Thysanoplisna grandimacula Volynkin, 2024, sp. nov.

Thysanoplisna grandimacula sp. nov. (Figs 13–16, 44, 45, 59, 60) Type material. Holotype (Figs 13, 44): ♂, “N-Vietnam 1600m | [Lào Cai Province] Mt. Fan-si-pan(Nord) | Cha-pa, Primärurwald [primary jungle] | 22.17''N 103.44''E [22°17'N 103°44'E] | 20.–30.IV.1995 | leg. V. Sinjaev [Sinyaev] & | Einheim. Sammler [native collector]” | vertical inscription “ Museum Witt ” / “ Genitalpräparat | Heterocera | Nr. 36.023 | Museum WITT München ” (MWM/ ZSM). Paratypes. VIETNAM: 89 ♂♂, 70 ♀♀, same data as holotype, gen. prep. Nos.: MWM 35.960, 35.962, 35.963, 36.024 (♂♂), 35.961, 36.025 (♀♀); 1 ♀, [Lào Cai Province] 1600–1800m, Mt. Fan-si-pan (west), Cha-pa (= Sapa), 22°20'N 103°40'E, ix.1994 (secondary forest), Mong leg.; 17 ♂♂, 8 ♀♀, [Tuyên Quang Province] Tam Dao (secondary forest), 60 km NW of Hanoi, 950m, 21°34'N 105°20'E, iv.1995, V. Sinyaev leg., gen. prep. No.: MWM 36.028 (♀); 1 ♀, Tuyên Quang Prov., Na Hang Nature Reserve, 300m, 22°03'N 105°05'E, 22.ii.–5.iii.1997, G. Csorba leg. (all in MWM/ ZSM). Diagnosis. The forewing length is 15.5–18.0 mm in males and 18.5–19.0 mm in females. Thysanoplisna grandimacula sp. nov. superficially differs from the similar Th. brevimacula and Th. signata in the markedly longer medial spot on the forewing. The male genital capsule of Th. grandimacula sp. nov. can be distinguished from Th. brevimacula and Th. signata by the somewhat more rounded vinculum and the slightly straighter distal saccular process. The phallus of the new species is longer and broader than in the similar species. Compared to Th. brevimacula and Th. signata, the vesica of Th. grandimacula sp. nov. is considerably broader and somewhat longer, has a shorter basal diverticulum, broader subbasal diverticula, a longer and bilobate dorsal medial diverticulum, a bilobate (foot-shaped) ventral medial diverticulum, and bears a longer and thicker cornutus. The female genitalia of Th. grandimacula sp. nov. are distinguished from Th. brevimacula and Th. signata by the anteriorly broader and more posteriorly tapered ductus bursae, the markedly broader posterior gelatinous enlargement of the corpus bursae bearing a large and heavily sclerotised lateral plate, and the shorter and distally narrower appendix bursae. Distribution. Northern Vietnam (Lào Cai and Tuyên Quang Provinces). Etymology. The specific epithet is derived from the Latin ‘grandis’ and ‘macula’ meaning ‘large’ and ‘spot’, respectively, and refers to the medial spot of the forewing, which is larger than in similar species. The name is a noun in the nominative singular in apposition.