Argyresthia (Argyresthia) orthocera, 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 : 38-39

25. Argyresthia (Argyresthia) orthocera , sp. nov. ( Figs. 35 , 104 , 160 , 216 )

Description. Adult ( Fig. 35 ) wingspan 11.5 mm. Head with vertex white, tinged with yellow, frons brownish yellow, face silvery white, brown laterally. Labial palpus white dorsally, brown ventrally. Antenna with scape white, mixed with yellow distally, pecten yellowish fuscous; flagellum black, dotted with yellowish white on each flagellomere dorsally. Foreleg with femur gray on inner surface, tibia and tarsus blackish fuscous on inner surface, tibia dotted with blackish fuscous near base, at middle, and on distal part dorsally, remainder yellow; midleg mostly yellow, tibia dotted with blackish fuscous near base and at middle dorsally, tarsus blackish gray on distal part of each tarsomere; hindleg mostly grayish white, with femur, tibia, and first tarsomere blackish gray on outer surface, other tarsomeres blackish gray on outer surface distally. Thorax yellowish white; tegula golden fuscous. Forewing ratio 4.3; ground color blackish fuscous, with purple metallic reflections; costa with a black spot at about middle, with a white spot near apex; termen with a few white dots; fuscous streak below basal 2/5 of fold, with golden reflection; black spot at middle of cell, black streak from distal end of cell at middle extending to white spot on costa near apex; dorsal band yellowish white, extending to basal 2/5 of wing, with distal 1/3 widened rectangularly and reaching fold; dorsal fascia black, from middle of wing to basal 3/5 of costa; black dot at tornus and at lower angle of cell; cilia white adjacent to white costal spots, blackish fuscous around apex, dark gray on termen and near tornus. Hindwing and cilia uniformly dark gray.

Male genitalia ( Figs. 104 , 160 , 216 ): Tuba analis equal to width of valva. Socius covered with 17̄20 scalelike setae, bearing two long setae posteriorly ( Fig. 216 ). Gnathos inflated distally, with nine long thick setae apically. Valva subrectangular, dorsal margin slightly concave before apex; with a row of long thick setae in disc near ventral margin, with several similar setae on distal area. Saccus longer than width of valva, its distal 2/3 narrowed, linear. Phallus slender, slightly curved at basal 1/3, 7.7 times as long as width of valva ( Fig. 160 ). Second sternite with about 13 micro-setae in each row; eighth sternite Y-shaped, with short stem. Coremata present.

Female unknown.

Type material. CHINA: Holotype, Ƌ, Shicao (33.27°N, 107.55°E), Yang County, Shaanxi Province, 450 m, 16.v.1995, leg. Hongjian Wang, slide no. LTT12774.

Distribution. China (Shaanxi).

Diagnosis. This new species can be easily distinguished from its congeners by the subrectangular valva in the male genitalia. It is most similar to A. (A.) papillata , sp. nov., in forewing pattern, but it can be separated by the blackish-fuscous ground color, and the absence of a white spot above the tornus. In A. (A.) papillata , sp. nov., the brownish to grayish fuscous forewing has a white spot above the tornus.

Etymology. The specific name is derived from the Latin orthocerus, meaning rectangular, referring to the shape of the valva.

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 102 – 107. Eighth sternite and male genitalia excluding phallus of Argyresthia spp. 102, A. (Argyresthia) curvativa, sp. nov., slide no. LTT 12853, holotype; 103, A. (A.) atomata, sp. nov., slide no. LTT 12804, holotype; 104, A. (A.) orthocera, sp. nov., slide no. LTT 12774, holotype; 105, A. (A.) cardiopetala, sp. nov., slide no. LTT 12432, paratype; 106, A. (A.) mala, sp. nov., slide no. LTT 12784, paratype; 107, A. (A.) longa, sp. nov., slide no. LTT 12493, holotype. (Scales = 0.2 mm)

FIGURES 158 – 161. Phallus of Argyresthia spp. 158, A. (Argyresthia) curvativa, sp. nov., slide no. LTT 12853, holotype; 159, A. (A.) atomata, sp. nov., slide no. LTT 12804, holotype; 160, A. (A.) orthocera, sp. nov., slide no. LTT 12774, holotype; 161, A. (A.) cardiopetala, sp. nov., slide no. LTT 12432, paratype. (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)