Ourapteryx angusta, Cheng & Wen & Han, 2025

Cheng, Rui, Wen, Boxin & Han, Hongxiang, 2025, Six new cryptic species of Ourapteryx Leach (Geometridae: Ennominae) from Asia, Zootaxa 5722 (4), pp. 543-554 : 547-549

Ourapteryx angusta sp. nov.

Corresponding to sp 2 in Cheng et al. (2025b).

Chinese common name: Ḟƪkš

( Figs 3–4 , 31–32 )

Material examined. Holotype, ♂, China: Xizang ( Tibet, IZCAS): Cona, Mama , 18–20.VI. 2015, 2930 m, leg. Xinxin LI, slide no. Geom-3248, IOZ LEP M 18520 . Paratypes. China: Xizang ( IZCAS): 3♂, Cona, Lexiang, Senmuzha , 2741 m, 2–3.VI.2016, leg. Xinxin LI, IOZ LEP M 20440, 20434, 20466 . Bhutan ( ZSM): 2♂, Trongsa dzongkhag, road Trongsa to Yotong La , 5km NE Trongsa, 3040 m, 19.VI.2007, leg. Kautt & Naumann, BC ZSM Lep 26869, BC ZSM Lep 62429 .

Diagnosis. Discussed in next new species account.

Description ( Figs 3–4 ). Head. Antennae greyish brown with 13–15 basal segments white dorsally. Frons blackish brown on upper one third, the remainder white. Labial palpus dark yellowish brown, suffused with white scales apically and ventrally. Vertex white.

Thorax. Patagia, tegulae and thorax white. Legs white, suffused with black scales inside fore- and median legs, black patches present between femora and tibia of fore- and median legs, hind tibia dilated in male, with hair-pencil, both sexes with two pairs of spurs. Wing s. Ground colour yellowish white. Forewing length: ♂ 22–23 mm. Forewing densely diffused with pale grey striation between antemedial and postmedial lines and near submarginal area; short blackish grey streaks present on costa; antemedial and postmedial lines obliquely straight, grey, suffused with yellowish brown scales, the former nearer to the latter on inner margin than on costa; discal spot linear and greyish brown; terminal line black, invisible near apex and anal angle; fringes mostly yellowish brown, white near apex and anal angle. Outer margin almost straight except at apex and anal angle which is slightly curved. Hind wing with medial line straight, greyish brown, not extending to costa and anal margin; pale grey striation present near submarginal area; terminal line black, invisible near anal angle; outer margin decorated with very small tail with acute tip and strong shoulder, tail bearing an indistinct dark red streak at base, covered by a blackish grey band inside; fringes mostly reddish brown, white near anal angle. Underside. Wings white, transverse lines faintly indicated. In forewing venation, veins R 1 and R 2 coincident.

Abdomen. Abdomen white, males with setal comb on third sternite.

Male genitalia ( Figs 31–32 ). Uncus short and stout, rounded at apex, length slightly shorter than basal width. Socii small and membranous. Gnathos with median process small and rounded. Valva simple, rounded apically; costa straight. Furca developed on right side, short and very stout, not reaching median process of gnathos, straight, with a row of stout thorns interiorly all its length. Saccus rounded and short. Aedeagus cylindrical; vesica with an elongate group of stout spines of differing length.

Female genitalia. Unknown.

Distribution. China ( Xizang), Bhutan.

Etymology. The specific name is derived from the Latin adjective angustus, which means ‘narrow’ or ‘restricted,’ referring to its narrow hind wing tail.

Figures

FIGURES 1–20. Upperside and underside adults of Ourapteryx. 1–2, O. mediofurca sp. nov., male, holotype, Yunnan, China; 3–4, O. angusta sp. nov., male, holotype, Xizang, China; 5–6, O. parainouei sp. nov., male, holotype, Vietnam; 7–8, O. inouei, male, holotype, Ganesh Himalaya, Nepal; 9–12, O. tachengensis sp. nov., 9–10, male, holotype, Tacheng, Yunnan, China, 11– 12, female, paratype, data same as Holotype; 13–16, O. qinlingensis sp. nov., 13–14, male, holotype, Qinling, Shaanxi, China, 15–16, female, paratype, Qinling, Shaanxi, China; 17–18, O. pallidula, male, holotype, Taiwan, China; 19–20, O. pallidula, male, Yunnan, China, IOZ LEP M 16627.

FIGURES 29–44. Male genitalia and aedeagus of Ourapteryx. 29–30, O. mediofurca sp. nov., holotype, IZCAS slide no. Geom-3132; 31–32, O. angusta sp. nov., holotype, IZCAS slide no. Geom-3248; 33–34, O. parainouei sp. nov., holotype, IZCAS slide no. Geom-7206; 35–36, O. inouei, holotype, ZFMK; 37–38, O. tachengensis sp. nov., holotype, IZCAS slide no. Geom-2882; 39–40, O. qinlingensis sp. nov., holotype, IZCAS slide no. Geom-2939; 41–44, O. pallidula, 41–42, holotype, BMNH slide no. 11287, 43–44, IZCAS slide no. Geom-2884.