Dilar dulongjiangensis, Zhang, Wei, Liu, Xingyue, Aspöck, Horst & Aspöck, Ulrike, 2015

Zhang, Wei, Liu, Xingyue, Aspöck, Horst & Aspöck, Ulrike, 2015, Revision of Chinese Dilaridae (Insecta: Neuroptera) (Part III): Species of the genus Dilar Rambur from the southern part of mainland China, Zootaxa 3974 (4), pp. 451-494 : 471-472

Dilar dulongjiangensis sp. nov.

( Figs. 8 , 50–53 )

Diagnosis. This species is characterized by the forewings with many brown spots irregularly patterned and with a big dark spot around the median nygma, and by the male ninth tergite with an elongate dorsoprocessus in dorsal view.

Description. Male. Body length 6.0 mm; forewing length 10.2 mm, hindwing length 8.5 mm.

Head yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna with ca. 25 segments, pale yellowish brown, pedicel with brown annular stripes, flagellum unipectinate on most flagellomeres, medial branches much longer than those on both ends, longest branch nearly 7.0 times as long as relevant flagellomere, but branch of 1st flagellomere short and dentate, distal six flagellomeres simple.

Prothorax pale yellow, pronotum pale yellowish brown, with anterior margin and posterolateral corners yellow, medially with a pair of ovoid markings; mesothorax pale yellowish brown, mesonotum dark brown on anterior and lateral margins, scutellum with anterior half brown; metanotum pale yellowish brown, slightly darker on lateral margins. Legs pale yellow, femora blackish brown at tip. Wings transparent, slightly yellow. Forewing ~2.0 times as long as wide, densely spotted, proximal spots slightly darker, irregularly arranged, a big immaculate area present distal to proximal nygmata and median nygmata; three nygmata present on proximal and median portion of forewing, a large brownish marking present around the median two nygmata. Hindwing ~2.0 times as long as wide, much paler than forewing; one nygma present at middle. Veins pale brown, crossveins much paler than longitudinal veins. Forewing with trichosors present along wing margin between R and CuP; costal crossveins simple, but occasionally forked; Sc just touching R in pterostigmatic region, terminally leaving several weak veinlets; Rs with four main branches. Hindwing extremely pale with trichosors present along wing margin between R and CuA; Rs with four main branches.

Abdomen yellow, pregenital segments dorsally pale yellowish brown. Ninth tergite in dorsal view with a nearly arcuate anterior incision, a nearly V-shaped posterior incision and an elongate dorsoprocessus, leaving a pair of subtrapezoidal hemitergites, which are obtuse distally and densely haired ( Fig. 50 ); in lateral view broad ( Fig. 52 ), with straight ventral margin and nearly truncate posterior margin. Ninth sternite considerably shorter than ninth tergite, arcuately convex posteriad. Ectoproct in dorsal view posterodorsally with a pair of subtriangular and flattened projections, posteroventrally with a pair of bifid unguiform projections, a feebly sclerotized, digitiform projection and a pair of flattened projections. Ninth gonocoxite ( Fig. 50 ) strongly inflated, unguiform at tip; tenth gonocoxite incurved at base, with spinous tip, submedially with a pointy lobe connecting to ninth gonocoxite; gonarcus slendely beam-shaped, laterally connecting to bases of ninth gonocoxites. Hypandrium internum narrowly trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, CHINA: Yunnan Province, Nujiang, Dulongjiang [27°51′N, 93°19′E], 1409 m, 29.VI.2013, Wei Zhang ( CAU).

Distribution. China (Yunnan).

Etymology. The new species is named after its type locality, Dulongjiang, which is a locality of the Gaoligong Mountains at the boundary between China and Myanmar, with subtropical mountainous habitat and extraordinarily rich biodiversity.

Remarks. The new species appears to be closely related to D. geometroides Aspöck & Aspöck by having the inflated ninth gonocoxite and the slender tenth gonocoxite, which is submedially with a pointy lobe connecting to ninth gonocoxite. However, this species can be distinguished from the latter species by the male ectoproct in dorsal view posterodorsally with a pair of subtriangular and flattened projections. In D. geometroides Aspöck & Aspöck , the male ectoproct in dorsal view posterodorsally has a pair of strongly sclerotized, unguiform projections, which are curved ventrally.

Figures

FIGURES 7 – 9. Adults of Dilar spp. 7. D. wuyianus Yang, male holotype; 8. D. dulongjiangensis sp. nov., male holotype; 9. D. guangxiensis sp. nov., male holotype. Scale bars: 1.0 mm.

FIGURES 50 – 53. Dilar dulongjiangensis sp. nov. 50. Male genitalia, dorsal view; 51. Male genitalia, ventral view; 52. Male genitalia, lateral view; 53. Male ectoproct, caudal view. Scale bars: 0.5 mm.