Eversmannia atromarginata, Han & Han, 2025

Eversmannia atromarginata sp. nov.

Figs 1 View Figures 1–14 , 2 View Figures 1–14 , 15 View Figures 15–21 , 22 View Figures 22–28 , 31 View Figures 29–39

Epiplema bicaudata : Chu et al. 2004: 244–245, pl. 7: 8, fig. 172 (misidentification).

Material examined.

Holotype: China – Jiangxi Prov. • ♂; Huang’ao Country, Mt Jinggang, Xiaoxidong Forest farm ; 1 Jul. 2011; WC. Xie leg.; genit. prep. hmx- 152-1; SYSU . Paratypes: China – Jiangxi Prov. • 1 ♂; Huang’ao Country, Mt Jinggang, Liujiaping ; 4–5 Aug. 2024; HL. Han & LY. Ha & YY. Jin leg.; genit. prep. hmx- 232-1; NEFU . – Sichuan Prov., 1 ♀, Ya’an City , Baoxing County; 1 Aug. 2004; YD. Ren leg.; genit. prep. hmx- 130-2; NKU • 2 ♀♀, Ya’an City, Baoxing County, Fengtongzhai National Nature Reserve ; 3 Aug. 2004; YD. Ren leg.; genit. prep. hmx- 139-2; NKU . – Chongqing City, 1 ♀, Simianshan National Nature Reserve, Dawopu ; 4 May 2019; JJ. Fan & ZT. Wang leg.; genit. prep. hmx- 173-2; NEFU .

Diagnosis.

This new species is superficially similar to E. exornata ( Eversmann, 1837) but can be distinguished from the latter by the following characters: (1) forewing: subterminal and terminal areas covered with dark-brown patches; in E. exornata , these areas with scattered black and brown spots or a short band; (2) male genitalia: valva slightly narrower; aedeagus slightly slenderer; in E. exornata , valva broader; aedeagus thicker; (3) female genitalia: corpus bursae with three signa: two small signa at base of corpus bursae and one large signum at middle of corpus bursae; E. exornata with only one large signum.

Description.

Adult (Figs 1 View Figures 1–14 , 2 View Figures 1–14 , 31 View Figures 29–39 ). Forewing length: 8–10 mm in male, 8.5–10.5 mm in female. Head: white; labial palpus up-curved, brownish white; male antennae plumose, and female filiform. Thorax: patagium and tegula white. Abdomen: covered with white scales, segments A 1 and A 2 with grayish white. Forewing ground color white, with dark-brown band on the costal margin in the antemedial and basal line regions; antemedial line present, a brown dot at Cu 2 -1 A + 2 A in male, a thin rust-colored line in female; medial line absent; postmedial line double, rather dark brown, wavy, area between two lines filled with brownish red; subterminal line varies from dark brown to blackish brown; terminal and subterminal lines regions deeply gray in male, female same as ground color. Hindwing white; antemedial line rust-colored, discontinuous; postmedial line double, dark brown to dark reddish brown, wavy, prominently excurved at M 3, area between two lines filled with light brownish red, and with outer light brownish-red line in female; marginal shade brownish red, mixed with black in posterior half, but very thin or absent before Rs in male; Rs and M 3 with tails at outer margin; terminal line present as a small dot at M 3 - Cu 1 in female, but in male a short, slender, distinct black strip.

Male genitalia (Fig. 15 View Figures 15–21 ). Uncus hook-shaped, apex pointed, strongly sclerotized. Tegumen triangular approximately 2 × length of uncus. Gnathos sclerotized, trident-shaped, median process longest. Valva bar-shaped, covered with dense hair; sacculus arcuate, about 2 / 5 as long as valva; editum-costa complex bifurcate, one branch short and conical, other long and bar-shaped, and extending to the anterior of cucullus; cucullus, apex bluntly rounded; costa with weak bulge in middle; cucullus rounded, apex slightly enlarged. Juxta membranous, horseshoe-shaped, with a narrow V-shaped thin area at centre. Vinculum V-shaped. Saccus small and V-shaped. Aedeagus short and wide, slightly curved, cylindrical, with a small protuberance at middle coecum about 1 / 3 × the length of aedeagus. Vesica membranous, with a fruit-knife-shaped cornutus, and diverticula with graniculi.

Female genitalia (Fig. 22 View Figures 22–28 ). Papillae analis conical, covered with short setae. Apophysis posterioris slender, approximately 1.5 × length of apophysis anterioris. Ostium bursae like an inverted triangle, strongly sclerotized. Ductus bursae membranous, about 3 / 10 as long as corpus bursae. Corpus bursae membranous, densely covered with graniculi; tubular part funnel-shaped, gradually narrowing, with two small rectangular signa; globular part oval, with a large, sclerotized, durian-shaped signum.

Distribution.

China ( Shaanxi, Jiangxi, Chongqing, Sichuan) (Fig. 40 View Figure 40 ).

Etymology.

The species name atromarginata is from the Latin words “ atro ” and “ marginata ”, meaning black and margin and referring to the terminal subterminal line regions of the forewing which are covered with black patches.

Remarks.

Chu et al. (2004) misidentified this species as Epiplema bicaudata (Moore, [1868]) .