Dichomeris foliforma Li & Park

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 : 221-222

Dichomeris foliforma Li & Park , sp. nov.

Figs 5 , 18 , 28 .

Type material. Holotype ♂, CHINA: Mt. Pinglong (22°09'N, 107°58'E), Shangsi , Guangxi Zhuangzu Autonomous Region, 510 m, 6.iv.2002, leg. Shulian Hao and Huaijun Xue, genitalia slide No. ZH 06329 ( NKU) . Paratypes: CHINA: Guangxi Province: 1♂, same data as for holotype ; 2♂, Hekou (23°58'N, 110°07'E), Jinxiu , 650 m, 28.iv.2008, leg. Hui Zhen and Li Zhang; Hainan Province : 11♂, Tianchi (18°44'N, 108°52'E), Jianfengling , 787 m, 11–15.vii.2015, leg. Qingyun Wang, Suran Li and Mengting Chen, genitalia slide Nos. ZSN16117, ZSN16123, ZSN16124, ZSN16129, ZSN16130, ZSN16131 ; 6♂, Tianchi, Jianfengling , 787 m, 5– 10.iii.2016, leg. Qingyun Wang, Suran Li and Shengnan Zhao, genitalia slide Nos. ZSN16141, ZSN16149, ZSN16153, ZSN16157, ZSN16159 ; 2♂, 1♀, Jianfengling Nature Reserves (18°26'N, 108°31'E), Ledong , 770 m, 28.v.2015, leg. Peixin Cong, Wei Guan and Sha Hu, genitalia slide Nos. ZSN16138, ZSN16239, ZSN16134 ; 2♂, Limushan National Forest Park (19°06'N, 109°26'E), 607 m, 13.v.2015, leg. Peixin Cong, Wei Guan and Sha Hu, genitalia slide No. ZSN16132 ; 6♂, Mt. Diaoluo (18°23'N, 109°32'E), 940 m, 31.v–2.iv.2007, leg. Zhiwei Zhang and Weichun Li ; 1♂, Diaoluoshan Nature Reserves (18°43'N, 109°52'E), Lingshui , 980 m, 24.iv.2014, leg. Tengteng Liu, Wei Guan and Xuemei Hu, genitalia slide No. ZSN16118 ; 2♂, Diaoluoshan Nature Reserves (18°25'N, 109°31'E), 922 m, 26–27.v.2015, leg. Peixin Cong, Wei Guan and Sha Hu, genitalia slide No. ZSN16133 ; 1♂, Wuzhishan Nature Reserves (18°31'N, 109°23'E), 742 m, 22.v.2015, leg. Peixin Cong, Wei Guan and Sha Hu ( NKU); Zhejiang Province : 1♀, Huangtanyu (28°23'N, 118°50'E), Mt. Jiulong , 467 m, 6.vii.2013, leg. Aihui Yin and Xiuchun Wang, genitalia slide No. ZSN15346 ; CAMBODIA: 1♂, Samkos (12°12'N, 102°52'E), 23.xii.2014, leg. Y. S. Bae et al., genitalia slide No. CIS-6708 ( INU).

Diagnosis. This new species is similar to D. bifurca Li & Zheng, 1996 superficially. It can be separated from D. bifurca by having stout asymmetrical sicae with small teeth on the ventral surface near the outer margin, the lateral lobes of the vinculum with small teeth at the apex and along distal 1/3 of the outer margin in the male genitalia, and by the signum placed at the right side of the corpus bursae medially in the female genitalia. In D. bifurca , the slender symmetrical sicae do not have teeth on the ventral surface, the lateral lobes of the vinculum are smooth at the apex and along the outer margin, and the signum is placed at the anterior part of the corpus bursae ( Li & Zheng, 1996: 251, Figs 78, 79).

Description. Adult ( Fig. 5 ) wingspan 13.0–14.0 mm. Head pale yellow to yellow, grey medially. Ocellus absent. Labial palpus with second segment about twice length of diameter of eye; first and second segments with outer surface dark brown, inner surface yellowish white except ochreous or brown near ventral surface; third segment dark brown except yellowish white apically, sometimes silvery white on inner surface. Antenna with scape greyish brown to dark brown on dorsal surface, yellowish white on ventral surface; flagellum alternately greyish yellow and dark brown on dorsal surface, pale ochreous on ventral surface. Thorax greyish brown medially, pale yellow to yellow laterally; tegula pale yellow to yellow; mesothorax with pale yellow hair pencils from anepisternum in male. Forewing with costal margin almost straight, apex sharp, termen obliquely straight; ground color pale yellow to yellow, with scattered dark brown scales; costal margin dark brown, with short yellow streak at distal 1/5; longitudinal blackish brown stripe from middle of cell to termen, widening from outer margin of cell; fold dark brown except at base; dorsum dark brown; large parallel quadrilateral blackish brown patch along termen; termen blackish brown; fringe yellow to ochreous yellow except dark brown along dorsum. Hindwing and fringe grey. Fore- and midlegs dark brown on outer surface, femora greyish white, tibiae and tarsi yellowish white on inner surface; hindleg with femur silvery white, tibia yellowish white, mixed with greyish brown on outer surface, tarsus greyish brown on outer surface except tarsomeres yellowish white apically, yellowish white on inner surface.

Male genitalia ( Fig. 18 ). Uncus subovate, slightly narrowed near base, anterior margin broadly concave inward on ventral surface, posterior margin bluntly rounded. Gnathos rather long, curved at basal 1/3; culcitula semicircular, with semicircular process posteriorly. Valva about as long as tegumen-uncus complex, almost uniform in basal 2/3 except gently concave at 2/5 on dorsal margin, slightly broadened in distal 1/3, broadly rounded at apex; valvella about 1/3 length of valva, stout, clavate, with sparse setae in distal half. Setose patch columnar. Vinculum height less than length of tegumen-uncus complex, distal 1/5 narrowed; lateral lobe arising from basal 3/4 of vinculum arm, digitate, slightly shorter than 1/2 length of valva, with small teeth at apex and along distal 1/3 of ventral margin, ventral surface spinous, apex with sparse setae, left lobe with a large marginally dentate lobe at base. Saccal region with anterior margin almost straight. Sicae stout and short, about 1/3 length of vinculum arm, widely fused at base, deeply concave in U shape; lateral lobes with small teeth on ventral surface and along outer margin, asymmetrical: left lobe elongate triangular, narrowed to apex, right lobe sub-rectangular, bifurcate apically. Aedeagus globular at base, gradually narrowed to apex; two sclerotized lateral lobes from zone, about 1/4 length of aedeagus, dentate marginally, asymmetrical: left lobe foliiform, right lobe triangular.

Female genitalia ( Fig. 28 ). Apophyses anteriores slightly thinned to sharp apex, about 2/5 length of apophyses posteriores. Eighth tergite gently arched on posterior margin. Antrum rectangular, width approximately four times of length. Ductus bursae sclerotized except basal 1/5 membranous; two longitudinal sclerotized slender bands from before middle extending backward to near posterior margin of antrum; basal 1/3 broad, with lateral processes arising at basal 1/3: left process elongate, reaching near corpus bursae, membranous, right process triangular, reaching distal 1/3 of ductus bursae, sclerotized; distal 2/3 narrower, with one sclerotized plate, its left side extending to posterior 2/5 of corpus bursae, forming a band narrowed to apex; ductus seminalis arising from distal 1/3 of ductus bursae at left side. Corpus bursae large, rounded, densely spinous on inner surface; signum illdefined, placed at middle at right side.

Distribution. Cambodia (Pursat), China (Guangxi, Hainan, Zhejiang).

Etymology. The specific name is derived from the Latin folium and forma, referring to the sclerotized leaf-like left lobe from the zone of the aedeagus.

Figures

FIGURES 1 – 7. Adults of Dichomeris spp. 1, D. arcuata sp. nov., holotype, male; 2, D. splendiptera, sp. nov., paratype, male; 3, D. orientis Park & Hodges, male; 4, D. samkosensis sp. nov., holotype, male; 5, D. foliforma, sp. nov., paratype, male; 6, D. fuscusitis Li & Zheng, female; 7, D. obsepta (Meyrick), male; 7 a, Male foreleg of D. obsepta (Meyrick). Scales: 1 – 7 = 5.0 mm; 7 a = 2.5 mm.

FIGURES 14 – 19. Male genitalia of Dichomeris spp. 14, D. arcuata sp. nov., holotype, genitalia slide No. 6711; 15, D. splendiptera sp. nov., paratype, genitalia slide No. 6712; 16, D. orientis Park & Hodges, genitalia slide No. 6695; 17, D. samkosensis sp. nov., holotype, genitalia slide No. 6710; 18, D. foliforma, sp. nov., paratype, genitalia slide No. ZSN 16117; 19, D. fuscusitis Li & Zheng, genitalia slide No. ZSN 15235. Scales = 0.5 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.