Dilar sumatranus Zhang, Liu, Aspöck & Aspöck, 2016

Zhang, Wei, Liu, Xingyue, Winterton, Shaun L., Aspöck, Horst & Aspöck, Ulrike, 2016, A review of the pleasing lacewing genus Dilar Rambur (Neuroptera, Dilaridae) from Southeast Asia, Zootaxa 4105 (2), pp. 124-144 : 138-140

Dilar sumatranus Zhang, Liu, Aspöck & Aspöck , sp. nov.

( Figs. 9 , 42–45 )

Diagnosis. This species is characterized by the male ectoproct in dorsal view posterolaterally with a pair of outcurved unguiform projections, and the slender male gonocoxite 10 with outcurved unguiform tip.

Description. Male. Body length 3.8 mm.

Head pale yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna pale yellowish brown, flagellum unipectinate on most flagellomeres, longest branch nearly 6.0 times as long as relevant flagellomere.

Prothorax yellowish brown, pronotum pale brown, medially with a pair of ovoid markings; mesothorax yellowish brown, mesonotum dark brown on anterior and lateral margins; metanotum yellowish brown, slight darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings largely damaged, with remaining part hyaline and covered by many long hairs.

Abdomen pale yellow, pregenital segments dorsally yellowish brown. Tergum 9 in dorsal view slightly concaved anteriorly and with a deeply V-shaped posterior incision, leaving a wide median portion and a pair of subtrapezoidal hemitergites, which are obtuse distally and densely haired. Sternum 9 obviously shorter than tergum 9, subtrapezoidal. Ectoproct in dorsal view with a nearly arcuate anterior incision and a slightly arcuate posterior projection, posterolaterally with a pair of outcurved, unguiform projections. Gonocoxite 9 in dorsal view broad on proximal half, with obtuse tip; gonocoxite 10 slenderly elongate, with outcurved, unguiform tip; gonarcus beamshaped, laterally connecting to bases of gonocoxites 9. Hypandrium internum narrowly trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, INDONESIA: Sumatra, Utara Dairi [2°0′39′′N, 98°58′42′′E], 8.VI.1997, E.W. Diehl ( HUAC).

Distribution. Indonesia (Sumatra).

Etymology. The specific epithet “ sumatranus ” refers to Sumatra where the single specimen of this new species was collected.

Remarks. The new species represents the first record of Dilaridae in the island Sumatra, Indonesia, despite the single type which is largely damaged. The completely preserved male genitalia of the new species shows that it appears to be closely related to D. macleodi from Borneo in having similar male gonocoxites 9 and 10. However, the new species can be distinguished from D. macleodi by the indistinct dorsoprocessus of the male tergum 9, the pointed apex of the male gonocoxite 10, and the absence of dorsal projections on the male ectoproct. In D. macleodi there is a well developed dorsoprocessus on the male tergum 9, the apex of the male gonocoxite 10 is obtuse [note that the gonocoxite 10 was erroneously interpreted as gonocoxite 9 in Oswald and Schiff (2001)], and the male ectoproct has a pair of spinous dorsal projections.

Figures

FIGURES 6 – 10. Adults of Dilar spp. 6. D. marmoratus (Banks), male holotype; 7. D. ohli Zhang, Liu, Aspöck & Aspöck, sp. nov., male holotype; 8. D. rotundatus Zhang, Liu & Winterton, sp. nov., male holotype; 9. D. sumatranus Zhang, Liu, Aspöck & Aspöck, sp. nov., male holotype; 10. D. zimmermannae Zhang, Liu, Aspöck & Aspöck, sp. nov., male holotype. Scale bars: 1.0 mm.

FIGURES 42 – 45. Dilar sumatranus sp. nov. 42. Male genitalia, dorsal view; 43. Male genitalia, ventral view; 44. Male genitalia, lateral view; 45. Male ectoproct, caudal view. Scale bars: 0.5 mm.