Cyana aurantifascia Volynkin, Černý & Dubatolov, 2017

Volynkin, Anton V., Černý, Karel & Dubatolov, Vladimir V., 2017, A new Cyana Walker, 1854 from Vietnam (Lepidoptera, Erebidae, Arctiinae), Zootaxa 4269 (3), pp. 438-446 : 439-440

Cyana aurantifascia Volynkin, Černý & Dubatolov , sp. nov.

(Figs. 1, 2, 11, 12, 18)

Type material. Holotype (Figs. 1, 11): ♂, “ 20.III.2016, South Vietnam, Lam Dong province, Lac Duong district, Tay Nguyen Highlands, Nui Ba National Park , leg. Vo Van Nhon ”, slide AV 2299m Volynkin (Coll. NHM, ex coll. CAV).

Paratypes: 1 ♂, 1 ♀, same locality and collector as the holotype, but 21.III.2016, slides AV 2300m and AV2301f Volynkin (Coll. CAV) ; 2 ♂, same locality and collector, but 20.III.2016 and 25.III.2016 (Coll. CAV) ; 2 ♂, Vietnam, Hon Ba , Khanh Hoa Prov., 12°12'–15°N, 108°57'– 109°05'E, 20–22.IV.2006, Monastyrski leg., slides AV 1660m and AV 1701m Volynkin (Coll. SZMN) ; 2 ♂, 1 ♀, Vietnam sept., Tam Dao , 950 m, V.1990, leg. Kubáň (Coll. CKC) ; 5 ♂, 2 ♀, S Vietnam, Plato Tay Nguyen, Mt. Ngoc Linh , 900–1400 m, 15°02'N, 107°59'E, 10– 25.VIII.1996, leg. Sinjaev & Afonin (Coll. MWM/ ZSM) ; 1 ♂, 3 ♀, S Vietnam, Bach-Ma Nat. Park, 1200 m, 16°10'N, 107°54'E, 26.VII.–6.VIII.1996, leg. Sinjaev & Afonin, ex coll. A. Schintlmeister (Coll. MWM/ ZSM) .

Diagnosis. The closest relatives of C. aurantifascia sp. nov. are Cyana dohertyi ( Elwes, 1890) known from Himalaya, SW China and North Thailand and Cyana ariadne ( Elwes, 1890) (Figs. 3, 4) known from southern China. Externally, the new species (Figs. 1, 2) differs from the both relatives (Figs. 3–6) by its broad and connected orange transverse lines, the larger discal spots, and the intensive pinkish hindwings, whereas in C. dohertyi and C. ariadne the transverse lines are narrower, yellow ( C. dohertyi ) or pale red ( C. ariadne ), the subbasal and antemedial lines are not connected between Cu and A veins, the discal spots are smaller, the hindwings are significantly paler. The forewing pattern of the new species resembles that of the one more species of the C. dohertyi species-group, Chinese Cyana abiens Fang, 1992 ( Fig. 9 ), but differs clearly from it by the broader, darker, orange transverse lines, the larger and differently situated discal spots, and the darker, more reddish hindwings. The forewing pattern of C. aurantifascia sp. nov. also surprisingly resembles that of Chinese C. phaedra (Figs. 7, 8) belonging to another species-group, but differs by the narrower forewings, the intensive orange coloration of much the broader transverse lines, the much larger discal spots, and absence of the irregular strong inner dentation of terminal line. The male genitalia of C. aurantifascia sp. nov. ( Figs. 11, 12 ) differ from those of C. dohertyi ( Fig. 13 ) by the somewhat longer uncus, the stronger distal saccular proces, more numerous spines in the subbasal ventral field of cornuti, the much longer dorsal diverticulum with an additional lateral diverticulum, and presence on its distal basal part of a round field of spine-like cornuti, whereas in C. dohertyi the field is present as a curved long band; from C. ariadne ( Fig. 14 ) differ by the somewhat longer uncus, the longer subbasal ventral field of cornuti, the much larger dorsal diverticulum with an additional lateral diverticulum, and presence on its distal basal part of a round field of spine-like cornuti, whereas in C. ariadne the field is present as a curved long band; from C. phaedra ( Fig. 15 ) differ clearly by the narrower distal section of valva, the shorter and stronger saccular processes, and the vesica configuration. The female genitalia of C. aurantifascia ( Fig. 18 ) differ from those of C. dohertyi ( Fig. 19 ) by the stronger sclerotized and rugose posterior section of corpus bursae, and the much broader, bulbous distal section appendix bursae; from C. ariadne ( Fig. 20 ) differ by the stronger sclerotized and rugose posterior section of corpus bursae, and somewhat shorter appendix bursae. Externally, C. aurantifascia sp. nov. slightly resembles C. interrogationis ( Poujade, 1886) ( Figs. 10 , 16 ), which belongs to a different species-group. The resemblance is in its orange transverse lines and reddish hindwings, but differs clearly by the narrower forewing, the white ground color of forewing, the larger discal spots, the paler hindwings, and the genitalia structures.

Description. Adults (Figs. 1, 2). Length of forewing 15–17 mm in males and 20 mm in females. The sexual dimorphism well expressed: besides presence of forewing androconial lobes on the underside of forewing, male has smaller size, narrower forewing, presence of black stroke on R2 vein, and darker, more reddish hindwing. Head white. Antennae ciliate in both sexes. Thorax white, with broad orange bands on tegulae and patagia margins, and orange transverse bands on medial and posterior parts. Abdomen whitish with numerous pink scales. Forewing ground color white. Transverse lines orange, wavy. Subbasal and antemedial lines connected between Cu and A veins. In apical part of cell there are three large black discal spots. Cilia white. Hindwing pale reddish in males and pale yellowish pink in females, its anterior margin paler than other wing parts; discal spot dark grey, semilunar, poorly visible; cilia pinkish. Male genitalia ( Figs. 11, 12 ). Uncus short, slender, apically narrowed, basally connected with subscaphium. Anal tube broad, subscaphium narrow, weakly sclerotized, scaphium broad, weakly sclerotised, with granulation. Tegumen of moderate length, narrow; vinculum short, broad, U-like; juxta trapezoidal, with weaker sclerotized medial part. Valva lobe-like, with strongly curved dorsal margin, distally narrowed; sacculus broad, moderately sclerotized; distal saccular extension long, strong, with spine-like tip, distally curved and well separated from distal part of valva, its tip reaches valva apex. Clasper well sclerotized, setose, strongly curved distally, with very short, tubercle-like, ventrally directed harpe. Aedeagus long and narrow, carina with short triangular extension dorsally and field of scobination ventrally. Vesica membranous, consists of largest conical dorsal diverticulum and a few smaller diverticuli; subbasal ventral field of spine-like cornuti bandlike; largest dorsal diverticulum with large globular additional lateral diverticulum with weak scobination, and short diverticulum basal-distally with field of spine-like cornuti; in distal part of vesica three finger-like diverticuli, one of them with strong dentate scobination; basal plate of ductus ejaculatorius long and narrow, weakly sclerotized; ductus ejaculatorius ventrally projected. Female genitalia ( Fig. 18 ). Ovipositor short and broad. Papillae anales rectangular with rounded angles; apophyses posteriores thin, about three times longer than apophyses anteriores; apophyses anteriores broadly triangular; ostium bursae broad, antrum funnel-like, membranous; ductus bursae of moderate size, membranous with weak rugose sclerotization; corpus bursae elongated, its posterior section strongly sclerotized, rugose; anterior section weakly sclerotized, slightly rugose, with weak scobination and small elliptical signum. Appendix bursae large, arising leftward from posterior end of corpus bursae, distally globular and membranous, basally very narrow and strongly rugose sclerotized.

Distribution. The species is known from South Vietnam.

Etymology. The species name refers to its colorful orange yellow transverse lines of forewings.

Figures

FIGURES 9 – 12. Cyana spp.: adults (9, 10) and male genitalia (11, 12). 9, C. abiens, holotype ♂, China, Prov. Shaanxi, Qinling (IZCAS); 10, C. interrogationis, ♂, S Vietnam, Lam Dong prov. (CKC); 11, C. aurantifascia, holotype, S Vietnam, Lam Dong prov., slide AV 2299 m Volynkin; 12, C. aurantifascia, paratype, S Vietnam, Lam Dong prov., slide AV 2300 m Volynkin.

FIGURES 13 – 15. Cyana spp.: male genitalia. 13, C. dohertyi, India, Manipur, slide BMNH (E) Arct- 6563 m Volynkin (© NHM); 14, C. ariadne, syntype, China, Chang Yang, AV 1876 m Volynkin; 15, C. phaedra, China, Zhejiang prov., slide AV 2029 m Volynkin.

FIGURES 16 – 20. Cyana spp.: male (16) and female (17 – 20) genitalia. 16, C. interrogationis, Central Vietnam, slide AV 1700 m Volynkin; 17, C. phaedra, China, Zhejiang prov., slide AV 2030 f Volynkin; 18, C. aurantifascia, paratype, S Vietnam, Lam Dong prov., slide AV 2301 f Volynkin; 19, C. dohertyi, India, Sikkim, slide BMNH (E) Arct- 6564 f Volynkin (© NHM); 20, C. ariadne, China, Fujian, AV 2058 f Volynkin.