Vietnamodes unicispina Qi et Li, 2020

Vietnamodes unicispina Qi et Li , sp. nov.

( Figs 6 View FIGURES 4–6 , 9 View FIGURES 7–9 , 12 View FIGURES 10–12 )

Type material. China, Guangxi Zhuang Autonomous Region: Holotype, ♂, Jiuniutang Management Station ( 25.88°N, 110.49°E), Mt. Maoer , Guilin City, 1016 m, 24.VII.2015, leg. Mujie Qi, Shengnan Zhao, genitalia slide No. QMJ17030. GoogleMaps

Paratypes: 1 ♂, 3 ♀♀, same data as holotype except 25.VII.2015, genitalia slide Nos. QMJ15270 GoogleMaps ♀, QMJ15271 ♀; Hubei : 2 ♂♂, Houhe, Wufeng , 1100 m, 10–11.VII.1999, leg. Houhun Li et al., genitalia slide No. QMJ18044 ; 1 ♂, Songbai Town, Shennongjia Nature Reserves , 1200–1400 m, 15.VII.2003, leg. Shulian Hao ; 1 ♂, Bajiao Temple, Shennongjia Nature Reserves , 1100 m, 19.VII.2003, leg. Shulian Hao, genitalia slide No. QMJ18047 ; Shaanxi: 1 ♂, 3 ♀♀, Haoping Temple ( 34.05°N, 107.42°E), Yingtou Town , 1251 m, 18.VII.2012, leg. Jinwei Li, genitalia slide Nos. QMJ18045 GoogleMaps ♂, QMJ18061 ♀; 7 ♂♂, Taochuan Town ( 34.03°N, 107.32°E), Taibai County, 1157 m, 25. VI.2016, leg. Hao Wei, Shuaishuai Wu, genitalia slide No. QMJ18046 GoogleMaps ; Shanxi: 1 ♂, Xizhashui Village, Lingchuan Town , 12.VII.2010, leg. Haiyan Bai, Linlin Yang, genitalia slide No. QMJ18048 .

Diagnosis. This species is most similar to V. adelinae Leraut, 2017 superficially, but it can be distinguished from the latter by the antemedial line of the forewing bordered by a reddish brown line mixed with fuscous scales posteriorly, the cilia of forewing brownish purple and by the ovate uncus and the apex of the sacculus with a long and strong thorn in the male genitalia. In V. adelinae , the antemedial line of the forewing is not bordered by a reddish brown line, the cilia of forewing is yellowish brown except reddish brown near apex, and the uncus is rhombic and the apex of the sacculus is with a lobe-shaped distal extension, and with a cluster of thorns dorsally in the male genitalia.

Description. Adult ( Fig. 6 View FIGURES 4–6 ). Wingspan 14.0–18.0 mm in male and 17.5–19.0 mm in female. Frons and vertex covered with reddish brown scales. Labial palpus reddish brown mixed with fuscous; first segment as long as third, each about 1/2 length of second; second segment upturned. Maxillary palpus brown, slightly shorter than third segment of labial palpus. Antenna dorsally reddish brown, with scape elongated, about 3 times as long as pedicel. Patagium and tegula pale reddish brown. Forewing pale yellowish brown, basal area slightly suffused with brownish purple scales along dorsum; terminal area brownish purple mixed with fuscous scales; costal margin interrupted by pale brown spots except for terminal area; antemedial line pale yellowish white, from basal 1/4 of costa arched outward to basal 1/4 of dorsum, bordered by a reddish brown mixed with fuscous line on outer side posteriorly; postmedial line concolorous with antemedial line, from distal 1/5 of costa arched inward to distal 1/8 of dorsum; distal discoidal stigma fuscous; cilia brownish purple except for fuscous tip of scales at apex. Hindwing grayish brown mixed with fuscous scales except for basal area more darker; antemedial line pale gray, edged with brownish purple line on outer side; postmedial line pale gray; cilia pale gray except brownish purple at base and fuscous at tip near apex. Foreleg reddish brown except brown at apex of each tarsomere; mid- and hindlegs yellow, slightly mixed with brown scales on each femur.

Male genitalia ( Fig. 9 View FIGURES 7–9 ) Uncus ovate, setose dorsally on distal 3/4, rounded at apex. Gnathos with lateral arm bandlike, joined at midlength, distal process bulged medially, hooked at apex, about as long as uncus. Valva medially with basal 1/3 smooth, distal 2/3 hairy, ventral margin distinctly convex medially; sacculus about 1/3 length of valva, gradually narrowed towards apex, with a strong thorn projecting inward from its apex, about 2/5 length of sacculus, surrounded by several strong setae. Juxta oval, deeply cleft posteriorly. Vinculum triangular. Phallus with basal part about 2 times as long as distal part, cornuti composed of a cluster of minute thorns.

Female genitalia ( Fig. 12 View FIGURES 10–12 ) Papillae anales triangular, rounded at apex. Apophyses posteriores curved at posterior 1/4, slightly dilated at apex, about 1.3 times as long as apophyses anteriores. Antrum funnel-shaped, colliculum membranous, about twice as long as antrum. Ductus bursae broadened at posterior 1/4, almost granular on inner surface. Corpus bursae elongated, as long as ductus bursae.

Distribution. China ( Guangxi, Hubei, Shaanxi, Shanxi).

Etymology. The specific name is derived from the Latin unicus (single) and spina (thorn), in reference to the single thorn at the apex of the sacculus in the male genitalia.