Diduga bispinosa Bayarsaikhan & Bae, 2018

Bayarsaikhan, Ulziijargal, Lee, Dong ˗ June & Bae, Yang ˗ Seop, 2018, Three new species of Diduga Moore, [1887] (Lepidoptera, Erebidae, Arctiinae) from Cambodia, Zootaxa 4514 (3), pp. 411-424 : 417

Diduga bispinosa Bayarsaikhan & Bae , n. sp.

( Figs. 4 , 11 )

Type materials. Holotype: 1 ♂, Koh Kong mountain area, Koh Kong Prov. (N11˚41′44.9″, E103˚06′51.8″), 25.XII.2014 (YS Bae, YD Ju, MJ Qi, U Bayarsaikhan, BS Park, SM Na, JW Kim, DJ Lee), Gen. Slide No. INU˗1415C. Paratype: 1 ♂, Pursat, Pursat Prov. (N12˚05′34.2″, E103˚11′10.1″), 4.V.2010 (YS Bae, XV Le, DY Chae), Gen. Slide No. INU˗1414C .

Diagnosis. By the wing pattern, the new species is similar to Diduga barlowi Holloway, 2001 ( Holloway 2001: 449˗450, pl. 8: 43, fig. 448; present paper: figs. 5, 14), but the male genitalia structure of both species are significantly different: apex of valva with an asymmetrical projection in lower angle; upper angle of valva roundly angled; saccus narrowly “U”˗shaped, almost same length with uncus; aedeagus with two slender spine˗shaped cornuti ( Fig. 11 ). In D. barlowi , apex of valva with large, less than asymmetrical projection in upper and lower angles; saccus broadly “U”˗shaped, almost two times shorter than uncus; aedeagus with a small spine˗shaped cornutus ( Fig. 14 ).

Description. Adult ( Fig. 4 ). Length of forewing 4˗5 mm in male. Head, patagium and tegula deep yellow. Thorax deep yellow, except dark brown second half. Forewing ground color dark brown (dark brown patch looks irregularly “Z” or “S”˗shaped), with deep yellow margin from basal to tornus, which hind border of margin broadly dentate in basal half of costal area and tornus; with several small, dark brown dots in deep yellow margin; cilia deep yellow. Hindwing ground color gray, tinged with pale brown; cilia pale brown. Abdomen brown, with deep yellow tuft.

Male genitalia ( Fig. 11 ). Uncus slender, waved, with strongly hook˗shaped apex. Tegumen triangular, weakly sclerotized. Valva short, rectangular, weakly sclerotized, with a stout, asymmetrical process (almost same length with valva) in lower angle of apex; process of left valva almost straight, tubular, with short, subapical and medial spines; process of right valva stout, weakly sickle˗shaped, with an apical spine and a large medial branch pointed, with an arch˗shaped process in inward. Juxta trapezoid, weakly sclerotized. Saccus “U”˗shaped, almost same length with uncus. Aedeagus slender, “S”˗shaped, weakly sclerotized and vesica with two slender spine˗shaped cornuti.

Female genitalia. Unknown.

Distribution. Cambodia (Koh Kong, Pursat provinces).

Etymology. The specific epithet is derived from the Latin “ bi ” meaning “twice” and “ spinos ” meaning “thorny”, refers to the two process of the left valva in the male genitalia.

Figures

FIGURES 1–6. Adults of genus Diduga spp. from Cambodia. 1a. D. albicosta, male (INU˗1742C). 1b. ditto, female (INU˗1998C). 2a. D. dubatolovi n. sp., male (holotype, INU˗1775C). 2b. ditto, female (paratype, INU˗1193C). 3a. D. kohkongensis n. sp., male (holotype, INU˗1412C). 3b. ditto n. sp., female (paratype, INU˗1743C). 4. D. bispinosa n. sp., male (holotype, INU˗1415C). 5. D. barlowi, male (INU˗1410C). 6. D. amoenusa, male (INU˗1411C).

FIGURES 10–11. Male genitalia of genus Diduga spp. from Cambodia. 10. D. kohkongensis n. sp. (holotype, INU˗1412C). 11. D. bispinosa n. sp. (holotype, INU˗1415C). Scale bar = 0.5 mm.

FIGURES 12–16. Male genitalia of genus Diduga spp. from Cambodia. 12. D. albicosta (INU˗1194C). 13. D. amoenusa (INU˗1411C). 14. D. barlowi (INU˗1410C). 15. D. alternota (INU˗1424C). 16. D. annulata (INU˗1420C). Scale bar = 0.5 mm.