Vietnamodes unicispina Qi et Li, 2020

Qi, Mujie & Li, Houhun, 2020, Genus Vietnamodes Leraut, 2017 (Lepidoptera, Pyralidae) new to China, with description of a new species, Zootaxa 4803 (1), pp. 190-196 : 193-196

Vietnamodes unicispina Qi et Li , sp. nov.

( Figs 6 , 9 , 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.

Paratypes: 1 ♂, 3 ♀♀, same data as holotype except 25.VII.2015, genitalia slide Nos. QMJ15270 ♀, 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 ♂, 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 ; 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 ). 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 ) 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 ) 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.

Figures

FIGURES 4–6. Adults of Vietnamodes spp. 4. V. adelinae, ♂; 5. V. dogueti, ♂; 6. V. unicispina sp. nov., holotype, ♂. (Scale bars: 5.0 mm)

FIGURES 7–9. Male genitalia of Vietnamodes spp. 7. V. adelinae, slide No. QMJ15158; 8. V. dogueti, slide No. QMJ15159; 9. V. unicispina sp. nov., holotype, slide No. QMJ17030. (Scale bars: 0.5 mm)

FIGURES 10–12. Female genitalia of Vietnamodes spp. 10. V. adelinae, slide No. QMJ18036; 11. V. dogueti, slide No. QMJ15293; 12. V. unicispina sp. nov., paratype, slide No. QMJ18061. (Scale bars: 0.5 mm)