Dichomeris acutivalvata Park & Li

Zhao, Shengnan, Park, Kyu-Tek, Bae, Yang-Seop & Li, Houhun, 2017, Dichomeris Hübner, 1818 (Lepidoptera, Gelechiidae, Dichomeridinae) from Cambodia, including associated Chinese species, Zootaxa 4273 (2), pp. 216-234 : 227-234

Dichomeris acutivalvata Park & Li , sp. nov.

Figs 13 , 26 .

Type material. Holotype ♂, CAMBODIA: Kep, 160 m, 11.ii.2015, leg. Y. S. Bae et al., genitalia slide No. CIS- 6693 . Paratype: 1♂, same data as for holotype, genitalia slide No. CIS-6684 ( INU) .

Diagnosis. This species is superficially similar to D. ustalella ( Fabricius, 1794) . It can be distingulished from D. ustalella by the forewing with two faint spots; and by the elongate uncus about equal to length of the tegumen, the lateral lobes of the vinculum arising from the corner between the vinculum arm and the saccal region, and the aedeagus with one sclerotized lobe from the zone ( Fig. 26 ). In D. ustalella , the forewing has no spot, the relatively short uncus is about half the length of the tegumen, the lateral lobes arise from basal 1/3 of the vinculum arm, and the aedeagus has two sclerotized lobes from the zone ( Li 2002: 398, Figs 450, Pl. 29: Fig. 232).

Description. Adult ( Fig. 13 ) wingspan 20.0 mm. Head dark brown, frons greyish brown. Ocelli present. Antenna with scape dark brown on dorsal surface, yellowish white on ventral surface; flagellum dark brown ringed with yellowish brown on dorsal surface, yellowish brown on ventral surface. Labial palpus with first and second segments dark brown on outer surface, pale yellow on inner surface; second segment with greyish white-tipped triangular scale tuft on dorsal surface; third segment smoothly scaled, longer than second segment, yellow except brown on ventral surface. Thorax and tegula dark brown; mesothorax without hair pencils arising from anepisternum in male. Forewing narrow at base, slightly broadening to basal 1/3, subparallel in distal 2/3, apex acute, termen truncate; dark brown except yellow along costal margin; discocellular represented by a small blackish brown spot; faint plical spot blackish brown, at middle of fold; fringe dark brown in basal half, yellowish brown in distal half, dark brown around tornus. Hindwing and fringe brown. Fore- and midlegs blackish brown on outer surface, yellow on inner surface, tarsi with each tarsomere yellow at apex on outer surface; hindleg with femur and tibia brown on outer surface, yellow on inner surface, tarsus yellow, tibia clothed with long yellow scales.

Male genitalia ( Fig. 26 ). Uncus elongate, about equal to length of tegumen, concave in anterior half ventrally, bluntly rounded on posterior margin, sparsely setose on ventral surface. Gnathos slender, arched; culcitula small, inverted triangular. Valva slender, about 4/5 length of tegumen-uncus complex, clavate, distal 1/3 inflated before sharp apex; valvella clavate, about 2/3 length of valva, setose in distal half. Setose patch absent. Vinculum approximately as high as length of tegumen-uncus complex, sinuate; lateral lobes arising from corner between vinculum arm and saccal region, very slender, sharp at apex, asymmetrical in length: left lobe longer, exceeding base of gnathos apically, right lobe about 3/5 length of left one. Saccal region narrow, deeply concave in broad triangle on anterior margin. Sicae weakly sclerotized, about half length of vinculum arm, subtrapezoidal, slightly concave near middle from left side on posterior margin. Aedeagus narrowest at cecum, broadest at zone, gradually narrowed from zone to apex; one heavily sclerotized lobe from zone, reaching apex of aedeagus, its basal 2/3 parallel-sided, abruptly invaginate at basal 1/3, width of median 1/3 approximately half of basal 1/3, distal 1/3 narrowed to sharp apex.

Female unknown.

Distribution. Cambodia (Kep).

Etymology. The specific name is derived from the Latin acutus and valvatus, referring to the apically sharpened valva.

Figures

FIGURES 8 – 13. Adults of Dichomeris spp. 8, D. magnimacularis sp. nov., paratype, male; 9, D. hainanensis sp. nov., paratype, male; 10, D. microsphena Meyrick, male; 11, D. cambodiensis sp. nov., holotype, male; 12, D. matsumurai Ponomarenko & Ueda, female; 13, Dichomeris acutivalvata sp. nov., holotype, male. Scales = 5.0 mm.

FIGURES 26 – 30. Male and female genitalia of Dichomeris spp. 26, Male genitalia of Dichomeris acutivalvata sp. nov., holotype, genitalia slide No. 6693. 27 – 30. Female genitalia: 27, D. orientis Park & Hodges, genitalia slide No. ZSN 16031; 28, D. foliforma, sp. nov., paratype, genitalia slide No. ZSN 15346; 29, D. fuscusitis Li & Zheng, genitalia slide No. ZSN 15369; 30, D. obsepta (Meyrick), genitalia slide No. ZSN 15371. Scales = 1.0 mm.