Dichomeris quadratella Park & Li, 2020

Park, Kyu-Tek, Bae, Yang-Seop, Zhao, Shengnan & Li, Houhun, 2020, Thirteen new species of genera Dichomeris Hübner, 1818 and Helcystogramma Zeller, 1877 (Lepidoptera, Gelechiidae, Dichomeridinae) with twenty-one newly recorded species from Vietnam, Zootaxa 4821 (3), pp. 435-461 : 442-443

Dichomeris quadratella Park & Li , sp. nov.

urn:lsid:zoobank.org:act:B27B8C8D-2444-4EA2-9543-E767D655371F

( Figs 23 , 43 )

Type material. Holotype ♂, VIETNAM: Ninh Binh Prov.: Cuc Phuong Nat. Park , 200 m, 23 iv 2006, leg. Park, Kim & Kang, gen. slide no. CIS-6307 . Paratypes: Ninh Binh Prov.: 1♂, same as holotype, 22 iv 2006, gen. slide no. CIS-6285 ; 1♂, same locality as holotype, 450 m, 14 vi 2004, leg. KT Park & N Cuong, gen. slide no. CIS-6678. All types in NIBR .

Description. Adult ( Fig. 23 ). Wingspan 14.5–15.0 mm. Head dark brown dorsally; frons gray. Ocellus absent. Antenna with scape dark brown dorsally, pale yellow ventrally; flagellum dark bown dorsally, yellowish brown ventrally, ciliate. Second segment of labial palpus dark brown on outer surface, grayish on inner surface, clothed with rough scales above; 3rd segment thickened, shorter than 2nd segment, dark brown, with rough scales above. Thorax and tegula dark brown; mesothoracic anepisternum without hair-pencils in male. Fore- and midleg dark brown except tarsomeres grayish yellow apically on outer surface, yellowish white on inner surface; hindleg pale yellow, mixed with dark-brown scales on outer surface, tibia clothed with long, yellow scales, tarsus with each tarsomere pale yellow apically. Forewing slightly broadened distally; ground color pale yellow, scattered with dark-brown scales; costa with dark-brown streak along margin from base to 4/5; with dark-brown, distinct discal and discocellular spots at middle and end of cell; broad dark-brown fascia presented along dorsum, extending to 4/5 of dorsum; a large, quadrate, dark-brown patch well-developed along termen from beyond apex to tornus; apex acute; termen obliquely straight; fringe dark brown, with pale yellow basal line. Hind wing brownish gray; fringe concolorous with ground color.

Male genitalia ( Fig. 43 ): Uncus nearly rectangular, with rounded posterior margin, with a longitudinal ridge medially; anterior margin deeply concave in semicircular. Gnathos long, heavily sclerotized, strongly bent at basal 1/3, sharp at apex; culcitula semicircular, densely spinose, with a rounded process mesially on posterior margin. Valva slightly longer than tegumen plus uncus, narrowed in basal half, broadened distally, rounded at apex; valvella large, spatulate, about 2/5 the length of valva, with rounded apex. Setose patch small, columnar, inflated distally. Vinculum broad in anterior base, almost at right angles with lateral lobes; lateral lobes arising from middle, about 1/2 the length of vinculum, broadly banded; distal 1/5 bifurcate; apex acute. Saccal region narrow, nearly straight on anterior margin. Sicae with a pair of long, symmetrical lobes, fused for short distance, gradually narrowed to rounded apex, slightly exceeding base of vinculum. Aedeagus longer, 1.2 times as long as valva; triangularly produced at base, slightly narrowed beyond half; two short, weakly sclerotized bars placed beyond middle.

Female unknown.

Distribution. Vietnam (Ninh Binh).

Diagnosis. This species is superficially similar to Dichomeris obsepta ( Meyrick, 1935) , but it can be separated from the latter by having symmetrical lateral lobes in the vinculum, the symmetrical sicae, whereas in Dichomeris obsepta , lobes of the vinculum and the sicae are asymmetrical.

Etymology. The specific name is derived from the Latin, -quadrat (= quadrate), and - ellus (= small), referring to the rectangula valvella.

Figures

FIGURES 17–24. Adults. 17. Dichomeris ochriella sp. nov., holotype, male; 18. D. orientis Park & Hodges, male; 19. D. parallelosa Park & Ponomarenko, male; 20. D. parvisexafurca Li, Zhen & Kendrick, male; 21. D. myriaodontosa sp. nov., holotype, male; 22. D. polygona Li & Zheng, male; 23. D. quadratella sp. nov., holotype, male; 24. D. quadrifurca Li & Zheng, male. Scales = 5.0 mm.

FIGURES 41–46. Male genitalia. 41. Dichomeris ochriella sp. nov., holotype, gen. slide no. CIS-6277; 42. D. myriaodontosa sp. nov., holotype, gen. slide no. CIS-6675; 43. D. quadratella sp. nov., paratype, gen. slide no. CIS-6285; 44. D. sclerospinula sp. nov., paratype, gen. slide no. NKLEP059; 45. D. spinosella sp. nov., holotype, gen. slide no. NKLEP003; 46. D. unilobata sp. nov., holotype, gen. slide no. CIS-6320. Scales = 0.5 mm.