Osmylus flaviantennatus 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 : 864-866

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

LSID: urn:lsid:zoobank.org:act:C441EE8D-8147-4D66-9650-2EBEC3ABBEC3

( Figures 1 , 5 , 14C, L )

Diagnosis

Head yellow to brown; vertex dark brown, anteriorly with a pale transversal band; antennae yellow. Pronotum brown with some irregularly shaped dark brown markings. Fore wing with some indistinct brownish bands ( Figure 1F ); gradate series area to apex with several dots, arranged along outer gradate series; distal MP and Cu area with brown dots. Male tergum 9 with a triangular process, 1.3 times as long as wide in lateral view; gonocoxites 9 with two pairs of tubercles, posterior pair triangular, anterior pair digitiform, posterior margin forms a V-shaped concavity in ventral view; gonocoxites 10 curved arcuately. Female sternum 7 posteriorly with a pair of processes; in ventral view gonocoxite 9 fused as a slender fusiform structure, with anterior angle rounded. Spermatheca simple and rounded.

Description

Head width 2.1 mm; fore wing length 22.5 mm; hind wing length 19.4 mm.

Head. ( Figure 5C ) Yellow to brown. Vertex dark brown, anteriorly with a pale transversal band, hairless. Ocelli distinct, relatively small, between antennae with a dark rhombic marking. Scape, pedicel and flagellum yellow, filiform. Frons and clypeus yellow, lateral margin with a pair of dark dots, covered with some yellowish-brown setae. Labrum yellow. Mandibles basally brown, distally dark brown.

Thorax. ( Figure 5B ) Totally brown, with some irregularly shaped dark brown markings, covered with many brown setae.

Legs. Long and slender, yellow, 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. Pterostigma dark brown alternating with pale. Fore wing outer gradate series area to apex and distal part of M and Cu area with several transversely arranged dots, dots at outer gradate series large; costal space broad basally, subcostal veinlets basally connected by some short oblique crossveins; RP with 14–15 branches; RP1 originating near origin of RP, M fork close to origin of RP1; RP with two distinct gradate series, CuP with numerous crossveins; A1 and A2, with pectinate branches and crossveins. Hind wing subcostal veinlets without interlinked crossvein; apex with a dark dot.

Abdomen. Dark brown, covered with yellowish-brown setae. Male genitalia ( Figure 5D, E ): Tergum 8 long; callus cerci relatively larger and ovoid. Tergum 9 with a triangular process, 1.3 times as long as wide in lateral view. Gonocoxites 9 slightly sclerotised distally, with two pairs of tubercles, posterior pair triangular, anterior pair digitiform, posterior margin forms a V-shaped concavity in ventral view; gonocoxites 10 ( Figure 14C ) curved roundly. Female genitalia ( Figure 5F, G ): Sternum 7 posteriorly with a pair of processes; gonocoxite 8 small. Tergum 9 branched ventrad; anterior branch scoop-shaped in ventral view. Gonocoxite 9 in ventral view as a slender fusiform structure, anterior angle rounded. Ectoproct subtriangular in lateral view. Spermatheca simple and rounded ( Figure 14L ).

Type material

Holotype ♂, CHINA: Xizang, Shigatse, Nyalam, Zhangmu Town [樟木镇], leg. Yuezheng Tu ( CAU) . Paratype: CHINA: 1♀, Xizang, Shigatse, Nyalam, Zhangmu Town [樟木镇], Yingbing Road [迎宾路], 29 July 2020, 1900 m, leg . Yuchen Zheng ( CAU); 2♀, Xizang, Shigatse, Nyalam , Zhangmu Town [樟木镇], 10 July 2023, 2239 m, leg . Xinglong Bai and Quanyu Ji ( MHBU).

Distribution

China (Xizang).

Etymology

This new species is named after its unique yellow antennae.

Remarks

This new species can be easily distinguished by the yellow antennae, while all the other species in the Osmylus hyalinatus group have black or dark brown antennae.

Figures

Figure 1. Living adults and their type localities.A. Osmylus gaoligongensis Zheng,Li, Wang and Liu sp. n., living adult. B. Type locality of O. gaoligongensis sp. n., Pianma (Yunnan). C. O. xiaohongae Zheng, Li, Wang and Liu sp. n., living adult.D. Type locality of O. xiaohongae sp. n., Dehua (Fujian).E. Microhabitat of O. xiaohongae sp. n. from its type locality. F. O. flaviantennatus Li, Zheng, Wang and Liu sp. n., living adult. G. Type locality of O. flaviantennatus sp. n., Zhangmu (Xizang). Photos by Yuchen Zheng.

Figure 5. Osmylus flaviantennatus Li, Zheng, Wang and Liu sp. n. A. habitus; B. head and thorax, dorsal view; C. head; D. male, lateral view; E. male genitalia, ventral view; F. female genitalia, lateral view; G. female, 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.