Argyresthia (Argyresthia) acuminata, Liu, Tengteng, Wang, Shuxia & Li, Houhun, 2017

Liu, Tengteng, Wang, Shuxia & Li, Houhun, 2017, Review of the genus Argyresthia Hübner, [1825] (Lepidoptera: Yponomeutoidea: Argyresthiidae) from China, with descriptions of forty-three new species, Zootaxa 4292 (1), pp. 1-135 : 36-37

22. Argyresthia (Argyresthia) acuminata , sp. nov. ( Figs. 32 , 101 , 157 , 213 , 264 )

Description. Adult ( Fig. 32 ) wingspan 12.0 mm. Head white, face tinged with pale yellow. Labial palpus pale yellow, mixed with gray laterally. Antenna with scape white, pecten yellow; flagellum grayish white, ringed with black. Foreleg with femur gray on inner surface, tibia and tarsus blackish fuscous on inner surface, remainder white; midleg mostly pale yellowish white, tibia dotted with blackish gray near base, at middle, and on distal part dorsally, tarsus blackish gray on distal part of each tarsomere; hindleg grayish white on inner surface, gray on outer surface, tarsus blackish gray distally on outer surface of each tarsomere. Thorax white; tegula silvery dark gray. Forewing ratio 4.5; ground color gray; costa interspersed with black and white dots in basal 4/5, black dot before middle largest, with white spot at distal 1/10 and before apex, the latter smaller or absent; black mixed with gray streak below basal 2/5 of fold; black spot at middle of cell; dorsal band white, extending to before tornus, with scattered gray scales distally; dorsal fascia black, from before middle of wing to distal 3/10 of costa, narrowed; black streak along vein R4, below it with suffused white scales extending to termen; black dots at tornus and at lower angle of cell; cilia white adjacent to white costal spots, black around apex, grayish white near tornus. Hindwing and cilia uniformly gray.

Male genitalia ( Figs. 101 , 157 , 213 ): Tuba analis shorter than width of valva. Socius covered with 17̄19 scale-like setae narrowed to pointed apex, bearing two long setae posteriorly ( Fig. 213 ). Gnathos inflated distally, with six to eight long thick apical setae. Valva more or less heart-shaped, narrowly rounded apically; a row of long thick setae in disc near ventral margin with several similar setae in distal area. Saccus shorter than width of valva, with distal 3/4 nearly linear. Phallus straight, truncate or narrowly rounded apically, 5.6 times as long as width of valva ( Fig. 157 ). Second sternite with about 18 micro-setae in each row; eighth sternite Y or V-shaped. Coremata present.

Female genitalia ( Fig. 264 ): Ovipositor 2.5 times as long as eighth segment. Anterior apophysis 3/4 length of posterior apophysis, bifurcate before middle, branches fused, forming weakly and thinly sclerotized ventral margin of ostium bursae. Lamella postvaginalis triangular. Antrum funnel-shaped, half length of eighth segment. Ductus bursae densely spinulate before and near opening of ductus seminalis; ductus seminalis originating from anterior 2/ 5 of ductus bursae. Corpus bursae small, round, concave slightly on anterior margin, with sparse micro-spines and denticles; signum with basal plate band-shaped, horns short, extending outward almost horizontally, anterior margin rounded.

Type material. CHINA: Holotype, Ƌ, Dadian Forest Station (36.55°N, 111.21°E), Mt. Wulu, Linfen City , Shanxi Province, 1620 m, 19.vii.2013, leg. Tengteng Liu and Peixin Cong, slide no. LTT12740 . Paratypes: Shanxi Province: 6♀, same data as holotype, except 19, 20.vii.2013, slide nos. LTT12735 , LTT12749̄50; 4♀, Mt. Mian (36.87°N, 111.99°E), Jiexiu County, 1370 m, 25̄ 27.vii.2013, leg. Tengteng Liu and Peixin Cong, slide nos . LTT12313, LTT12453̄4, LTT12752; 4♀, Mt. Lingkong (36.61°N, 112.08°E), Qinyuan County, 1560 m, 31.vii, 1– 2.viii.2013, leg. Tengteng Liu and Peixin Cong, slide nos . LTT12737, LTT12857; 1♀, Mt. Tianlong (37.73°N, 112.37°E), Taiyuan City , 1280 m, 12.vii.2013, leg. Tengteng Liu and Peixin Cong, slide no . LTT12741; 1♀, Xixia (35.45°N, 112.03°E), Xiachuan Village , Qinshui County, Jincheng City , 1500 m, 16.viii.2012, leg. Qiang Gao and Na Chen, slide no . LTT12761; 1♂, Xiyao Village (38.67°N, 112.01°E), Ningwu County, 1475 m, 21.vii.2011, leg. Shulian Hao and Jiayu Liu, slide nos . LTT12839, LTT12839W; Gansu Province: 1Ƌ, Mt. Xinglong (35.80°N, 104.07°E), Yuzhong County, 8.vii.1992, leg. Houhun Li, slide no . L93011 . Inner Mongolia Autonomous Region: 2♀, Mt. Dongmotianling (40.43°N, 112.10°E), Heilaoyao, Huhehaote City , 1480 m, 12.viii.2007, leg. Houhun Li and A. Bidzilya, slide nos . LTT12468, LTT12848.

Other material: Shanxi Province: 1♀ (without abdomen), Mt. Lingkong (36.61°N, 112.08°E), Qinyuan County, 1560 m, 1.viii.2013, leg. Tengteng Liu and Peixin Cong.

Distribution. China (Gansu, Inner Mongolia, Shanxi).

Diagnosis. This new species is closest to A. (A.) curvativa , sp. nov., superficially. It can be separated from the latter by the forewing lacking white scales in the basal 1/10 to 2/5 near the costa and with the dorsal fascia reaching the costa; in the male genitalia by the straight phallus being 5.6 times as long as the width of the valva; and in the female genitalia by the signum rounded on the anterior margin. In A. (A.) curvativa , sp. nov., the forewing is suffused with white scales from the basal 1/10 to 2/5 near the costa and the dorsal fascia does not reach the costa; the phallus is curved at distal 1/3 and is 3.5 times as long as the width of the valva; and the signum is straight on the anterior margin. Argyresthia (A.) acuminata is similar to A. (A.) conjugella in the shape of the signum, but A. (A.) acuminata has a white frons, a triangular lamella postvaginalis, and a corpus bursae slightly concave on the anterior margin; in contrast, A. (A.) conjugella has a yellowish-fuscous frons, a trapezoidal lamella postvaginalis, and a corpus bursae with the anterior margin deeply concave to about anterior 1/3.

Etymology. The specific name is derived from the Latin acuminatus, meaning narrowed and pointed, referring to the scale-like setae on the socius narrowed and pointed apically.

Figures

FIGURES 28 – 35. Adults of Argyresthia spp. 28, A. (Argyresthia) trigonophylla, sp. nov., ♂, holotype; 29, A. (A.) chiotorna, sp. nov., ♂, paratype; 30, A. (A.) hirsuta, sp. nov., ♂, holotype; 31, A. (A.) papillata, sp. nov., ♂, paratype; 32, A. (A.) acuminata, sp. nov., ♂, holotype; 33, A. (A.) curvativa, sp. nov., ♂, holotype; 34, A. (A.) atomata, sp. nov., ♂, holotype; 35, A. (A.) orthocera, sp. nov., ♂, holotype. (Scales = 2.0 mm)

FIGURES 96 – 101. Eighth sternite and male genitalia excluding phallus of Argyresthia spp. 96, A. (Argyresthia) flavifusca, sp. nov., slide no. LTT 12880, holotype; 97, A. (A.) trigonophylla, sp. nov., slide no. LTT 12816, paratype; 98, A. (A.) chiotorna, sp. nov., slide no. LTT 12471, holotype; 99, A. (A.) hirsuta, sp. nov., slide no. LTT 12841, holotype; 100, A. (A.) papillata, sp. nov., slide no. LTT 12815, holotype; 101, A. (A.) acuminata, sp. nov., slide no. LTT 12740, holotype. (Scales = 0.2 mm)

FIGURES 154 – 157. Phallus of Argyresthia spp. 154, A. (Argyresthia) chiotorna, sp. nov., slide no. LTT 12471, holotype; 155, A. (A.) hirsuta, sp. nov., slide no. LTT 12841, holotype; 156, A. (A.) papillata, sp. nov., slide no. LTT 12815, holotype; 157, A. (A.) acuminata, sp. nov., slide no. LTT 12740, holotype. (Scales = 0.2 mm)

FIGURES 209 – 220. Socii of Argyresthia spp. 209, A. (Argyresthia) trigonophylla, sp. nov., slide no. LTT 12816, paratype; 210, A. (A.) chiotorna, sp. nov., slide no. LTT 12757, paratype; 211, A. (A.) hirsuta, sp. nov., slide no. LTT 12841, holotype; 212, A. (A.) papillata, sp. nov., slide no. LTT 12815, holotype; 213, A. (A.) acuminata, sp. nov., slide no. LTT 12740, holotype; 214, A. (A.) curvativa, sp. nov., slide no. LTT 12853, holotype; 215, A. (A.) atomata, sp. nov., slide no. LTT 12804, holotype; 216, A. (A.) orthocera, sp. nov., slide no. LTT 12774, holotype; 217, A. (A.) cardiopetala, sp. nov., slide no. LTT 12432, paratype; 218, A. (A.) mala, sp. nov., slide no. LTT 12784, paratype; 219, A. (A.) longa, sp. nov., slide no. LTT 12493, holotype; 220, A. (A.) decurtata, sp. nov., slide no. LTT 12842, holotype. (Scales = 0.1 mm)

FIGURES 262 – 264. Female genitalia of Argyresthia spp. 262, A. (Argyresthia) trigonophylla, sp. nov., slide no. LTT 12850, paratype; 263, A. (A.) chiotorna, sp. nov., slide no. LTT 12846, paratype; 264, A. (A.) acuminata, sp. nov., slide no. LTT 12750, paratype. (Scales = 0.5 mm)