Diduga bayartogtokhi Bayarsaikhan & Bae, 2019

Bayarsaikhan, Ulziijargal & Bae, Yang ˗ Seop, 2019, Four new and one newly recorded species of Diduga Moore, [1887] (Lepidoptera, Erebidae, Arctiinae) from Vietnam, with redescription of the little known species Diduga haematomiformis van Eecke, 1920, Zootaxa 4624 (3), pp. 365-376 : 368-370

Diduga bayartogtokhi Bayarsaikhan & Bae , n. sp.

( Figs 5 , 11 , 17 )

Type materials. Holotype: 1 ♂, Prov. Vinh Phuc, Tam Dao , 14.VIII.2005 (Y.S. Bae, J.H. Bae & P.V. Nha leg.), Gen. Slide No. INU˗ 1923V. Paratypes. (6 ♂, 1 ♀) Vietnam : 1 ♂, Prov. Hanoi, BaVi N.P., 2.VII.2003 (920 m), (Y.S. Bae & K.T. Park), Gen. Slide No. INU˗ 1925V ; 3 ♂, 1 ♀, Prov. Vinh Phuc, Tam Dao N.P., 14.VIII.2005 (Y.S. Bae, J.H. Bae & P.V. Nha leg.), Gen. Slide No. INU˗ 1917V, 1920V , 10013V, 10014V; 2 ♂, Prov. Hanoi, BaVi N.P., 19.VII˗5.VIII.2010 (700 m), (Y.S. Bae & X.V. Le), Gen. Slide No. INU˗ 1916V, 1928V.

Diagnosis. The male genitalia structure of the new species is significantly different from the allied species: right valva with one large spine˗shaped projection in middle of costal margin; large, membranous, rounded saccular process almost same length with apex of valva, covered with setae. In female genitalia, it can be distinguished from the latter by the almost symmetrical ostial plate consisting three spurs (edge of each spur strongly dentated) of both sides.

Description. Adult ( Figs 5a, 5b ). Length of forewing 7 mm in male, 8 mm in female. Head, patagium and tegula deep yellow. Thorax dark brown. Forewing ground color dark brown, with broad, deep yellow costal margin, which hind border broadly waved; with row of small, dark brown dots or patches from basal of costa to tornus; cilia deep yellow. Hindwing ground color pale brown; cilia pale brown. Abdomen brown, except deep yellow ventral, with deep yellow anal tuft in male. Male genitalia ( Fig 11 ). Uncus stout, apex angular, heavily covered with setae. Tegumen triangular, weakly sclerotized. Valva asymmetric: in left valva, broader than right valva, apex rounded, membranous, with irregularly truncate spur in harpe and one stout hook˗shaped process in apex of costal margin; and one large, one small (four times smaller than large one) irregular projections in costal margin; saccular process tapering, sclerotized, shorter than apex of valva, apex angled; in right valva, apex of valva dentate, with an elongate process, which process dentate in edge; and one large spine˗shaped projection in middle of costal margin; cucullus large, membranous, rounded apex, covered with setae, almost same length with apex of valva. Juxta triangular. Saccus “V”˗shaped. Aedeagus stout, weakly sclerotized and vesica with two diverse sized, spine˗shaped cornuti and scobination. Female genitalia ( Fig 17 ). Papillae anales weakly covered with setae. Ostial plate strongly sclerotized, wrinkled, consisting three spurs (edge of each spur strongly dentated) of both sides, heavily covered with short spines laterally. Ductus bursae tubular, membranous, almost same length with corpus bursae. Corpus bursae ovoid, with dense spinulose scobination.

Distribution. Vietnam (Hanoi, Vinh Phuc Prov.).

Etymology. The species name is dedicated with Professor Bayartogtokh Badamdorj (National University of Mongolia, Mongolia), the most famous entomologist in Mongolia up to date.

Figures

FIGURES 3–7.Adults of genus Diduga spp. from Vietnam. 3a. D. alternota, male (INU˗1934V). 3b ditto, female (INU˗1930V). 4a. D. hanoiensis n. sp., male (holotype, INU˗10012V). 4b. ditto n. sp., female (paratype, INU˗10015V). 5a. D. bayartogtokhi n. sp., male (holotype, INU˗1923V). 5b. ditto n. sp., female (paratype, INU˗10014V). 6a. D. quinquicornuta n. sp., male (holotype, INU˗1918V). 6b. ditto n. sp., female (paratype, INU˗10016V). 7. D. nigridentata n. sp., male (holotype, INU˗1915V).

FIGURES 10–11. Male genitalia of genus Diduga spp. from Vietnam. 10. D. hanoiensis n. sp. (holotype, INU˗10012V). 11. D. bayartogtokhi n. sp. (holotype, INU˗1923V).

FIGURES 14–18. Female genitalia of genus Diduga spp. 14. D. haematomiformis, Preanger, Java (syntype, RMNH. INS.1099032). 15. D. alternota, Vietnam (INU˗1937V). 16. D. hanoiensis n. sp., Vietnam (paratype, INU˗10011V). 17. D. bayartogtokhi n. sp., Vietnam (paratype, INU˗10014V). 18. D. quinquicornuta n. sp., Vietnam (paratype, INU˗10008V).