Dilar tuyuezhengi, Li & Liu, 2025

Dilar tuyuezhengi sp. nov.

Fig. 7 Common name. 涂粤峥栉角蛉 View Figure 7

Diagnosis.

The new species is characterised by the forewing intensively spotted, with marginal markings largely continuous which are covering along the edge of the whole forewing (Fig. 7 A, B View Figure 7 ), by bifurcated male gonocoxite 9, with a spinous inner projection and a relatively longer, unguiform outer projection (Fig. 7 D, I View Figure 7 ) and by the slender elongate male gonocoxite 10 submedially expanding laterally and forming a narrow rectangular lobe (Fig. 7 D, J View Figure 7 ).

Description.

Male. Body length 5.4 mm; forewing length 7.2 mm, hindwing length 6.4 mm.

Head generally brown, with dark brown setose tubercles; vertex pale brown. Compound eyes blackish-brown. Antenna generally brown, flagellum pale brown, with distal margin of each flagellomere distinctly dark; flagellum pectinate, medial branches longer than those branches at base, longest branch nearly 4.0 times as long as corresponding flagellomere, distal six flagellomeres simple.

Thorax dark brown; pronotum with a pair of yellow ovoid tubercles at middle; mesonotum dark brown at middle, as well as along anterior and lateral margins, submedially with a pair of yellowish semi-lunar-like markings; metanotum much paler than mesonotum. Legs pale brown, femora, tibiae and each tarsomere dark brown at tip. Wings smoky brown (Fig. 7 A View Figure 7 ). Forewing 2.3 times as long as wide, with many brown transverse stripes across entire wing which are notably darker on base and subcostal region; marginal markings largely continuous, forming a band that runs along the edge of the whole forewing; three and two nygmata, respectively present on left and right forewing, at base and middle, nygmata respectively surrounded by a pale brown spot; longitudinal veins pale yellow, interrupted by many brown spots; crossveins pale brown. Hindwing 2.2 times as long as wide, almost immaculate.

Abdomen brown. Tergum 9 in dorsal view with a deeply posterior incision, leaving a pair of hemitergites, which are obtuse distally and densely setose; the posteromedian region of tergum 9 slightly convex. Sternum 9 subtriangular, only one third in length of tergum 9, almost convex posteriad (Fig. 7 D, J View Figure 7 ). Ectoproct in dorsal view nearly trapezoidal, anteriorly with an arcuate incision; posterodorsally with an abrupt incision, a pair of obtuse projections and a pair of slender elongate spine-like projections (Fig. 7 C, I View Figure 7 ); posteroventrally with a pair of a pair of bifid unguiform projections laterally and a pair of digitiform projections at the middle (Fig. 7 J, L View Figure 7 ). Gonocoxite 9 slightly flattened on proximal half, lateral margin expanding ventrally, distal half bifurcated, with one relatively shorter, spinous inner projection directed posteriorly and one slightly longer, unguiform outer projection directed posteroventrally (Fig. 7 C, I View Figure 7 ). Gonocoxite 10 slender elongate, almost twice as long as gonocoxite 9, with hook-like base and spinous tip, submedially with lateral margin slightly expanding dorsolaterally and forming a narrow rectangular lobe (Fig. 7 D, J View Figure 7 ). Fused gonocoxites 11 nearly beam-shaped, anteriorly convex, laterally slightly expanded, connecting to bases of gonocoxites 9 (Fig. 7 C, I View Figure 7 ). Hypandrium internum nearly trapezoidal, with lateral margins slightly arcuate (Fig. 7 D, J View Figure 7 ).

Female. Body length 6.5 mm; forewing length 11.2 mm, hindwing length 9.2 mm.

Wings with markings slightly darker, but seemingly not as dense as those in male, a relatively immaculate area distad to the median nygma (Fig. 7 B View Figure 7 ).

Sternum 7 in lateral view nearly rectangular, in ventral view nearly rectangular, with posterior margin almost truncate. Segment 8 ventrally with a subtriangular, membranous structure, which is convex posteriorly, putative as subgenitale (Fig. 7 O View Figure 7 ). Tergum 9 in lateral view as wide as tergum 8 (Fig. 7 G, N View Figure 7 ). Bursa copulatrix with colleterial gland tubular, extended to segment 7. Bursa copulatrix in lateral view present as two tightly-connected parts, with the anterior one as a curved lobe and the posterior one broadly sac-like, distally curved ventrally (Fig. 7 G, N View Figure 7 ) and in ventral view, present as an anteriorly strongly-sclerotised ovoid plate, medially bearing a pair of digitiform projections (Fig. 7 H, O View Figure 7 ). Bursal accessory gland not observed. Ectoproct small, ovoid (Fig. 7 G, N View Figure 7 ).

Materials examined.

Holotype ♂, China • Yunnan Province, Yiliang, Xiaocaoba Reserve [彝良县小草坝保护区], 1800–2000 m alt., 20. VII. 2023, Yuezheng Tu ( CAU) . Paratype • 1 ♀, same data as holotype ( CAU) .

Etymology.

The species is dedicated to Mr. Yuezheng Tu, who is a friend of the first author and collected the type specimens.

Distribution.

China ( Yunnan).

Remarks.

The new species should be a member of the D. hastatus species-group, based on the male gonocoxite 9 generally with inflated proximal half and bifid tip, the slender elongate male gonocoxite 10, which is generally much longer than gonocoxite 9 and by the slender beam-shaped male fused gonocoxites 11, which is generally expanded on both ends. Amongst all known species of the D. hastatus species-group, the new species resembles D. bifurcatus , in having similar external appearance and male genital characters, such as the forewing intensively spotted with continuous marginal markings, the male gonocoxite 9 bifurcated on distal half, the slender elongate male gonocoxite 10 with hook-like base. However, the new species can be distinguished from the latter by the male ectoproct posterodorsally with a pair of obtuse projections and a pair of spine-like projections (Fig. 7 C, I, L View Figure 7 ) and the male gonocoxite 10 submedially with lateral margin slightly expanding, forming a narrow rectangular lobe (Fig. 7 D, J View Figure 7 ). In D. bifurcatus , the male ectoproct posterodorsally has no projections and the male gonocoxite 10 are not expanded along lateral margin ( Zhang et al. 2015: fig. 21).