Diduga simianshana, 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 simianshana sp. nov. Figs 1 , 2 , 14 , 22 , 28

Material examined.

Holotype: China: ♂; Chongqing, Jiangjin, Mt. Simian; 28.584°N, 106.356°E, elevation 1103 m; 12-13.VII.2018; leg. H.L. Han & C. Zhang; genit. prep. no. ztt-070-1; in NEFU. Paratypes: 3♀♀; same data as holotype; genit. prep. nos. ztt-073-2, ztt-074-2, ztt-080-2; in NEFU.

Diagnosis.

The new species is externally similar to D. nigridentata Bayarsaikhan & Bae, 2019 (Figs 3 , 15 ). It can be separated from the latter by the following characters ( D. nigridentata details are between parentheses): the ground color of the forewing is darker; an approximate right-angled bulge at tornal area (with arched bulge); the ground color of the hindwing is darker, in the male genitalia, the two basal projections of valva are longer than tegumen (shorter); the left cucullus bears two small spines (only a single long spine); the right cucullus and costal process are fused (separated); the cornutus is long and straight (short and arched).

Description.

Adult: (Figs 1 , 2 ) Wingspan 13-14 mm. Head yellow; antenna filiform, brown. Thorax dark brown, patagium and tegula yellow. Abdomen with pale yellow anal tuft. Forewing with dark brown ground color; costal band broad, yellow, with several small, dark brown dots, its inner edge undulated; median line absents at costa but present as a dot at the inside inner edge of costal band; terminal band of same color as costal one, inner edge of terminal band undulated, with an approximate right-angled bulge at tornus; terminal line with an admixture of brown and yellow; fringe yellow. Hindwing smoky brown, with diffuse, small, dark brown flecks; fringe pale to smoky brown, light yellow basally. Male genitalia (Fig. 14 ). Tegumen triangular, weakly sclerotized, as long as uncus; the basal projections of tegumen asymmetrical, strongly sclerotized, clavate, with a triangular denticle distally; left one with large hemispherical tubercle distally, right one fist-sharped. Vinculum U-shaped, sclerotized, thick. Valva rather flat, broad, asymmetrical; the left one longer and wider; sacculus long, mostly straight, barely shorter than whole valva, saccular process curved, fingerlike, with long, sclerotized terminal spine; costa very narrow, thick, as long as valva; cucullus strongly sclerotized and tapered into elongate subtriangular process, with a long stout spine distally; the right one flat, sacculus narrow and straight, saccular process curved, fingerlike, with a shorter terminal spine; costa narrow; cucullus strongly sclerotized and tapered, with a long stout spines distally. Uncus sinuous, short and thick basally; swollen before pointed, hooked apex. Aedeagus cylindrical, smoothly curved, coecum swollen and short, ca 1/9 as long as overall aedeagus; vesica with a small triangular cornutus, and a slender, long cornutus accompanied by a small band of hair. Female genitalia (Fig. 22 ). Ostium bursae rough and weakly sclerotized, the 8th abdominal segment shaping a deeply invaginated V-shaped ostium bursae; two triangular lobes at both sides. The posterior margin of the 7th abdominal has a distinctly sunken fold. The 6th abdominal segment slightly thickened posteriorly, with slight ridges on both sides. Ductus bursae long and narrow, twisted at middle, its posterior half strongly sclerotized, flat and straight, and anterior one membranous, partly rugose. Corpus bursae globular, membranous, with a ring-shaped signum band. Apophysis anterior rather thick, ca 5/8 as long as apophysis posterior, this slender and long. Papillae anales cone-shaped, covered with setae.

Etymology.

The species is named after the type locality, Mt. Simian, Chongqing Municipality, China.

Distribution.

China (Chongqing: Mt. Simian) (Fig. 28 ).

Habitat.

The species was collected by light trap close to an evergreen broadleaf forest. The main tree species in the collecting biotope are Engelhardia roxburghiana Wall.,1831 and 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.