Halone angkorwat Bayarsaikhan & Bae, 2025

Bayarsaikhan, Ulziijargal, Cha, Yeong-Bin, Kwon, Hyung Wook & Bae, Yang-Seop, 2025, Genus Halone Walker (Lepidoptera, Erebidae, Arctiinae) from Cambodia, with two new species and a newly recorded species, Zootaxa 5660 (1), pp. 125-133 : 127-129

Halone angkorwat Bayarsaikhan & Bae , sp. nov.

LSID: urn:lsid:zoobank.org:act:F1EC0B11-F533-4827-AF88-B2A9AD943DAF

( Figures 2 , 7 , 12 )

Type material Holotype. [ CAMBODIA] ♂, Seima (N12˚14′54″, E107˚03′15″), 11.XI.2011 (Bae YS, Kim YK, Ju YD, Park BS, Lee HJ), adults and genitalia slides no. INU-1977C . Paratypes. (2 ♀) [ CAMBODIA] ♀, same data as the holotype, adults and genitalia slides no. INU-10036C ; ♀, Seima (N12˚16′44″, E107˚03′56″), 12.XI.2011 (Bae YS, Kim YK, Ju YD, Park BS, Lee HJ), adults and genitalia slides no. INU-10038C .

Diagnosis. By the wing pattern of this species, it is hardly distinguishable from many others of the Oriental Halone . The male genitalia structure of the new species is similar to H. arcuata Bayarsaikhan & Bae, 2022 (in the present study: Figs. 16–18 ), but it can be distinguished from the latter by the almost straight, asymmetric saccular process that is longer than the tegumen, a triangular tegumen with a strongly sclerotized dorsal lobe, and the aedeagus vesica without a distinct cornutus. In H. arcuata , the strongly waved, sclerotized saccular process is shorter than the tegumen, the rectangular tegumen has a sclerotized, rounded dorsal lobe, and the aedeagus vesica contains several spine-shaped cornuti ( Bayarsaikhan et al. 2022: 388, figs. 5a, 5b; in the present study: Fig. 17 ). In the female genitalia, the following features clearly separate the new species from H. arcuata , a weakly sclerotized postvaginal plate with weakly sclerotized and wrinkled lateral lobes; the lamella antevaginalis has a pair of large arch-shaped plates; and the ductus bursae membranous. In H. arcuata , the sclerotized postvaginal plate has strongly serrulate, triangular lateral lobes; the lamella antevaginalis has a large arch-shaped plate; and the ductus bursae is partly sclerotized ( Bayarsaikhan et al. 2022: 389, fig. 9; in the present study: Fig. 18 ).

Description Adult ( Figs. 2a, 2b ). Length of the forewing 6.5–7 mm in both sexes. Head, patagium, tegula and thorax sordid white, mixed with brown scales. Forewing ground color sordid white, with pale brown sprinkles; antemedial, medial, and postmedial dark brown patches on the costal margin; medial area of forewing with two rounded, dark brown, distinct patches; cilia sordid white. Hindwing pale brown; cilia pale brown. Abdomen fuscous in both sexes. Male genitalia ( Fig. 7 ). Uncus stout, pointed, curved. Tegumen weakly sclerotized, with a strongly sclerotized, rounded dorsal lobe. Valva membranous, narrow, weakly angled in the medial area of the sacculus, rounded apex with weakly covered with setae, almost the same length as the tegumen. The strongly sclerotized saccular process asymmetric, the more waved left process being longer than the almost straight right one, both processes dentate apical half, and longer than valva. Vinculum broadly “U”-shaped. Aedeagus stout, with a weakly sclerotized carina, and vesica with a weakly sclerotized, tubular elasma, and scobinate. Female genitalia ( Fig. 12 ). Papillae anales weakly covered with setae. Weakly sclerotized postvaginal plate with weakly sclerotized and wrinkled laterial lobes. Broadly tubular antrum strongly sclerotized. Both apophysis slender, and the apophysis posterioris slightly longer than the apophysis anterioris. Strongly sclerotized lamella antevaginalis with a pair of large, arch-shaped plates. Membranous ductus bursae tubular. Corpus bursae globular, membranous, with a strongly dentate signum on the center of bursae.

Distribution. Cambodia (Mondulkiri Prov.).

Etymology. The specific epithet is a proper noun referring to Angkor Wat, the most famous and historically important cultural site in Cambodia.

Figures

FIGURES 2–6. Adults of the Cambodian Halone species. 2a, H. angkorwat sp. nov., male, INU-1977C; 2b, ditto, female, INU-10036C; 3, H. specularis sp. nov., male, INU-1978C; 4a, H. ivetae, male, INU-10305L; 4b, ditto, female, INU-10439C; 5a, H. hollowayi, male, INU-1568C; 5b, ditto, female, INU-10033C; 6a, H. ariadna, male, INU-1009C. 6b. ditto, female, INU- 10073L. Scale bar: 5 mm.

FIGURES 7–11. Male genitalia of the Cambodian Halone species. 7, H. angkorwat sp. nov., INU-1977C; 8, H. specularis sp. nov., INU-1978C; 9, H. ariadna, INU-1009C; 10, H. ivetae, INU-10305L; 11, H. hollowayi, male, INU-1568C. Scale bar: 5 mm.

FIGURES 12–15. Female genitalia of the Cambodian Halone species. 12, H. angkorwat sp. nov., INU-10038C; 13, H. ivetae, INU-10439C; 14, H. hollowayi, male, INU-10033C; 15, H. ariadna, INU-10072C. Scale bar: 1 mm.

FIGURES 16–18. Adult and genitalia of Halone arcuata Bayarsaikhan & Bae, 2022 from Vietnam. 16a, Male, holotype (INU-10303V); 16b, Female, paratype (INU-10429V); 17, Male genitalia (INU-10303V); 18, Female genitalia (INU- 10429V).