Nygmia damuensis Pan & Ouyang, 2025

Nygmia damuensis Pan & Ouyang , sp. nov.

Figs 7 View FIGURES 1-13 , 18 View FIGURES 14–21 .

Type material. Holotype ( Figs 7 View FIGURES 1-13 , 18 View FIGURES 14–21 ): male, “STS-86106, 80K, Damu Township , Motuo County, Linzhi City, Xizang, China, N: 29 °39ˊ4.5″, E: 94°42ˊ51.5″, 29-VII-2018, h [Altitude] 3932 m (coll. Pan Zhaohui)” gen. prep. No. STS-86106 ( XAAHU).

Diagnosis: Nygmia damuensis sp. nov. is reminiscent of N. quadrangularis , N. marginata , and N. insulata , but it can be clearly distinguished from its congeners by possessing a single black spot on the outer margin of the forewing (vs. five spots in N. quadrangularis , seven in N. marginata , and eight in N. insulata ). The male genitalia capsules are similar, but the new species can be differentiated by the narrow uncus with an elongated base, with a small, central, ridged protuberance at its base. In N. quadrangularis , the uncus base is semicircular and slightly broader, featuring a larger triangular central ridge at the base. Nygmia marginata exhibits a broadly rounded uncus base with a smaller triangular central ridge, while in N. insulata , the uncus base is wider, with prominently convex and enlarged lateral sides, and the central ridged protuberance is nearly bell-shaped at its base. In the new species, the cornuti cluster on the middle of the vesica are elliptical, and the sclerotized plates are semi-elliptical located at the distal end and upturned. The vesica of N. quadrangularis bears a pyramidal spinule cluster and a semi-oblong sclerotized plate, both connected at the middle portion, while in N. marginata bears a semi-elliptical spinule cluster in the middle portion and a tongue-like membranous structure at the distal end containing a semi-elliptical sclerotized plate and in N. insulata bears a single semicircular spine cluster distally at the phallus membrane, followed by a semicircular sclerotized plate.

Description. Adult. Male. Forewing length 51 mm.

Head: Antennae bipectinate, yellow with brown rami; Frons yellow (slightly brownish).

Thorax: yellow. Abdomen dorsally black; venter of abdomen dark yellow. Anal tufts yellow, slightly elongated. Forewing has a brown groundcolour with median portion, an irregular round spot, and marginal area pale yellow. A brown spot presented between veins M 1 and M 2, accompanied by a black punctate spot near marginal scales and parallel to the brown spot. Cilia yellow, interspersed with black scales between M 1 and M 2. Hindwings yellow, sparsely speckled with pale blackish-brown scales; marginal scales yellow.

Male genitalia: Uncus beak-shaped, broad at base, with a carinate ventrally. Valva rectangular tapering to apex, slightly longer than phallus, densely covered with long bristles; sacculus triangular and prominent. Saccus welldeveloped, tongue-shaped. Phallus with ventroapical depression. Vesica sack-like, with an upturned semi-elliptical sclerotized plate distally, a sub-oval cluster of dense cornuti medially, and a broad rectangular cluster of dense cornuti basally.

Female. Unknown.

Distribution. The new species is known only in Linzhi, Xizang, China.

Etymology. The specific epithet damuensis is derived from the type locality, Damu. An adjective in the nominative singular.