Dilar lulanae, Li & Liu, 2025

Dilar lulanae sp. nov.

Fig. 4 Common name. 路兰栉角蛉 View Figure 4

Diagnosis.

The new species is characterised by the forewing with densely transverse arcuate stripes (Fig. 4 A, B View Figure 4 ), by the presence of male dorsoprocessus (Fig. 4 C, I View Figure 4 ), by the male ectoproct posterodorsally with three sclerotised, tiny teeth at the middle (Fig. 4 C, I View Figure 4 ) and by the male gonocoxite 9 proximately with a rounded lobe curved ventrally and distally, with a pointed lateral projection and an elongate spinous medial projection (Fig. 4 C, I, L View Figure 4 ).

Description.

Male. Body length 9.2 mm; forewing length 11.8 mm, hindwing length 10.2 mm.

Head generally brown, with brown setose tubercles, tubercles surrounded by dark brown markings; vertex pale brown. Compound eyes blackish-brown. Antenna pale brown, scapus darker, each flagellum darker distally; flagellum pectinate, medial branches longer than those branches at base, longest branch nearly 6.2 times as long as corresponding flagellomere, distal six flagellomeres simple.

Thorax brown; pronotum with a pair of pale brown ovoid tubercles at middle, tubercles surrounded by dark brown markings; mesonotum darker at middle, as well as along anterior, posterior and lateral margins; metanotum much paler than mesonotum, with posterior margin slightly darker. Legs yellow, femora, tibiae and each tarsomere dark brown at tip. Wings pale brown (Fig. 4 A View Figure 4 ). Forewing 2.3 times as long as wide, with many transversely arcuate stripes, markings darker on base and costal space; two nygmata present at base and middle, median nygma surrounded by a brown spot; longitudinal veins pale yellow, interrupted by many brown spots; crossveins pale brown. Hindwing 2.1 times as long as wide, almost entirely pale brown, with less markings than forewing.

Abdomen brown, each pregenital segment dorsally dark brown. Tergum 9 in dorsal view with an arcuate incision, a nearly U-shaped posterior incision and a dorsoprocessus, leaving a pair of hemitergites, which are obtuse distally and densely setose; dorsoprocessus subtriangular, almost membranous (Fig. 4 C, I View Figure 4 ). Sternum 9 nearly subtrapezoidal, only one third in length of tergum 9, convex posteriad (Fig. 4 J, K View Figure 4 ). Ectoproct in dorsal view nearly trapezoidal, with an arcuate anterior incision; posterodorsally with three sclerotised, tiny teeth at middle (Fig. 4 C, I View Figure 4 ), posteroventrally with a bifid digitiform projection and a pair of bifid unguiform projections (Fig. 4 I, M View Figure 4 ). Gonocoxite 9 nearly trapezoidal in dorsal view, anteriorly with a rounded lobe strongly curved ventrally along lateral margin, posteriorly with a pointed lateral projection and an elongate, spinous medial projection curved ventrally (Fig. 4 C, I, L View Figure 4 ). Gonocoxite 10 slender elongate, almost twice as long as gonocoxite 9, anterior half weakly sclerotised, with pointed base, medially swollen and rounded, distally strongly sclerotised, with a blade-like projection (Fig. 4 D, J View Figure 4 ). Fused gonocoxites 11 nearly beam-shaped, laterally slightly extended, connecting to bases of gonocoxite 9 (Fig. 4 C, I View Figure 4 ). Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate (Fig. 4 D, J View Figure 4 ).

Female. Body length 11.0 mm; forewing length 16.6 mm, hindwing length 14.0 mm.

Wings with markings much darker than those in male (Fig. 4 B View Figure 4 ).

Sternum 7 in lateral view nearly rectangular, in ventral view nearly trapezoidal, with posterior margin slightly concave at middle. Segment 8 ventrally without subgenitale (Fig. 4 H, O View Figure 4 ). Tergum 9 in lateral view as wide as tergum 8 (Fig. 4 G, N View Figure 4 ). Bursa copulatrix with colleterial gland tubular, extended to segment 7; basal part of bursa copulatrix like a round sac, in lateral view anteriorly strongly sclerotised (Fig. 4 G, N View Figure 4 ), in ventral view like a rounded sclerite posteriorly with a pair of smaller, ovoid projections (Fig. 4 H, O View Figure 4 ); bursal accessory gland not observed. Ectoproct small, ovoid (Fig. 4 G, N View Figure 4 ).

Materials examined.

Holotype ♂, China • Chongqing Province, Guangyangwulipo Nature Reserve [官阳五里坡自然保护区], 31.3733°N, 109.9289°E, 1834 m alt., 22–23. VI. 2021, Lulan Jie ( CAU) GoogleMaps . Paratypes • 1 ♀ 9 ♂, same data as holotype ( CAU) GoogleMaps .

Etymology.

The species is dedicated to Ms. Lulan Jie, who is a friend of the first author and collected the type specimens.

Distribution.

China ( Chongqing).

Remarks.

This is the first record of the species from Chongqing Province in China. The new species D. lulanae sp. nov. is possibly a member of the D. guangxiensis species-group based on the presence of the dorsoprocessus of male tergum 9 (Fig. 4 C, I View Figure 4 ). However, in the D. guangxiensis species-group, the male gonocoxite 10 generally protrudeg a pointy lobe connecting to gonocoxite 9 submedially ( Zhang et al. 2015). In D. lulanae sp. nov., the male gonocoxite 10 is swollen and rounded medially (Fig. 4 D, J View Figure 4 ). Furthermore, the new species can be distinguished from other members of the D. guangxiensis species-group by the short male gonocoxite 9, which is only half length of gonocoxite 10 (Fig. 4 D, J View Figure 4 ). In all the other members of the D. guangxiensis species-group, the male gonocoxite 9 is much longer or almost same length of gonocoxite 10 ( Zhang et al. 2015).