Nygmia linzhiensis Pan & Ouyang, 2025

Ouyang, Si-Qi, Zhang, Tong, Yu, Xia & Pan, Zhaohui, 2025, Two new species of the genus Nygmia Hübner, 1820 (Lepidoptera, Erebidae, Lymantriinae) from China, Zootaxa 5620 (4), pp. 589-594 : 589-591

Nygmia linzhiensis Pan & Ouyang , sp. nov.

Fig. 1–3 , 5 , 7–8 , 9–10

Type material. Holotype ( Figs 1 , 5 ): male, “STS-51141, Beibeng Township , Motuo County, Linzhi City, Xizang, China, N: 29°24.351′, E: 095°16.974′, 16-Ⅴ-2023, h [Altitude] 781 m (coll. Pan Zhaohui and Jiang Xinrui)” gen. prep. No. STS-51141 ( XAAHU).

Paratypes: 1 female, Beibeng Township , Motuo County, Linzhi City, Xizang, China, N:29°24.351′, E: 095°16.974′, 13-Ⅴ-2023, h [Altitude] 781 m (coll. Pan Zhaohui) ; 1 female, Motuo County, Linzhi City , Xizang, China, N:29°27.085′, E:095°32.815′, 29-Ⅹ-2011, h [Altitude] 1111 m (coll. Pan Zhaohui), unique numbers: STS-72861 , STS-19786 , gen. preps. in glycerol by Siqi Ouyang ( XAAHU) .

Diagnosis: Within the genus Nygmia , Nygmia linzhiensis sp. n. is only reminiscent of N. hanuman from Laos and N. postgrisea from Sundaland, but it can be distinguished from its congeners by the fewer brown scales on the forewing and the presence of a dark brown spot at the end of the discal cell. In the male genitalia, the new species can be distinguished from its congeners in the thickness of the distal saccular process and the broader saccus. The phallus structures display no significant difference from N. hanuman , but differs from N. postgrisea in that the distal section of the vesica covered by large cornuti field.

Description. Adult: Forewing length 41mm in males and 47 mm in females. Head. Antennae short and bipectinate. Head brown, frons yellow. Thorax. Pale yellow. Abdomen. Yellowish-brown in basal one third, brown in distal two thirds and with yellow tuft ditally. Forewing ground color yellow, irrorated with blackish brown scales from wing bas antemedial area; discal spot black; postmedial line broad and diffuse; two black spots present at the termen of spaces R 5 and M 1. Hindwing pale yellow with a black spot at the distal end of the discal cell and irrorated with blackish brown along inner margin. Female. Similar to male except antenna with shorter rami and hindwing with less blackish brown irroration.

Male genitalia: Uncus triangular with rod-like terminus. Tegumen trapezoidal. Saccus broad U-shaped. Valvae short and strongly sclerotized, basal saccular process blade like; medial saccular processes divided into a spike-like dorsal process medially with a short spine and a triangular ventral process; distal saccular process long and broad, curved medially and distally with a sharp end. Cucullus long and slender, membranous. Phallus cylindrical with triangular carinal plate. Vesica short, its main chamber and the distal diverticulum covered thoroughly by short cornuti.

Female genitalia: Papilla analis trapezoidal, with small distal triangular protrusion. Apophyses thin, apophysis anterioris thicker than apophysis posterioris and nearly of the same length. Postvaginal plate and antevaginal plate broand trapezoidal and medially concave. Ductus bursae sclerotized and rugose in its posterior end. Corpus bursae long pyriform with an oval signum.

Distribution. The new species is known only in Linzhi, Xizang, China (fig. 9, 10).

Etymology. The specific epithet linzhiensis is derived from the type locality, which is an adjective in the genitive.

Figures

FIGURE 9. The habitat of Nygmia spp.: China, Xizang, Linzhi City, Motuo County, Beibeng Township, N: 29°24.351′, E: 095°16.974′, 781 m, 16.Ⅴ. 2023 (photo by Pan Zhaohui).

FIGURE 10. The habitat of Nygmia spp.: China, Xizang, Linzhi City, Motuo County, N: 29°27.085′, E: 095°32.815′, 1111 m, 29. Ⅹ. 2011 (photo by Pan Zhaohui).

FIGURES 1–4. Nygmia spp., adults.Depositories of the specimens: 1–4 in XAAHU.

FIGURES 5–6. Nygmia spp., male genitalia. The specimens dissected are deposited in XAAHU.

FIGURES 7–8. Nygmia spp., female genitalia. The specimens dissected are deposited in XAAHU.