Dilar rotundatus Zhang, Liu & Winterton

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 : 137-138

Dilar rotundatus Zhang, Liu & Winterton , sp. nov.

( Figs. 8 , 38–41 )

Diagnosis. This species is characterized by the male gonocoxite 10, which is slenderly elongated and incurved anteriorly, but inflated posteriorly with round tip. The forewing of this species is densely spotted, with spots arranging as several transversely arcuate stripes.

Description. Male. Body length 4.8 mm.

Head pale yellowish brown, with pale yellow setose tubercles. Compound eyes blackish brown. Antenna pale yellowish brown, flagellum with all flagellomeres lost.

Prothorax yellowish brown, pronotum pale brown, medially with a pair of ovoid markings; mesothorax yellowish brown, mesonotum dark brown on anterior and lateral margins, scutellum with posterior half dark brown, laterally with a pair of pale yellow oblique stripes; metanotum yellowish brown, slight darker on lateral margins. Legs pale yellowish brown, femora blackish brown at tip. Wings hyaline, slightly smoky brown, with numerous dark spots. Forewing densely spotted, proximal spots slightly darker, arranging as transversely arcuate pattern, an immaculate area present distal to median nygma. Hindwing slightly paler than forewing, immaculate.

Abdomen brown, pregenital segments dorsally dark brown. Tergum 9 elongated, in dorsal view with an arcuate anterior incision and a deeply U-shaped posterior incision, leaving rather narrow median portion and a pair of subtriangular hemitergites, which are obtuse distally and densely haired. Sternum 9 obviously shorter than tergum 9, subtriangular. Ectoproct in dorsal view nearly hexagonal, posterodorsally with a pair of spinous projections and a pair of short, feebly sclerotized, digitiform projections, posteroventrally with a pair of unguiform projections. Gonocoxite 9 anteriorly broad and spoon-shaped in lateral view, posteriorly narrowed and strongly curved posteroventrally, with spinous tip; gonocoxite 10 slenderly elongated with hook-like anterior apex, but strongly inflated posteriorly with rotund tip; gonarcus slendely beam-shaped, laterally connecting to bases of gonocoxites 9. Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate.

Female. Unknown.

Materials examined. Holotype ♂, THAILAND: Loei, Phu Ruea NP, Pha Lon Noi [17°30.502'N, 101°20.868'E], 1343 m, 12–19.III.2007, Patikhom Tumtip ( CAU).

Distribution. Thailand (Loei).

Etymology. The specific epithet “ rotundatus ” refers to the male gonocoxite 10 with inflated and rotund tip in the new species.

Remarks. Although the single type of this new species is poorly preserved with largely damaged wings, the male genitalia clearly shows that it is a peculiar species based on the male gonocoxite 10 with a slenderly elongated anterior portion and a strongly inflated, rounded posterior apex. We could not find any species closely related to this new species based on the male genital characteristics.

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 38 – 41. Dilar rotundatus Zhang, Liu & Winterton, sp. nov. 38. Male genitalia, dorsal view; 39. Male genitalia, ventral view; 40. Male genitalia, lateral view; 41. Male ectoproct, caudal view. Scale bars: 0.5 mm.