differences also in the genitalia: Segment X is much longer than the preanal appendages; the preanal appendages are nearly triangular auriform, excised apically; and the inferior appendages are almost triangular in lateral view.

Male. Body dark chestnut, cervical sclerite, pronotum, mesonotum and metanotum dark; occipital warts, postgenal warts, frontoclypeus, antennae, palps and legs lighter. Maxillary palp segment 3 originating subapically on segment 2. Lateral cervical sclerites broadly triangular; setose wart attached to dorsum of anterior arm of each cervical sclerite; entire central ridge of cervical sclerites covered by long setae. Pronotum dark. Mesoscutum sparsely covered by setae with very small alveoli in mesal bands, separated by longitudinal, median, shallow furrow. Mesoscutellum with pair of fragmented, compact setal warts. Mid leg posterior spurs longer than anterior spurs. Hind leg, modified, posteroapical spurs bifid at apical 1/4th, mesal branch crescent-shaped, pointing laterad in right angle, weakly sinuous; mesal branch directed laterad; lateral branch directed mesad. Forewing length 11.0 mm. Brown forewing membranes with 4 small contrasting translucent spots: (1) m–cu hyaline lunula (2) rounded spot distally of s, (3) rounded elongate posteriorly of cord, and (4) large arculus patch.

Male genitalia. Abdominal segment IX with nearly equally sized, shallow tergite and deep sternite connected on each side by narrow strip composed of antecostal ridge and fused base of large preanal appendage; tergite horizontally elongate, narrow, sinuous in lateral view, overhanging segment X; rounded in dorsal view; setose fields on tergite absent; entire surface covered by microtrichia; sternite nearly triangular in lateral view, bulging dorsobasal corners each forming articulation with antecostal ridge, preanal appendages and phallocrypt. Mesosuperior processes projecting from phallocrypt with long, sclerotized pair of dorsal processes embedded in conjunctive membranes encircling dorsum of phallobase, connecting it to venter of segment X. Pair of lateral sclerotized straps of phallocrypt complex visible, fixed to short phallic apodeme and apicodorsal corners of sternite IX. Basal plate forming long rod of apodeme of inferior appendages below phallocrypt complex, apparently not attached by sclerotized connection to phallocrypt or phallobase. Sinuous, internal ridge running from each basodorsal corner to middle of posterior margin. Apicodorsal corners of sternite IX each with small microtrichous area. Segment X longer than inferior appendages, originating deeply beneath tergite IX, forming heavily pigmented, slender, thumb-like hood above phallus in lateral view, with deep, narrow interlobular gap; setose area on apex weakly developed. Intersegmental depression between segment IX and segment X forming deep concavity in lateral view beneath overhanging tergite IX. Preanal appendages nearly triangular auriform, each slightly excised apically; venter narrowing in ventral view, broad in coronal plane. Preanal appendages each fused with 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; in lateral view sinuous, almost triangular, with concave dorsum and triangular venter. Phallic apparatus small; phallotheca forming heavily sclerotized, broad basal tube and slightly narrowing ventroapical lobe; basal part with minute alveoli; delineation of membranous dorsal and apical endotheca and aedeagus obscured; weakly sclerotized phallotremal sclerite complex present, its position varying according to erection state of aedeagus.

Holotype male: LAOS: Luang Phrabang Province, Nam Khan River, 500 m upstr. Mekong River, 293 m, UTM 48Q0200517, 2202237, 27.iv.2005, at light trap, loc 14 [N. Jönsson, T. Malm & B. Viklund], ( SMNH). Etymology. This species is named after Mr. Bert Viklund ( SMNH), one of the collectors of the species.

Figures

FIGURES 34 – 39. Dipseudopsis viklundi, new species, holotype male. 34 — right forewing, dorsal; 35 — left hind leg apical tibial spurs; 36 — genitalia, left lateral; 37 — genitalia, dorsal; 38 — inferior appendage, ventral; 39 — phallus, left lateral.