Osmylus angustimarginatus, Xu, Han, Wang, Yongjie & Liu, Zhiqi, 2016

Xu, Han, Wang, Yongjie & Liu, Zhiqi, 2016, Three new species of Osmylus Latreille from China (Neuroptera, Osmylidae), ZooKeys 589, pp. 107-121 : 117-119

Taxon classification Animalia Neuroptera Osmylidae

Osmylus angustimarginatus sp. n. Figs 8, 9

Material examined.

Holotype Male. CHINA: Chongqing: Jiangjin (District): Simianshan (mountain), [28°38'N, 106°24'E] 17.vi.2006, leg. Weiwei Zhang. Verbatim label data (translated from Chinese): CHINA: Chongqing, Jiangjin, Simianshan/ 17.vi.2006/ Weiwei Zhang/ PC. Terminalia cleared in KOH, and stored in a micro-vial pinned below the specimen. Paratype. 1 female, same data as holotype; 1 male, 1 female, same locality as holotype. 21-23.ix.2007, leg. Weiwei Zhang.

Diagnosis.

Male: 9th with a finger-like dorsal process. Gonarcus distally triangular in lateral view, ventral margin well sclerotized; base of mediuncus slightly protuberant distally in lateral view. Female: gonapophysis lateralis finger-like; spermatheca approximately spherical.

Description.

Head. Vertex yellow brown, with dark brown setae; ocelli light yellow, area comprised among ocelli dark brown; eyes gray with metallic reflection; frons black. Thorax. Pronotum dark brown, with yellow setae; meso- and metanotum fuscous, with black stripes. Legs yellow, with short setae, pretarsal claws dark brown.

Wings (Fig. 8). Forewing length 27-29 mm, width 8-9 mm. Wings elongated; membrane hyaline, with numerous brown spots; pterostigma brown, nygmata light brown; veins dark brown, some edged with dark brown spots; Rs with 13-14 branches; cross-veins are present among branches of CuP. Hindwing length 25-26 mm, width 7-8 mm; membrane hyaline; pterostigma light brown.

Male Terminalia (Fig. 9 a–e). Scent glands stout. 9th tergite wide, with a finger-like process; 9th sternite approximately rectangular in lateral view; ectoproct small, callus cerci round; gonarcus distally well sclerotized and triangular in lateral view, ventral margin well sclerotized; anterior arm of gonarcus slender and basally dilated; mediuncus slightly finger-like at base, more slender apically in lateral view; rod-shaped paramere beneath the mediuncus slightly bent in lateral view.

Female Terminalia (Fig. 9 f–h). 8th sternite approximately square in lateral view. 9th tergite narrow; ectoproct conical, callus cerci round; gonapophysis lateralis long and finger-like, with a long conical stylus; spermatheca approximately spherical.

Distribution.

Known only from Chongqing, China.

Etymology.

The specific name ‘angustimarginatus’ the compound of Latin deribation, from angusti- (narrow) and marginatus- (margin), refers to the well sclerotized ventral margin of the gonarcus in lateral view.

Remarks.

The dorsal process of 9th tergite in the male of Osmylus angustimarginatus sp. n. is finger-like (Fig. 9a), closely resembling the condition observed in Osmylus maoershanicola sp. n. However, the ventral margin of the gonarcus of Osmylus angustimarginatus sp. n. is well sclerotized (Fig. 9b), clearly differentiating it from Osmylus maoershanicola sp. n. Moreover, female gonapophysis lateralis of Osmylus angustimarginatus sp. n. is more slender in comparison with the fusiform gonapophysis lateralis of Osmylus maoershanicola sp. n. (Fig. 5f).