Nemophora triangulifascia Liao, Hirowatari & Huang, 2023

Liao, Cheng-Qing, Hirowatari, Toshiya, Yagi, Sadahisa, Wang, Min, Wang, Xing & Huang, Guo-Hua, 2023, The fauna of the family Adelidae (Insecta, Lepidoptera, Adeloidea) from China, Zootaxa 5348 (1), pp. 1-152 : 71

(89) Nemophora triangulifascia Liao, Hirowatari & Huang , sp. nov.

(Plates VIII-5, XIX-3)

LSID urn:lsid:zoobank.org:act:5518E922-1351-4AF4-B038-4B758408C021

Diagnosis. This species is similar to N. karafutonis moriokensis but can be distinguished by the special triangular yellow spot positioned in near the costal margin of the subapical area, while 4–6 unclear brownish short longitudinal striae in N. k. moriokensis . Additionally, this species has relatively large eyes in male (eye size index about 1.8) and distinctly protruded lateral margins of the valva basally.

Description. Male. Forewing about 8.1 mm; wing expanse about 17.0 mm.

Vertex covered with yellow hairs; face with smooth yellow scales and brown hairs. Eyes moderate in size, eye size index about 1.8. Labial palpus short, covered with black and yellow hairs; galeae with brown scales laterally. Antenna slender, 23.2 mm, about 2.9 × forewing length; black, apical part slightly light color. Legs dark brown to black but yellow in each tarsi and hind tibiae; hind tibiae with yellow long hairs. Thoracic dorsum and tegula brownish to dark brown, with purple metallic lusters. Forewing lanceolate, ground color yellow basally and black apically; basal part with two black-margined silver gray longitudinal striae placed at anterior and posterior margins of cell, which the second stria abruptly bending forward and almost reaching to apex of the first stria; four black narrow lines placed between these two striae and posterior area; middle part with two black-margined silver gray transverse central fasciae which separated by a broad yellow band; subapical area with a large triangular yellow spot connected apical half of the outer central fascia, and many shadowy yellow scales vaguely formed into 7 radial striae almost reaching outer margin; cilia black. Hindwing and cilia dark brown to black. Abdomen dark brown except apex black.

Female. Unknown.

Male genitalia. Uncus triangular, with weak median keel. Vinculum moderate in size, about 2.6 × as long as valva. Valva triangular, with blunt apex; inner margins slightly curved, lateral margins nearly straight, with broad base obviously beyond the width of vinculum; sacculus distinctly expanding at basal part, close to each other, fused basally; suspensorium nearly trapezoid, relatively pointed anterior part far beyond posterior margin of vinculum in ventral view. Transtilla wide laterally and narrow medially; median process long and pointed, with a pair of broad anterior angles laterally. Aedeagus slender; basal 1/4 and 3/4 slightly curved dorsally; apical portion with a pair of long sclerotized bar ventrally; vesica with two rows of spines dorsolaterally. Juxta arrow-shaped; arrow-head broad with blunt apex, lateral arms short.

Holotype. [Tibet] ♁, 2 km ahead of Sangzhenka Village, Gedang Country , Motuo County, Linzhi City , 2021. V.25–30, J. Wu & J.J. Fan leg. ( HUNAU).

Etymology. The specific epithet refers to the special triangular yellow spot near the costal margin of the forewing subapex.

Distribution. China (Tibet).

Remarks. This new species is endemic to Tibet, China and occurs in May.