Dilar lanlingensis, Li & Liu, 2025

Dilar lanlingensis sp. nov.

Figs 1 View Figure 1 , 3 Common name. 兰陵栉角蛉 View Figure 3

Diagnosis.

The new species is characterised by the forewing with densely transverse arcuate stripes, which is darker on the proximal half and costal region (Fig. 3 A View Figure 3 ) and by the male ectoproct posterodorsally with a strong sclerotised projection medially, which is bifid at tip (Fig. 3 B, F View Figure 3 ), by the male gonocoxite 9 with posterior half not incurved in dorsal view (Fig. 3 B View Figure 3 ) and by the male fused gonocoxites 11 bifurcated on both ends (Fig. 3 B, F View Figure 3 ).

Description.

Male. Body length 6.5 mm; forewing length 10.1 mm, hindwing length 8.9 mm.

Head generally pale brown, with yellow setose tubercles, tubercles surrounded by dark brown markings; vertex brown; region between the antennae distinctly darker. Compound eyes blackish-brown. Antenna generally brown, pedicellus pale yellow; flagellum pectinate, medial branches longer than those branches at base, longest branch nearly 4.0 times as long as corresponding flagellomere, distal seven flagellomeres simple.

Thorax brown; pronotum with a pair of pale brown ovoid tubercles at middle; mesonotum darker along anterior, posterior and lateral margins, submedially with paired pale semi-lunar-like markings; metanotum much paler than mesonotum, with posterior margin much darker. Legs generally pale brown, femora, tibiae and each tarsomere dark brown at tip. Wings pale brown (Fig. 3 A View Figure 3 ). Forewing 2.1 times as long as wide, with many transversely arcuate stripes, markings darker on the proximal half, costal and subcostal region; 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. Tergum 9 in dorsal view with an arcuate incision and a nearly V-shaped posterior incision, leaving a pair of subtriangular hemitergites, which are obtuse distally and densely setose; the posteromedian region of tergum 9 slightly convex, with a longitudinal sclerotised area present at the median. Sternum 9 subtriangular, approximately one third in length of tergum 9 (Fig. 3 G, H View Figure 3 ). Ectoproct longitudinally elongated, with a deeply arcuate anterior incision; posterodorsally with a digitiform projection, which is bifid at tip (Fig. 3 B, F View Figure 3 ), posteroventrally with a pair of bifid, unguiform projections (Fig. 3 I View Figure 3 ). Gonocoxite 9 with anterior half broadly spoon-shaped, with posterior half slender elongate and curved posteroventrally (Fig. 3 B, F View Figure 3 ); Gonocoxite 10 slender elongate, much longer gonocoxite 9, with incurved base and spinous tip, posterodorsally directed, medially with a robust lobe connecting to ninth gonocoxite (Fig. 3 C, G View Figure 3 ). Fused gonocoxites 11 nearly beam-shaped, laterally bifurcated and angularly posteriorly curved, connecting to bases of gonocoxite 9 (Fig. 3 B, F View Figure 3 ). Hypandrium internum large, nearly trapezoidal, with lateral margins slightly arcuate (Fig. 3 C, G View Figure 3 ).

Material examined.

Holotype ♂, China • Jiangsu Province, Changzhou, Mt. Jintanmaoshan [常州金坛茅山], 18. V. 2024, Tiangjiao Wang & Zhe Yu ( CAU) .

Etymology.

The species name refers to the type locality, Changzhou, Jiangsu Province, China. In ancient times, this region was part of the Lanling Commandery [兰陵郡], established during the Southern and Northern Dynasties (circa 502 AD). The administrative centre of Lanling Commandery was located within the present boundaries of modern Changzhou. Over time, the name “ Lanling ” was gradually replaced by “ Changzhou ” due to changes in administrative divisions, but the historical name remains significant. The specific epithet honours this ancient connection to Lanling, where the type specimen was collected.

Distribution.

China ( Jiangsu).

Remarks.

The new species belongs to the D. hastatus species-group by the male gonocoxite 9 generally with inflated proximal half and unguiform or 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.

Concerning the species of the D. hastatus species-group, the new species appears to be closely related to the species distributed in East Asia, such as D. japonicus McLachlan, 1883 , D. septentrionalis , D. taiwanensis and D. tianmuanus , in having similar male genital characters, for example, the presence of posterodorsal digitiform projection of male ectoproct, the male gonocoxite 9 with spoon-shaped proximal half and the male fused gonocoxites 11 generally laterally bifurcated at the end. However, D. lanlingensis sp. nov. can be distinguished from the other species by the distinctly bifid, posterodorsal digitiform projection of the ectoproct (Fig. 3 B, F View Figure 3 ) and the male gonocoxite 9 directed posteroventrally, not incurved in dorsal view (Fig. 3 B, F View Figure 3 ). In the other East Asian species of the D. hastatus species-group, the digitiform posterodorsal projection of the male ectoproct is serrated or convex, not distinctly bifurcated and the male gonocoxite 9 is generally strongly incurved in dorsal view ( Zhang et al. 2014 c, 2015).