Osmylus trituberatus Li, Zheng, Wang and Liu, 2025

Li, Zechuan, Zheng, Yuchen, Wang, Yongjie & Liu, Xingyue, 2025, A revision of the Osmylus hyalinatus species group (Neuroptera: Osmylidae), with description of seven new species, Journal of Natural History 59 (13 - 16), pp. 849-893 : 874-875

Osmylus trituberatus Li, Zheng, Wang and Liu sp. n.

LSID: urn:lsid:zoobank.org:act:

( Figures 8 , 14N )

Diagnosis

Head yellowish brown to dark brown; vertex dark brown, anteriorly with a pale transversal band. Pronotum brown with some irregularly shaped dark brown markings. Fore wing gradate series area to apex with several dots, arranged along out gradate series; distal MP and Cu area with brown dots. Male tergum 9 with a long triangular process, 1.6 times as long as wide in lateral view. Male gonocoxites 9 with two pairs of digitiform tubercles, close in size and almost parallel, and a pair of subtriangular tubercles; close to anterior pair with a subtriangular tubercle; in ventral view posterior margin with a deep U-shaped concavity; ectoproct subtriangular in lateral view. Female sternum 7 posteriorly with an indistinct process; anterior branch of tergum 9 very short; in ventral view anterior angle of gonocoxite 9 rounded.

Description

Head width 2.8 mm; fore wing length 31.7 mm; hind wing length 26.2 mm.

Head. ( Figure 8C ) Yellowish brown to dark brown. Vertex dark brown, anteriorly with a pale transversal band, hairless. Ocelli distinct, forming a sagittal dark brown marking with yellowish-brown long setae. Scape dark brown, pedicel black; flagellum black, filiform. Frons yellowish brown. Clypeus yellowish brown, lateral margin with a pair of dark dots, covered with some yellowish-brown setae. Labrum with white markings. Mandible basally brown, distally dark brown.

Thorax. ( Figure 8B ) Pronotum dark brown with some irregularly shaped dark markings. Meso- and metanotum brown with some dark markings, covered with many dark setae. Legs. Long and slender, yellow, protibiae dark along outer margin, covered with short setae. Tibia nearly twice as long as femur, tarsomere 1 relatively longer, nearly as long as entire length of tarsomeres 2–4; pretarsal claws curved. Metatibia longer than that of fore- and midlegs.

Wings. Ovoid, hyaline, with dense setae. Pterostigma dark brown alternating with pale. Fore wing gradate series area to apex with several dots, arranged along out gradate series; distal MP and Cu area with brown dots; costal space broad basally, subcostal veinlets basally connected by some short oblique crossveins; RP with 16 branches; RP1 originating near origin of RP, M fork close to origin of RP1; two distinct gradate series present; CuP with numerous crossveins; A1 and A2, with pectinate branches and crossveins. Hind wing subcostal veinlets without interlinked crossvein; apex with a dark dot, outer gradate series with a dark dot.

Abdomen. Dark brown, covered with yellowish-brown setae. Male genitalia ( Figure 8D, E ). Tergum 8 long, scent gland relatively large and ovoid. Tergum 9 with a long triangular process, 1.6 times as long as wide in lateral view. Gonocoxites 9 with two pairs of digitiform tubercles, close in size and almost parallel, and a pair of subtriangular tubercles; close to anterior pair with a subtriangular tubercle; in ventral view posterior margin forms a deep U-shaped concavity; gonocoxites 10 weakly sclerotised, almost transparent; ectoproct subtriangular in lateral view. Female genitalia ( Figure 8F, G ). Sternum 7 with an indistinct process; gonocoxite 8 small, curved dorsad. Anterior branch of tergum 9 very short; in ventral view gonocoxite 9 as a slender fusiform structure, with anterior angle rounded. Ectoproct subtriangular in lateral view. Spermatheca elongated and ovoid ( Figure 14N ).

Type material

Holotype ♂, CHINA: Sichuan, Baoxing [宝兴市], Dengchigou [邓池沟], 1600 m, 1 August 2016, leg. Yan Li ( CAU) . Paratypes: CHINA: 2♀, Yunnan, Honghe [红河], Pingbian [屏边], Dawei Mountain, 10 May 2021 ( CAU).

Distribution

China ( Sichuan, Yunnan) .

Etymology

The specific name refers to three tubercles are visible in lateral view of male gonocoxites 9.

Remarks

This new species is closely related to O. atomatus morphologically, but it can be easily distinguished by the genital characters. In O. atomatus , the tubercles of male gonocoxites 9 are closely positioned in lateral view; the female sternum 7 is distinguished by two processes, the anterior branch of female tergum 9 is elongated, and the anterior angle of female gonocoxite 9 is triangular in ventral view. However, in O. trituberatus sp. n., the tubercles of male gonocoxites 9 are more widely spaced; the female sternum 7 possesses an indistinct process, the anterior branch of female tergum 9 is notably short, and the anterior angle of female gonocoxite 9 is rounded in ventral view.

Figures

Figure 8. Osmylus trituberatus Li, Zheng, Wang and Liu sp. n. A. habitus; B. head and thorax, dorsal view; C. head; D. male genitalia, lateral view; E. male genitalia, ventral view; F. female genitalia, lateral view; G. female genitalia, ventral view. Scale bars: A = 10.0 mm; B = 2.0 mm; C = 1.0 mm; D–G = 0.5 mm.

Figure 14. Male gonocoxites 10 and female spermatheca. A, J. O. atomatus; B, K. O. decoratus; C, L. O. flaviantennatus sp. n.; D, M. O. gaoligongensis sp. n.; E. O. verticalis sp. n.; N. O. trituberatus sp. n.; F. O. wenii sp. n.; G, O. O. xiaohongae sp. n.; H, P. O. qinlinganus sp. n.; I, Q. O. zheanus.