Barsine amaculata Volynkin & Černý, 2016

Volynkin, Anton V. & Černý, Karel, 2016, Barsine amaculata, a new species from Vietnam (Lepidoptera, Erebidae, Arctiinae), Zootaxa 4200 (2), pp. 345-350 : 345-350

Barsine amaculata Volynkin & Černý , sp. nov.

( Figs 3, 4 , 9, 10 , 14 )

Type material. Holotype ( Figs 3 , 9 ): S. Vietnam, Bao Loc, Rung Cat Tien , 11.32’N, 107.48’E, 1500 m, 10–20.XII.1992, Sek. Wald, leg. Sinajev & Simonov, ex coll. Schintlmeister / Slide AV 1802m A. Volynkin (holotype preserved in coll. NHM, ex coll. CKC). Paratypes: 1 female, same label as holotype, slide AV1801f Volynkin (coll. CKC) ; 3 males, South Vietnam, Lam Dong province, Lac Duong district, Tay Nguyen Highlands, Nui Ba National Park , leg. Vo Van Nhon, slide AV 1599m Volynkin (coll. CAV) ; 1 male, IV. 2016, Central Vietnam, Thua Thien-Hue province, Annamite Mts., Bach Ma National Park , 1400 m, leg. Le Luong Thanh (coll. CAV).

Diagnosis. The new species belongs to the Barsine prominens species group including B. prominens (Moore) , B. syntypica Swinhoe , B. fasciata (Leech) , B. terminifusca (Daniel) , B. conformis (Fang) , B. multistriata (Hampson) , B. nigralba (Hampson) , B. radians (Moore) , B. maculifasciata (Hampson) and B. kuatunensis (Daniel) . Members of the species group have creamy white or pale yellow ground color of forewings and black pattern consisting of transverse lines, a discal dot and lengthwise strokes on veins in outer part of forewing. In the male genitalia ( Fig. 1 ), medial costal extension long, narrow, apically pointed, directed ventrally; distal costal extension small and narrow, directed dorsally; distal saccular extension triangular, long, without dorsal lobe; basal part of sacculus weakly sclerotized, without process and dorsal lobe. In the female genitalia ( Fig. 2 ), posterior section of ductus bursae strongly sclerotized; appendix bursae well developed, large, strongly curved; medial section of corpus bursae and appendix bursae with numerous spinules. According the male genitalia structure and wing pattern, the closest relatives of the new species are B. fasciata ( Leech, 1899) and B. syntypica Swinhoe, 1906 . Externally, B. amaculata sp. n. ( Figs 3, 4 ) differs from B. fasciata ( Figs 5, 6 ) by absence of a discal spot and the not interrupted distal strokes on veins; from B. syntypica ( Fig. 7 ) differs by the narrower forewing, the broader and much less curved transverse lines, absence of a discal spot, submarginal line W-like curved opposite the cell, and broader submarginal area with longer lengthwise strokes on veins. By the wing pattern, B.

amaculata sp. n. resembles also B. pluma Černý ( Fig. 8 ) belonging to another species group, but differs by the less curved inner and medial transverse lines, the interrupted and curved outer transverse line, and absence of a discal spot. The male genitalia of B. amaculata sp. n. ( Figs 9, 10 ) differ from those of B. fasciata ( Fig. 11 ) by the slightly longer medial costal extension, the longer apical lobe of valva, the long, narrow and dorsally curved distal saccular extension, presence of the two additional small dorsal diverticuli in vesica, and the vesica ornamentation: in B. amaculata sp. n., the vesica with one medial field of broad small cornuti and a broad dorsal field of strong granulation, whereas in B. fasciata the vesica with two fields of small broad cornuti and three broad fields of granulation covering a main part of vesica; from B. syntypica ( Fig. 12 ) differ by the distally broader valva, the broader base of the medial costal extension, the narrower distal costal extension, the much longer apical lobe of valva, the longer, narrower and dorsally curved distal saccular extension, broader and shorter aedeagus, absence of a long medial diverticulum, and more numerous and stronger cornuti; from B. pluma ( Fig. 13 ) differ clearly by the narrower uncus, absence of an apical lobe of juxta, the narrow and apically pointed medial costal extension, the much smaller distal costal extension, the longer apical lobe of valva, absence of a basal dorsal lobe of sacculus, the much longer and apically pointed distal saccular extension, and the more numerous and smaller cornuti in the vesica. The female genitalia of B. amaculata sp. n. ( Fig. 14 ) differ from those of B. fasciata ( Fig. 15 ) by the shorter apophyses anteriores, the broader and shorter sclerotized posterior section of ductus bursae, the narrower corpus bursae, the broader appendix bursae, the smaller signum and the more numerous spiculi in the medial section of corpus bursae; from B. syntypica ( Fig. 16 ) differ by the shorter apophyses anteriores, the much shorter and broader posterior sclerotized section of ductus bursae, the smaller and stronger curved appendix bursae, absence of a sclerotized area in the corpus bursae near its connection with the ductus bursae, and the stronger and more numerous spinules in the appendix bursae and the medial section of corpus bursae; from B. pluma ( Fig. 17 ) differs by the the shorter apophyses anteriores, absence of a V-like sclerotized antevaginal plate, the longer and broader ductus bursae, and presence of the appendix bursae.

Description. Adult ( Figs 3, 4 ). Length of forewing 9–10 mm in males and 10 mm in female. Male antennae ciliate, female antennae filiform. Body ochreous yellow. Male forewing slightly narrower than that of female. Forewing ground colour creamy white; pattern black, consists of one subbasal spot, transverse lines, and lengthwise strokes on veins in outer part of forewing; subbasal spot large; inner transverse line broad, curved, interrupted, consists of three trapezoidal spots; medial and outer transverse lines moderately broad, curved, interrupted, consist of three long transverse strokes; submarginal line W-like curved opposite the cell; outer part of wing with long lengthwise strokes on veins; cilia creamy white with black bots opposite the veins. Hindwing creamy white, with diffuse, slightly wavy thin medial band and blackish suffusion on veins outwards from it; cilia creamy white. Male genitalia ( Figs 9, 10 ). Uncus long, narrow, curved, laterally flattened, moderately broadened subapically, apically pointed. Tuba analis broad, membranous; scaphium narrow, moderately sclerotized; subscaphium as broad scobinate area. Tegumen short and broad; juxta broad and short, with two short lateral apical lobes; vinculum large, U-like. Valva long, distally broadened; costa broad, well sclerotized; medial costal extension at broad base, moderately long, distally narrow, apically pointed; distal costal extension short and narrow, dorsally directed; apical lobe of valva long and broad; sacculus moderately sclerotized, without basal extension and lobe; distal saccular extension long, narrow, apically pointed, dorsally curved. Aedeagus long and broad, slightly curved; vesica broad, its medial sction broad, with triangular area of small broad cornuti; dorsal section of vesica with two small conical dorsal diverticuli and broad are of strong granulation; basal plate of ductus ejaculatorius short and narrow. Female genitalia ( Fig. 14 ). Papillae anales broad, rectangular with rounded edges; apophyses anteriores and posteriores of approximately equal length, long and thin. Ostium bursae broad; posterior section of ductus bursae strongly sclerotized, flattened dorso-ventrally, broad; posterior section of ductus bursae membranous and narrow. Corpus bursae elliptical, with numerous spinules in medial and anterior sections and elliptical granulose signum in anterior section; appendix bursae laterally positioned, large, strongly curved distally, with numerous spinules.

Distribution. The species is known from Central and South Vietnam.

Etymology. The species name refers to the absence of a discal spot in forewing which is presented in all other members of the species group.

Figures

FIGURES 3 – 8. Barsine spp.: adults. 3, B. amaculata, holotype male, S Vietnam, Lam Dong province (NHM); 4, B. amaculata, paratype female, S Vietnam, Lam Dong province (CKC); 5, B. fasciata, male, C Vietnam, Thua Thien-Hue province (CAV); 6, B. fasciata, holotype female, China, Sichuan province, Omei-Shan (© NHM, coll NHM); 7, B. syntypica, male, Borneo, Sarawak (© NHM, coll NHM); 8, B. pluma, male, N Thailand, Lampang province (SZMN).

FIGURES 9 – 11. Barsine spp.: male genitalia. 9, B. amaculata, holotype, S Vietnam, Lam Dong province, slide AV 1802 m Volynkin; 10, B. amaculata, paratype, S Vietnam, Lam Dong province, slide AV 1599 m Volynkin; 11, B. fasciata, C Vietnam, Thua Thien-Hue province, slide AV 2328 Volynkin.

FIGURES 12 – 17. Barsine spp.: male (12, 13) and female (14 – 17) genitalia. 12, B. syntypica, Borneo, Sarawak, slide BMNH Arct. 4745 (© NHM) (photo by A. Zilli); 13, B. pluma, N Thailand, Lampang prov., slide AV 1766 m Volynkin; 14, B. amaculata, paratype, S Vietnam, Lam Dong province, slide AV 1801 f Volynkin; 15, B. fasciata, C Vietnam, Thua Thien-Hue province, slide AV 2329 f Volynkin; 16, B. syntypica, West Sumatra, slide AV 2331 f Volynkin; 17, B. pluma, C Thailand, Phetchabun prov., slide AV 2330 f Volynkin.

FIGURES 1 – 2. Structure of the genitalia of Barsine prominens. 1, male genitalia, NE India, slide AV 1914 m Volynkin (coll. ZFMK); 2, female genitalia, NE India, slide AV 1917 f Volynkin (coll. ZFMK).