Diduga chewi, 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 chewi sp. nov. Figs 7 , 8 , 18 , 25 , 28

Material examined.

Holotype: Malaysia: ♂, Sabah, Borneo Jungle Girl Camp; 5.442°N, 116.451°E, elevation 1223 m; 15-20.II.2019; leg. H. L. Han; genit. prep. no. ztt-110-1; in NEFU. Paratypes: 1♂, 2♀♀; same data as holotype; genit. prep. nos. ztt-100-1, ztt-102-2, ztt-040-2; in NEFU.

Diagnosis.

The wing pattern of the new species is similar to that of D. trichophora Hampson, 1900 (Figs 9 , 19 ). It can be separated from the latter by the following characters ( D. trichophora details are between parentheses): the forewing is broader (narrow); the male hindwing is dark grey, broad fan-shaped (pale, narrow fan-shaped); in the male genitalia, the valva termination bifurcated distally (finger-shaped, sharp distally); the coecum is typical (bifurcated); the vesica has long, narrow band of flecks (without).

Description.

Adult (Figs 7 , 8 ). Wingspan 15.5-16.5 mm. Head yellow; antenna filiform. Thorax dark brown; patagium, and tegula yellow. Abdomen dark to brown, the latter with pale yellow anal tuft. Forewing with dark brown ground color; veins and inner margin more black; costa slightly angled at 1/4 of the wing; costal band broad, yellow, with several dots and patches; its inner edge undulated; terminal band of same color as costal one, with internally facing concavity at tornus, the inner edge of terminal band undulated; terminal line and fringe yellow; ventral side of inner margin with long, brown hair tuft. Hindwing dark grey to smoky brown; costa with longer scales in male; tornus area sunken; fringe brown. Male genitalia (Fig. 18 ). Tegumen triangular, weakly sclerotized, slightly longer than uncus. Vinculum U-shaped, sclerotized. Juxta large, linguliform, weakly sclerotized, inverted harpoon-shaped. Valva approximately diamond-shaped, rather flat and symmetrical; sacculus narrow, thick and straight, 2/3 as long as valva, this terminated by long straight, sharply pointed process slightly bifurcated before apex. Uncus hooked and slender, sharp distally. Aedeagus curved, short, thick; caecum slightly swollen, ca 1/4 as long as whole aedeagus; vesica with a long cornutus and a scobinate band medially. Female genitalia (Fig. 25 ). Ostium bursae infundibuliform, weakly sclerotized. Ductus bursae narrow, flat, moderately sclerotized, sinuous anteriorly. Corpus bursae globular, membranous, with a ring-shaped signum band covered by small spines and flecks. Base of apophysis anterior is a long, inverted triangle; apophysis posterior slender, long, slightly longer than apophysis anterior; Papillae anales cylindrical, weakly sclerotized, covered with setae.

Etymology.

The name " chewi " refers to Mr J. Chew, who is a person in charge in the camp site where the species was collected.

Distribution.

Malaysia (Borneo: Sabah) (Fig. 28 ).

Habitat.

The species was collected in a tropical rain forest area. Podocarpaceae and Myrtaceae are richest families in the collecting biotope, and mosses such as Himantocladium plumula (Nees) Fleisch., 1908, Hypopterygium tamarisci Bridel ex C. Müller, 1850, Fissidens wichurae Broth. & Fleisch., 1899 are also abundant.

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 7 - 12. Adults of Diduga spp. 7 D. chewi sp. nov., male, holotype, Malaysia (Borneo) 8 ditto, female, paratype, Malaysia (Borneo) 9 D. trichophora, male (after Bucsek 2012) 10 D. kohkongensis, male (after Bayarsaikhan & Bae, 2018) 11 D. hollowayi sp. nov., male, holotype, Malaysia (Borneo) 12 ditto, female, paratype, Malaysia (Borneo).

Figures 18 - 21. Male genitalia of Diduga spp. 18 D. chewi sp. nov., holotype, genit. prep. No. ztt- 110 - 1 19 D. trichophora (after Bucsek 2012) 20 D. hollowayi sp. nov., holotype, genit. prep. No. ztt- 033 - 1 21 D. kohkongensis (after Bayarsaikhan & Bae, 2018). 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.