Dipseudopsis cocon, 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 : 4-6

Dipseudopsis cocon , new species

Figs 1–6

This species is similar to D. collaris McLachlan, 1863 , and D. robustior Ulmer, 1929 , but it differs by having pronotum and mesonotum uncoloured and the modified spur more deeply bifid.

Male. Body uniformly light brown, only edges or margins darker brown; mesonotum not darker brown than pronotum; antennae, palpi and legs slightly lighter brown, almost ochraceous.

Head. Labrum dark brown. Pair of large, setose, mesal, longitudinal bands present, representing fused vertexal lateroantennal and vertexal ocellar warts. Each lateral cervical sclerite broadly triangular.

Thorax. Mesoscutum sparsely covered by small alveoli, divided medially by longitudinal, shallow furrow. Mesoscutellum with pair of fragmented compact setal warts. Spur formula 2, 4, 4; mid leg posterior spurs longer than anterior spurs; hind leg modified spur branching from apical 2/3rds, crescent-shaped, with 2 sinuate, sub-equal branches directed mesad after basal overcrossing.

Forewing length 11.3 mm; membrane brown, with 2 inconspicuously faded spots; 1 spot semicircular, located distally of cord; 1 large spot located above arculus.

Male genitalia. Segment IX with large tergite and slightly larger sternite connected; these 2 sclerites connected by narrow strip on each side composed of antecostal ridge and fused base of large preanal appendage. Tergite IX subquadrangular in lateral view, with small dorsoapical rim triangular in lateral view; rounded in dorsal view, slightly overhanging segment X; setose fields absent. Sternite IX subquadrangular in lateral view, with bulging basodorsal corners articulating with antecostal ridge, preanal appendages and mesosuperior processes. Phallocrypt composed of long, sclerotized pair of dorsal processes embedded in conjunctive membranes encircling dorsum of phallobase, connecting to venter of segment X; pair of short lateral, weakly sclerotized lobes fixed to short phallic apodeme. Basal plate below phallocrypt complex, forming long rod of apodemes of inferior appendages, not attached by sclerotized connection to phallocrypt or to phallobase, moving freely according to clasping movement of inferior appendages. Apicodorsal corners of sternite IX with small areas of microtrichia. Segment X as long as inferior appendages, slightly overlapped by tergite IX, forming heavily pigmented hood notched apically in dorsal view with weakly discernible setose area on each apex; thumb-shaped, slightly concave dorsally in lateral view. Intersegmental depression between segment IX and segment X forming short vertical concavity in lateral view by slightly overhanging tergite IX. Preanal appendages triangular, auriform, narrowing dorsoapicad. Preanal appendages fused with antecostal ridge of segment IX along wide basal part, hinged dorsally to tergite IX, ventrally to basodorsal corner of sternite IX. Inferior appendages each as long as segment X, sinuous, with regularly concave dorsum and irregularly convex venter in lateral view and with triangular projection visible near base. Phallic apparatus small; phallotheca forming heavily sclerotized, broad, basal tube and slightly narrowing ventroapical lobe; no minute setae visible on basal part. Delineation of membranous dorsal part, apical endotheca, and aedeagus obscured; weakly sclerotized phallotremal sclerite complex present, position varying according to level of aedeagus erection.

Holotype male: VIETNAM: Hanoi, West Lake, 28.x.1986, at light [J. Oláh], (OPC).

Etymology. Cocon , from Vietnamese “co con,” meaning collar, referring to the similarity between this species and D. collaris McLachlan.

Figures

FIGURES 1 – 6. Dipseudopsis cocon, new species, holotype male. 1 — right forewing, dorsal; 2 — left hind leg apical tibial spurs; 3 — genitalia, left lateral; 4 — genitalia, dorsal; 5 — left inferior appendage, ventral; 6 — phallus, left lateral.