Eversmannia spiralis, Han & Han, 2025

Eversmannia spiralis sp. nov.

Figs 11 View Figures 1–14 , 12 View Figures 1–14 , 20 View Figures 15–21 , 27 View Figures 22–28 , 36 View Figures 29–39 , 37 View Figures 29–39

Material examined.

Holotype: China – Chongqing City • ♂; Simianshan National Nature Reserve ; 25 Apr. 2022; C. Zhang & XY. Zhang & D. Feng leg.; genit. prep. hmx- 248-1; NEFU . Paratypes: China – Chongqing City • 1 ♂; same collection data as the holotype; genit. prep. hmx- 250-1; NEFU • 2 ♀♀; Simianshan Town, Dawopu ; 7 May 2019; JJ. Fan & ZT. Wang leg.; genit. prep. hmx- 171-2, hmx- 172-2; NEFU • 1 ♀; same collection data as for preceding; 4 May 2019; genit. prep. hmx- 191-2; NEFU .

Diagnosis.

This new species can be easily distinguished from other species of the genus by the following characters: (1) forewing: with a big dark brown semicircle shaped patch at terminal area near apex; in other species only with small spots or patches near apex. (2) Male genitalia: the caecum of aedeagus strongly expanded; in other species the caecum is straight or slightly expanded. (3) Female genitalia: the ductus bursae is spiral shaped, signum absent; in other species the ductus bursae is slightly curved; signum absent.

Description.

Adult. (Fig. 11 View Figures 1–14 , 12 View Figures 1–14 , 36 View Figures 29–39 , 37 View Figures 29–39 ). Forewing length: 8.0– 8.5 mm in male, 8.0– 9.5 mm in female. Head: brownish mixed with white; labial palpus up-curved, dark brown; antennae filiform. Thorax: patagium and tegula white. Abdomen: covered with white scales. Forewing ground color white, with brown band on costal margin in antemedial and basal line regions; antemedial line pale brown, discontinuous; medial line absent; postmedial line present as pale-brown spots, barely visible; terminal area with a large dark-brown semicircular patch at R 4 - Cu 1. Hindwing white; antemedial line pale brown, discontinuous; postmedial line double, pale brown, wavy, discontinuous, blurred, area between the two lines filled with light reddish brown; marginal shade brownish red, in posterior half; Rs and M 3 with tails at outer margin; terminal line present as a small dot at M 3 - Cu 1.

Male genitalia (Fig. 20 View Figures 15–21 ). Uncus long hook-shaped, apex pointed, strongly sclerotized. Gnathos sclerotized, present as two spikes. Tegumen triangular, approximately 1.5 × length of uncus. Valva bar-shaped, covered with dense hair; sacculus arcuate, about as 1 / 4 long as valva; editum-costa complex bifurcate, one branch short, finger-shaped and covered with long hair, other branch long, bar-shaped, and extending to anterior of cucullus; costa extended in front part; cucullus rounded, slightly enlarged apical. Juxta membranous, water-chestnut-shaped. Vinculum broad V-shaped. Saccus V-shaped. Aedeagus bow-shaped; caecum strongly expanded, about 1 / 2 × length of aedeagus. Vesica membranous, with bunch of spine-shaped cornutus, and diverticula with graniculi.

Female genitalia (Fig. 27 View Figures 22–28 ). Papillae anales hoof-shaped, densely covered with short setae. Apophysis posterioris slender, approximately 1.5 × length of apophysis anterioris. Ostium bursae flat, slightly sclerotized. Ductus bursae slender, membranous, spiral, about as long as corpus bursae. Corpus bursae membranous, long-drop-shaped, moderately curved, slightly sclerotized at the base, signum absent.

Distribution.

China ( Zhejiang, Chongqing, Guizhou) (Fig. 40 View Figure 40 ).

Etymology.

The species name is from the Latin word “ spiralis ”, meaning spiraling, referring to the spiral corpus bursae.