Ressia sinevi Li, 2023

Zhang, Di & Li, Houhun, 2023, Review of the genus Ressia Sinev, 1988 (Lepidoptera: Cosmopterigidae), with descriptions of four new species from China, Zootaxa 5360 (4), pp. 583-592 : 589-591

Ressia sinevi Li , sp. nov.

( Figs 8 , 14 , 19 )

urn:lsid:zoobank.org:act:D1FBC5F8-D3DE-4BC2-A218-C14F44E16223

Type material. Holotype ♁. CHINA, Sichuan: Hailuogou , Luding County (29.60°N, 102.10°E), 1695 m, 1.VII.2016, leg. KJ Teng & XF Yang, slide No. ZD 21576.

Paratypes: 3♁ 5♀, Hailuogou , Luding County (29.60°N, 102.10°E), 1695 m, 30.VI–1.VII.2016, leg. KJ Teng & XF Yang, slide No. ZD 21585 ♀.

Diagnosis. The new species is similar to R. forcipata sp. nov. in the shape of the valva, the valvella and the phallus. It can be distinguished by the markings of the forewing without metallic luster, and by the symmetrical pleural lobes of the male eighth segment. In forcipata sp. nov., the markings of the forewing possess a pale bluish-metallic luster, and the pleural lobes of the eighth segment are asymmetrical.

Description. Adult ( Fig. 8 ). Wingspan 11.0–13.0 mm.

Head. Vertex dark brown, frons grayish yellow. Antenna with scape dark brown dorsally, grayish yellow ventrally; flagellum grayish yellow, annulated with dark brown in basal 2/3 dorsally. Labial palpus dark brown, except third palpomere yellow dorsally.

Thorax. Dorsum of mesothorax and tegula dark brown. Forewing dark brown; markings white: subbasal fascia almost uniformly narrow, extending from basal 1/5 of costal margin to dorsum; irregularly shaped spot at 1/2 and 3/5 of costal margin respectively, banded speckle at end of fold; fringe dark brown, tinged with white around apex. Hindwing and fringe dark brown. Fore- and midlegs dark brown, except coxae and femora yellowish white dorsally; hindleg with femur and tibia dark brown on outer surface, yellowish white on inner surface, tibia yellowish white at 1/2 and apex, tarsus with 1–2 tarsomeres dark brown, first tarsomere ringed with yellowish white at base and apex, 3–5 tarsomeres white.

Male abdomen and genitalia ( Fig. 14 ):

Abdomen. Furcate process of eighth tergum narrowed towards pointed apex, sclerotized and straight on inner margin. Pleural lobes of eighth segment narrow at base, widened to almost straight apex.

Male genitalia. Socus with left brachium spatulate, about 1/3 length of right brachium; right brachium with basal 1/3 wide, distal 2/3 slender, pointed at apex. Valva with stalk uniformly wide; cucullus subelliptical, densely setose on ventral surface. Left valvella slender, curved at middle, inflated from subapex to apex, with setae ventrodistally. Phallus slightly narrower distally, bent before obtuse apex.

Female genitalia ( Fig. 19 ). Apophyses posteriores about 1.5 times length of apophyses anteriores. Sterigma subtrapezoidal, with a sclerotized ventral sac. Antrum short, funnel-shaped. Ductus bursae membranous, twice as long as apophyses posteriores. Corpus bursae spherical, slightly longer than apophyses posteriores; signum absent.

Distribution. China (Sichuan).

Etymology. The species is named after the famous Russian entomologist Dr. S. Yu. Sinev in recognition of his contribution to the study of the family Cosmopterigidae .

Figures

FIGURES 3‒8. Adults (all males) of Ressia spp. 3. R. auriculata; 4. R. disparilis sp. nov., holotype; 5. R. forcipata sp. nov., holotype; 6. R. quercidentella; 7. R. semilunata sp. nov., holotype; 8. R. sinevi sp. nov., holotype. Scales = 2.0 mm.

FIGURES 9‒14. Structure of 8th abdominal segment and male genitalia of Ressia spp. 9. R. auriculata, slide No. ZD21583; 10. R. disparilis sp. nov., holotype, slide No. ZD21076; 11. R. forcipata sp. nov., holotype, slide No. ZD21568; 12. R.quercidentella, slide No. ZD21160; 13. R. semilunata sp. nov., holotype, slide No. ZD21571; 14. R. sinevi sp. nov., holotype, slide No. ZD21576 (9a–14a, furcate process of eighth tergum). Scales = 0.5 mm (9a–14a = 0.2 mm).

FIGURES 15‒19. Female genitalia of Ressia spp. 15. R. auriculata, paratype, slide No. ZZW08911; 16. R. disparilis sp. nov., paratype, slide No. ZD21584; 17. R. quercidentella, slide No. ZD21578; 18. R. semilunata sp. nov., paratype, slide No. ZD21582; 19. R. sinevi sp. nov., paratype, slide No. ZD21585. Scales = 0.5 mm.