Parastenolechia trapezia Li

Liu, Linjie & Li, Houhun, 2016, Taxonomic review of the genus Parastenolechia Kanazawa (Lepidoptera, Gelechiidae, Litini) from Mainland China, with descriptions of six new species, Zootaxa 4178 (1) : -

Parastenolechia trapezia Li , sp. nov.

( Figs. 12 , 23 , 5 , 39 )

Type material. CHINA: Holotype Ƌ, Hubei Province: Mt. Wujia (31.09°N, 115.80°E), Yingshan County, 880 m, 30.vi.2014, leg. Wei Guan and Meiqing Yang, genitalia slide No. LLJ15013 . Paratypes: Hubei Province: 1Ƌ, Lichuan , 700 m, 30.vii.1999, leg. Houhun Li, genitalia slide No. LLJ15035 ; 1Ƌ, Taohuachong, Yingshan County, 635 m, 27.vii.2014; 4Ƌ, Mt. Jiugong , Xianning, 27.vii.2011, leg. Yunli Xiao, genitalia slide No. LLJ15009 ; Zhejiang Province: 1♀, Yulingguan, Qingliangfeng , 220 m, 23.vii.2014, leg. Aihui Yin, Xuemei Hu and Qingyun Wang, genitalia slide No. LLJ15049 ; 1Ƌ, Yinzhou, Ningbo , 450 m, 26.vii.2015, leg. Aihui Yin, Kang Lou and Tao Wang ; Fujian Province: 1♀, Sangang, Mt. Wuyi , 740 m, 27.vii.2008, leg. Weichun Li, Yongling Sun and Haiyan Bai ; Guizhou Province: 1♀, Wongang , Libo County, 1345 m, 19.vii.2015, leg. Jiping Wang.

Adult ( Fig. 12 ). Wingspan 10.5–12.5 mm. Head white. Labial palpus white; second segment with basal half blackish brown on outer surface, longer than third, scales fluffy apically; third segment blackish brown at basal 1/4 and before apex, pale yellowish brown in some individuals. Antenna with scape white, tinged with blackish brown scales on dorsal surface; flagellum alternately white and black. Thorax and tegula white, tegula sometimes pale yellow at base. Forewing snowy white, suffused with pale yellowish brown scales in distal half; markings black: sub-basal patch obliquely extending from costa across fold, joined with plical spot, then sparsely diffused to dorsum, with raised scales at fold; costa with a relatively small inverted subtriangular spot at basal 2/5 reaching above upper margin of cell, with a large inverted trapeziform patch at basal 2/3 diffused to above discal and discocellular spots, with a few ill-defined tiny dots distally; discal and discocellular spots small, below costal patch; tornal spot subtriangular, reaching lower angle of cell; cilia grayish brown except grayish white tinged with brown along termen. Hindwing and cilia dark grayish brown. Legs black, mid tibia white in distal half; hind tibia with long yellowish white scales, tarsus with apex of each tarsomere white.

Male genitalia ( Fig. 23 ). Eighth sternum nearly trapeziform. Uncus quadrate, posterior margin slightly concave mesially, posterolateral angle rounded. Gnathos semielliptical, anteromedian process triangular, roundly protruding laterally. Tegumen furcate from middle, roundly projected posteriorly, lateral branch narrowed anteriorly. Glandiductor asymmetrical: right glandiductor (dorsal view) relatively thick, shorter than slender left glandiductor, both exceeding top of uncus apically, extremely dilated subtriangularly at base, strongly curved at approximately basal 1/4. Valva broad, subrectangular; outer lobe slender, setose apically; inner lobe thicker, subtriangular, slightly longer than 1/3 length of outer lobe. Juxta slightly longer than outer lobe of valva; basal 2/3 broad, rectangular; distal 1/3 narrow, arched outward on outer margin, sharply narrowed and hooked from before apex. Vinculum somewhat inverted triangular; saccus narrow, longer than vinculum, slightly curved. Aedeagus shorter than tegumen, slender, slightly broad basally, curved mesially, distal 1/2 truncate.

Female genitalia ( Figs. 5 , 39 ). Eighth sternum with posterior margin concave mesially, with sparse setae. Apophyses anteriores slightly curved near base, much stronger than apophyses posteriores, shorter than half length of apophyses posteriores. Ostium bursae small and rounded, laterally with fine pleats; lateral lobes large, elongate ovate. Antrum weakly sclerotized, narrower than ductus bursae, shorter than lateral lobe of ostium bursae. Ductus bursae more than four times length of corpus bursae. Corpus bursae ovate; signum semicircular, posterior margin round, anterior margin concave mesially, protruding anterolaterally, spines prelateral.

Diagnosis. This species is similar to P. asymmetrica in the male genitalia by the asymmetrical glandiductor, the subquadrate uncus and the basally rectangular juxta. It can be easily differentiated by the forewing with an inverted triangular black spot at costal 2/5; the ductus bursae without ring-like sclerite, and the signum concave mesially on the anterior margin in the female genitalia. In P. asymmetrica , the forewing has no spot at costal 2/5; the ductus bursae bears a ring-like sclerite anterior to ostium, and the signum is straight on the anterior margin in the female genitalia ( Kanazawa 1985). Parastenolechia trapezia sp. nov. resembles P. albicapitella in the forewing pattern and the genitalia. It can be easily differentiated in the male genitalia by the relatively thick right glandiductor shorter than the slender left glandiductor, and the thicker subtriangular inner lobes of the valva are slightly less than 1/3 the length of the outer lobes; and in the female genitalia by the semicircular signum with spines arising prelaterally. In P. albicapitella the glandiductor is symmetrical, and the slender inner lobes of the valva are slightly shorter than half the length of the outer lobes in the male genitalia, and the subtriangular signum arises anterolaterally in the female genitalia.

Distribution. China (Fujian, Guizhou, Hubei, Zhejiang).

Etymology. The specific epithet is derived from the Latin trapezius (trapeziform), referring to the large inverted trapeziform patch at costal 2/3 of the forewing.

Figures

FIGURES 12 – 15. Adults of Parastenolechia spp. 12, P. t r ap e z ia sp. nov., holotype, male; 13, P. semielliptica sp. nov., holotype, male; 14, P. medispina sp. nov., holotype, male; 15, P. longifolia sp. nov., holotype, male (Scale bars = 2.0 mm).

FIGURES 21 – 25. Male genitalia of Parastenolechia spp. 21, P. papillaris sp. nov., paratype, slide No. LLJ 15091; 22, P. claustrifera Meyrick, slide No. LLJ 15036; 23, P. trapezia sp. nov., paratype, slide No. LLJ 15009; 24, P. semielliptica sp. nov., holotype, slide No. LLJ 15054; 25, P. longifolia sp. nov., holotype, slide No. LLJ 15043 (Scale bars = 0.3 mm).

FIGURES 3 – 5. Morphology of Parastenolechia spp. 3. Male genitalia of P. medispina sp. nov., holotype, slide No. LLJ 15043; 4. Eighth sternum of P. semielliptica sp. nov., holotype, slide No. LLJ 15054; 5. Female genitalia of P. trapezia sp. nov., paratype, slide No. LLJ 15049 (Scale bars = 0.3 mm).

FIGURES 33 – 40. Enlarged lateral lobes of female ostium bursae of Parastenolechia spp. 33, P. albicapitella, slide No. LLJ 14113; 34, P. argobathra, slide No. LLJ 15047; 35, P. collucata, slide No. LLJ 15048; 36, P. arciformis sp. nov., paratype, slide No. LLJ 15089; 37, P. papillaris sp. nov., paratype, slide No. LLJ 15064; 38, P. claustrifera Meyrick, slide No. LLJ 15050; 39, P. trapezia sp. nov., paratype, slide No. LLJ 15049; 40, P. medispina sp. nov., paratype, slide No. LLJ 15111 (Scale bars = 0.1 mm).