Diduga chebalinga, Zhao & Han, 2020

Zhao, Ting Ting & Han, Hui Lin, 2020, Four new species of the genus Diduga Moore, [1887] (Lepidoptera, Erebidae, Arctiinae) from China and Malaysia, ZooKeys 985, pp. 127-141 : 127

Diduga chebalinga sp. nov. Figs 5 , 6 , 16 , 23 , 28

Material examined.

Holotype: China: ♂, Prov. Guangdong, Shaoguan, Chebaling National Nature Reserve; 24.731°N, 114.267°E, elevation 463 m; 29.IV-3.V.2019; leg. H. L. Han & J. Wu; genit. prep. no. ztt-078-1; in NEFU. Paratype: 1♀; same data as holotype; genit. prep. no. ztt-077-2; in NEFU.

Diagnosis.

The new species is externally similar to D. quinquicornuta Bayarsaikhan & Bae, 2019 (Figs 4 , 17 , 24 ). It can be separated from the latter by the following characters ( D. quinquicornuta details between parentheses): the wingspan is broader; the tegumen is thin (thick); the right costal process is long, wide, flat, and rounded distally (short, hornlike, sharp distally); the cucullus is sclerotized, thick, spoon-shaped, with a short horn distally (poorly sclerotized, club-shaped, wrinkled); the uncus is slightly swollen medially, not bending ventrally (wider and flat, hooked apex); in the female genitalia, the ostium bursae is strongly sclerotized, wrinkled, and bending to the left (weakly wrinkled, typical); the ductus bursae is curved, gradually broadening from anterior to posterior (typical, tapered); the corpus is divided into two parts, a posterior part membranous, and the anterior one globular, densely covered small flecks (long oval, anterior half with dense, small flecks, and more than 6 signa forming a vertical semicircle, posterior half membranous, smooth).

Description.

Adult: (Figs 5 , 6 ) Wingspan 13-14 mm, female larger than male. Head yellow; antenna filiform. Thorax dark brown; patagium, and tegula yellow. Abdomen brown, with pale yellow anal tuft. Forewing with dark brown ground color; costal band broad, yellow, with dispersed small, dark brown scales; its inner edge undulated; terminal band of same color as costal one, and its inner edge undulated, with an approximately right-angled bend near tornus; terminal line with an admixture of brown and yellow; fringe yellow. Hindwing smoky brown, fringe pale to smoky brown. Male genitalia (Fig. 16 ). Tegumen triangular, thin, and narrow superiorly. Vinculum broadly V-shaped, sclerotized, thick. Valva asymmetrical and bifurcated; in the left one, basal projections of valva bifurcated, one short, the other one ca 6 times as long as the short one; sacculus thick, gradually broadening distally; saccular process narrow, smoothly arched; costa rather broad, smooth, with a curved, cone-shaped ampulla; costal process strongly sclerotized, thick, wedge-shaped; harpe short, cone-shaped, strongly sclerotized, cucullus spoon-shaped, with short, sclerotized horns distally; in the right one, sacculus weakly sclerotized, swollen, basal process lumpy; saccular process strongly sclerotized, short, sharp distally; costa broad, smooth, with a long, flat ampulla; costal process membranose; cucullus strongly sclerotized, bifurcated, one slender, rounded distally, the other one finger-shaped, distally. Uncus thick, covered with setae, slightly swollen medially, ca 7/9 as long as tegumen. Aedeagus weakly sclerotized, with small bulge at coecum; vesica with a small flecks plate at ventral part of basal. Female genitalia (Fig. 23 ). Ostium bursae broad, bent to left, with thick and sclerotized frame; lamella antevaginalis tongue-shaped. The 7th abdomere strongly sclerotized, wrinkled, densely covered with setae. Ductus bursae curved, gradually broadening posteriorly. Corpus bursae divided, anterior half globular, densely covered with small flecks, posterior half membranous, thin, and wrinkled. Papillae anales broad, covered with setae.

Etymology.

The species is named after the type locality, Chebaling National Nature Reserve, Guangdong Province, China.

Distribution.

China (Guangdong: Chebaling) (Fig. 28 ).

Habitat.

The species was collected using a light trap close to a typical evergreen broadleaf forest of the mid-subtropics near the Zhangdong River. The main tree species in the collecting biotope is Cunninghamia lanceolata (Lambert) Hooker, 1827.

Figures

Figure 28. Collecting sites of Diduga spp. Key: D. simianshana sp. nov.: China, Chongqing, Mt Simian (blue dot); D. chebalinga sp. nov.: China, Prov. Guangdong, Shaoguan, Chebaling (red dot); D. chewi sp. nov. and D. hollowayi sp. nov.: Malaysia, Borneo (both green dot).

Figures 1 - 6. Adults of Diduga spp. 1 D. simianshana sp. nov., male, holotype, China (Chongqing) 2 dittos, female, paratype, China (Chongqing) 3 D. nigridentata, male (after Bayarsaikhan and Bae 2019) 4 D. quinquicornuta, male (after Bayarsaikhan and Bae 2019) 5 D. chebalinga sp. nov., male, holotype, China (Guangdong) 6 ditto, female, paratype, China (Guangdong). CB: costal band; IE: inner edge of costal band; TB: terminal band.

Figures 14 - 17. Male genitalia of Diduga spp. 14 D. simianshana sp. nov., holotype, genit. prep. No. ztt- 070 - 1 15 D. nigridentata, 2019 (after Bayarsaikhan and Bae 2019) 16 D. chebalinga sp. nov., holotype, genit. prep. No. ztt- 078 - 1 17 D. quinquicornuta (after Bayarsaikhan and Bae 2019). Scale bars: 0.5 mm.

Figures 22 - 27. Female genitalia of Diduga spp. 22 D. simianshana sp. nov., paratype, genit. prep. No. ztt- 073 - 2 23 D. chebalinga sp. nov., paratype, genit. prep. No. ztt- 077 - 2 24 D. quinquicornuta (after Bayarsaikhan and Bae 2019) 25 D. chewi sp. nov., paratype, genit. prep. No. ztt- 102 - 2 26 D. hollowayi sp. nov., paratype, genit. prep. No. ztt- 083 - 2 27 D. kohkongensis (after Bayarsaikhan & Bae, 2018). Scale bars: 0.5 mm.