Argyresthia (Argyresthia) biloba Liu, Wang & Li, 2017, sp. nov.
Creators: name: Liu, Tengteng
name: Wang, Shuxia
name: Li, Houhun
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Yponomeutidae
Argyresthia
Argyresthia biloba

description: 15. Argyresthia (Argyresthia) biloba, sp. nov. (Figs. 24, 260)
Description. Adult (Fig. 24) wingspan 14.0 mm. Head white. Labial palpus yellowish white. Antenna with scape white, pecten blackish fuscous; flagellum white, ringed with blackish fuscous. Foreleg blackish fuscous on inner surface, yellowish white mixed with blackish fuscous on outer surface; midleg pale fuscous, mixed with black; hindleg white except tibia gray distally, tarsus gray at apex of each tarsomere laterally. Thorax white, mixed with black; tegula black. Forewing ratio 5.0; pale grayish fuscous, suffused with black scales in distal 1/3; costa with about ten black dots, alternating with yellowish white, black dot at middle largest, white dot before apex larger; black dots along termen and distal 2/5 of dorsum; broad black streak beneath basal 2/5 of fold; dorsal band yellowish white, extending from base to end of fold; dorsal fascia black, from before middle of wing obliquely outward to fold, then diffused to before 7/10 of costa, weakening anteriorly; ill-defined black spot at middle of cell, more or less connected with black markings beneath fold and on dorsum, with black dot at its lower angle; cilia black on costa and around apex, white at large apical white dot, dark gray on termen. Hindwing and cilia uniformly gray. Abdomen silvery gray dorsally; ventral surface yellowish white, with a longitudinal blackish-gray tinge medially.
Female genitalia (Fig. 260): Ovipositor 3.3 times as long as eighth segment. Anterior apophysis 3/5 length of posterior apophysis, bifurcate at middle, dorsal branch fused with ostium bursae, forming ventral margin of ostium bursae. Lamella postvaginalis narrow hourglass-shaped, concave anteriorly. Antrum elongate funnel-shaped, 1.2 times length of eighth segment. Ductus bursae sparsely spinulated from before opening of ductus seminalis to near corpus bursae; ductus seminalis originating from anterior 4/9 of ductus bursae. Corpus bursae oval, with dense denticles, lateral margin concave at anterior 2/5, anterior margin medially concave to anterior 1/5, forming two rounded lobes; signum with basal plate band-shaped, uniform in width, horns extending outward almost horizontally, anterior margin slightly concave at middle.
Male unknown.
Type material. CHINA: Holotype, ♀, Yadong County (27.49°N, 88.91°E), Xizang Autonomous Region, 2950 m, 29.viii.2006, leg. Xinpu Wang and Huaijun Xue, slide no. LTT12342. Paratype: 1♀, same data as holotype, except 28.viii.2003, slide no. LTT12341.
Distribution. China (Xizang).
Diagnosis. The bilobed corpus bursae in the female genitalia of the new species distinguishes it from most species of the genus. Argyresthia (A.) biloba, sp. nov., is superficially similar to A. (A.) conjugella, but the former can be distinguished by the distinct female genitalia. In A. (A.) biloba, sp. nov., the ovipositor is 3.3 times the length of the eighth segment, the lamella postvaginalis is narrowly hourglass-shaped, and the antrum is 1.2 times the length of the eighth segment. In A. (A.) conjugella, the ovipositor is 2.8 times the length of the eighth segment, the lamella postvaginalis is trapezoidal, and the antrum is half the length of the eighth segment. Argyresthia (A.) biloba, sp. nov., is superficially similar to A. (A.) assimilis which was described from a single male specimen, but it can be distinguished by the absence of a square spot on the dorsum before the middle of the wing, which is present in A. (A.) assimilis.
Etymology. The specific name is derived from the Latin bilobus, meaning bilobed, referring to the anteriorly bilobed corpus bursae.
description: Published as part of 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, pp. 1-135 in Zootaxa 4292 (1) on pages 29-30, DOI: 10.5281/zenodo.827746