Dilar taibaishanus, Zhang, Wei, Liu, Xingyue, Aspöck, Horst & Aspöck, Ulrike, 2014

Zhang, Wei, Liu, Xingyue, Aspöck, Horst & Aspöck, Ulrike, 2014, Revision of Chinese Dilaridae (Insecta: Neuroptera) (Part I): Species of the genus Dilar Rambur from northern China, Zootaxa 3753 (1) : -

Dilar taibaishanus sp.nov.

( Figs. 5 , 30–33 )

Diagnosis. This species is characterized by the marking pattern of mesonotum with a brown marking on posterior half of scutellum, the forewings with dense small dark markings, and the male gonarcus/ninth gonocoxite complex with ninth gonocoxite much shorter than tenth gonocoxite and bifurcated distad.

Description. Male. Body length 4.1 mm; forewing length 8.2 mm, hindwing length 6.9 mm.

Head ( Fig. 5 ) yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna (partly damamged in holotype) pale yellowish brown, flagellum unipectinate on most flagellomeres, medial branches much longer than those on both ends, longest branch nearly 4.0 times as long as relevant flagellomere, but branch of 1st flagellomere short and dentate.

Thorax ( Fig. 5 ) yellowish brown; pronotum dark brown, medially with a pair of ovoid markings; mesonotum dark brown on anterior and lateral margins; metanotum slightly darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings ( Fig. 5 ) hyaline, slightly pale yellowish brown, with numerous brownish spots. Forewing ~3.0 times as long as wide, densely spotted, proximal spots slightly darker, arranging as transversely arcuate pattern, an immaculate area present distal to median nygma; three nygmata present on proximal and median portions, median one much larger than rest two near wing base. Hindwing ~2.4 times as long as wide, slightly paler than forewing, with similar marking pattern; one nygma present at middle. Veins pale yellow, crossveins much paler than longitudinal veins. Forewing with trichosors present along wing margin between R and CuP; costal crossveins simple, but occasionally forked; Sc terminally leaving several weak veinlets; Rs with four main branches; MA fused with R at wing base, proximally with no crossvein connecting to MP; MP with two main branches; two gradate crossveins present at middle. Hindwing with trichosors present along wing margin between R and CuP; Rs with three main branches.

Abdomen yellow, pregenital segments dorsally pale yellowish brown. Ninth tergite ( Fig. 30 ) in dorsal view with an arcuate anterior incision and a deeply V-shaped posterior incision, leaving rather narrow median portion and a pair of subtriangular hemitergites, which are obtuse distally and densely haired; in lateral view broad, with straight ventral margin and arcuate posterior margin. Ninth sternite ( Fig. 31 ) obviously shorter than ninth tergite, arcuately convex posteriad. Ectoproct ( Figs. 30, 33 ) in dorsal view nearly semicircular, posterodorsally with a pair of short and flattened projections, which are serrate at tip, posteroventrally with a pair of bifid unguiform projections and a pair of short, feebly sclerotized, digitiform projections. Gonarcus/ninth gonocoxite complex ( Fig. 30 ) comprising two pairs of long sclerites (i.e. ninth and tenth gonocoxites) and a transversely narrow sclerite (i.e. gonarcus = eleventh gonocoxites); ninth gonocoxite strongly inflated on proximal half and distinctly narrowed and bifurcated on distal half; tenth gonocoxite slenderly elongate, much longer than ninth gonocoxite, inflated anteriorly, with hook-like tip; gonarcus beam-shaped, expanded on both ends, laterally connecting to bases of ninth gonocoxites. Hypandrium internum ( Fig. 31 ) trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Type material. Holotype ♂, CHINA: Shaanxi Province, Mt. Taibaishan, Haopingsi [33°59′N, 107°39′E], 18.VII.1982, Jingruo Zhou & Lan Liu ( CAU).

Distribution. China (Shaanxi).

Etymology. The specific epithet “ taibaishanus ” refers to the type locality, i.e. Mt. Taibaishan, Shaanxi Province, China, of the new species. It is an adjective in the nominative masculine singular.

Remarks. The new species appears to be closely related with D. septentrionalis Navás in having similar wing marking patterns and male genitalia with elongate tenth gonocoxite, which is angulately curved anteriorly, and with ninth gonocoxite inflated on proximal half, but it can be distinguished from the latter species by the male gonarcus/ ninth gonocoxite complex with ninth gonocoxite bifurcated posteriorly. In D. taibaishanus sp.nov. the ninth gonocoxite is simply unguiform posteriorly.

Figures

FIGURES 1 – 5. Adults of Dilar spp. 1. D. hastatus sp. nov., male holotype; 2. D. septentrionalis Navás, male; 3. D. sinicus Nakahara, male; 4. D. spectabilis sp. nov., male holotype; 5. D. taibaishanus sp. nov., male holotype. Scale bars: 1.0 mm.

FIGURES 30 – 33. Dilar taibaishanus sp. nov. 30. Male genitalia, dorsal view; 31. Male genitalia, ventral view; 32. Male genitalia, lateral view; 33. Male ectoproct, caudal view. Scale bars: 0.5 mm.