Arctornis lingnana Yuan & Wang, 2025

Arctornis lingnana Yuan & Wang View in CoL sp. nov.

Diagnosis. The new species can be easily distinguished from all other congeners by the valva having a short fingerlike process at the dorsal base, and a long clavate process extending from the ventral base to the cucullus.

Description. Adults ( Figs. 1–2, 5, 7 View FIGURES 1–8 ). Forewing length: 14–18 mm in males; 18–22 mm in females. Frons and vertex covered with dark orange hairs. Labial palpus orange. Antenna bipectinate, stronger in males than in females, pale orange. Thorax and abdomen white. Forewing and hindwing white, with brown hairs on termen in males. Forewing costa orange about distal 1/4. Wing venation light green, forewings with vein R 3, R 4 and R 5 stalked, R 5 and M 1 almost parallel, M 2 and M 3 originating from the lower angle of discal cell; hindwing with R s and M 1 stalked, M 2 present. Legs white, with orange hairs terminally; hindlegs with a pair of white tibial spurs.

Male genitalia ( Fig. 9 View FIGURES 9–11 ). Uncus short, digitate, pointed apically. Valva broad, elongate, folded inward at dorsum, with a short fingerlike process at dorsal base, a long clavate process from ventral base extending to cucullus; cucullus concaved inward at ventral half, dentate and strongly sclerotized at outer edge of dorsal half. Aedeagus short, more sclerotized distally.

Female genitalia ( Fig. 11 View FIGURES 9–11 ). Papillae anales strongly sclerotized, finger-shaped, curved medially. Apophyses anteriores short, apophyses posteriores reduced. Ostium V-shaped, sclerotized. Ductus relatively long, membranous. Bursa nearly elliptical, with numerous stripe-like wrinkles, signum large, densely covered with tiny thorns.

Larvae ( Figs. 12–18 View FIGURES 12–19 ). First instar body length 3 mm; yellow green dorsally, dark brown laterally; thoracic verrucae white; A2, A5 and A9 with white verrucae. Second, third and fourth instars with black body coloration; thoracic verrucae orange in second instar, dark orange in third instar, black in fourth instar; abdominal verrucae white on A2 and A5 of instars 2–4, orange or black on A9 of the third and fourth instars; A3–5 with orange and black short brushes. Fifth instar body length 28 mm, ochre in ground color, with white stripes on thorax and abdomen; cephalic capsule black, clypeus white, labial, and antenna orange; each segment with a pair of orange lateral verrucae; brushes of A3–5 and A9 orange, but mixed with black color; middorsal gland white in all instars.

Pupae ( Fig. 19 View FIGURES 12–19 ). Green, with a small yellow dot near spiracle on A2–A5.

Host-plant. Castanopsis fissa . (Champ. ex Benth.) Rehd. et Wils. ( Fagaceae ).

Type material. Holotype: ♂, Fenghuangshan Provincial Nature Reserve , Chaozhou, Guangdong, China, 23º53’3.5376” N, 116º35’46.896” E, altitude 600 m, 1-V-2024, leg. Ziqi Yuan. GoogleMaps Paratypes: 4♂, 2♀, same collecting data as holotype GoogleMaps .

Distribution. China (Guangdong).

Etymology. The new species is named after Lingnan, an area to the south of Wu Ling mountains in China.