Cyana angkorensis Bayarsaikhan & Bae

Bayarsaikhan, Ulziijargal & Bae, Yang-Seop, 2016, A review of the genus Cyana Walker, 1854 (Lepidoptera, Erebidae, Arctiinae) from Cambodia, with description of new species, Zootaxa 4114 (4), pp. 447-463 : 449-450

Cyana angkorensis Bayarsaikhan & Bae , sp. n.

(Pl. 1: 1a, 1b; 3: 1; 5: 1)

Type material. Holotype: Male, Cambodia, Samkos (N12˚12′40″, E102˚52′13″), 23.XII.2014 (Bae YS, Ju YD, Qi MJ, Bayarsaikhan U, Park BS, Na SM, Kim JW & Lee DJ), Gen. Slide No. UIK-1406. 11 Paratypes: 3 males, 6 females, Cambodia, Samkos (N12˚12′40″, E102˚52′13″), 23.XII.2014 (Bae YS, Ju YD, Qi MJ, Bayarsaikhan U, Park BS, Na SM, Kim JW & Lee DJ), Gen. Slide No. UIK-1404, 1405, 1655, 1656, 1657, 1658, 1659, 1660, 1661; 2 females, Cambodia, Seima (N12˚14′54″, E107˚03′14″), 11.XI.2011 (Bae YS, Kim YK, Ju YD, Park BS & Lee HJ), Gen. Slide No. INU-1083, 1369.

Description. Adult (Pl. 1: 1a, 1b). Wingspan ♂ 21–22 mm, ♀ 25–28 mm. Frons and vertex pure white; labial palpi upturned over vertex, fuscous gray; cilia on antennae, fuscous. Patagia pure white with brown band. Tegula pure white, with transversal red band. Forelegs dark gray mixed with white scales; femora of midlegs white, tibiae white, except for a fuscous dorsal area, with a pair spurs in apical part, tarsi fuscous; femora of hindlegs white, tibiae white with a pair spurs in middle part (one short, another one long) and a pair spurs in apical part, tarsi fuscous. Forewing with ground color sordid white; subbasal and antemedial lines red; rhomboid antemedial spot red; medial line waved, shortly forked at costa, with hair fringe at costa; postmedian line red, finished in middle part, from middle lead to one spot and short band to costa; subterminal series of red three spots; terminal series of red-yellow small spots; fringe white-yellow. Hindwing fuscous in males, sordid white in females; one dark discocellular spot in both sexes; fringe white-yellow.

Male genitalia (Pl. 3: 1). Uncus slender, 1.5 times longer than tegumen; valvae triangular, with apical gap and one angular, sclerotized process on the harpe towards the apex; saccular process short, with rounded apex; juxta Xshaped; aedeagus short, stout, sclerotized in distal end, with two apical spines; vesica with one group of short spines and one group of long spines, which are more than 8 times longer than previously mentioned short spines and lacking scobinated area.

Female genitalia (Pl. 5: 1). Papillae anales rectangular; apophyses posteriores about 3 times longer than apophyses anteriores, slender; apophyses anteriores stout; ductus bursae strongly sclerotized, short, stout; corpus bursae lamp-shaped, ringed by strongly sclerotized spines in cervix of bursae, which are connected with ductus bursae by a band consisting of spines, and a large, coffee-bean shaped signum in body of bursae covered with weak spines.

Diagnosis. This species is similar to C. effracta Walker , but can be distinguished from it by the following characters: smaller size (♂ 22 mm, ♀ 28 mm), ground color of forewing sordid white, and hindwing fuscous whole of upperside. In C. effracta , more big size (♂ 25 mm, ♀ 35), ground color of forewing pure white, and hindwing pure white, with pale brown antemedial and subterminal lines.

The two species differs in characters of male genitalia: in C. angkorensis sp. n., uncus slender, 1.5 times longer than tegumen, apex of valvae triangular, with apical gap and one angular, sclerotized process on the harpe towards the apex, distal end of aedeagus sclerotized, with two apical spines and vesica with one group of short spines and one group of long spines, which are more than 8 times longer than previously mentioned short spines and lacking scobinated area; in C. effracta , uncus arrowhead-shaped, 0.5 times shorter than tegumen, apex of valvae rounded, with short, roundly angular process in below apex and without angular process on the harpe, distal end of aedeagus sclerotized, without apical spine and vesica with one group of short spines and one group of stout spines, which almost same length with previously mentioned short spines and with weakly scobinated area.

It is also differs in characters of female genitalia: in C. angkorensis sp. n., ductus bursae strongly sclerotized, corpus bursae with a large, coffee-bean shaped signum in posterior half of bursae covered with weak spines; in C. effracta , ductus bursae not sclerotized, corpus bursae with a more elongate signum (2 times longer than C. angkorensis ) in posterior half of bursae not covered with weak spines.

Distribution. Cambodia (Samkos, Seima).

Etymology. The species name is dedicated to the capital city of Khmer Empire (= formerly country of Cambodia), which flourished from approximately the 9th to 15th centuries.