Meleonoma rectivalva Zhu & Wang 2022, sp. nov.

Meleonoma rectivalva sp. nov.

(Figs 5, 17, 29)

urn:lsid:zoobank.org:act: 952B7096-3FAF-475A-92A9-436C5FC2412D

Type material. CHINA, Sichuan: Holotype ♂, Shaoyaogou (30.78°N, 103.20°E), Anzi River, Chengdu, 1598 m, 23. VI.2016, leg. KJ Teng & XF Yang, slide No. ZXJ19511. Paratypes: 4♂ 2♀, same data as holotype, slide Nos. ZXJ19500 ♂, ZXJ19531 ♀; 5♂ 8♀, 20–22. VI.2016, other same data as holotype, slide Nos. ZXJ19711 ♂, ZXJ19712 ♂, ZXJ19718 ♀, XZX20223 ♀; 2♀, Baliping, Anzi River, Chengdu, 1706 m, 24. VI.2016, leg. KJ Teng & XF Yang, slide No. ZXJ19719; 2♂ 3♀, Mt. Sigu'niang, Xiaojin County, 3243 m, 3–6.VII.2016, leg. KJ Teng & XF Yang, slide Nos. ZXJ19713 ♂, ZXJ19714 ♀, ZXJ19717 ♀, XZX20224 ♂.

Diagnosis. The new species can be distinguished from its congeners in the male genitalia by the rectangular valva with a sclerotized ventral band that bears two apical spines, the setose digitate transtilla extending ventrad, and the triangular sacculus with an acute apex; in the female genitalia by the sub-trapezoidal lamella antevaginalis with two small ridges laterally near anterior margin.

Description. Adult (Fig. 5). Forewing length 6.0–7.0 mm.

Head with frons yellow; vertex and occiput dark brown, yellowish brown laterally. Labial palpus yellow; second palpomere with sparse dark brown scales on both dorsal and ventral surfaces as well on outer surface, with a dark brown ring near apex; third palpomere with a dark brown line extending from base to distal 1/3 on ventral surface. Antenna with scape yellow except dark brown on dorsal surface; flagellum dark brown, alternated with yellow on ventral surface.

Thorax and tegula dark brown. Forewing dark brown, with two yellow costal spots; inner costal spot very small, at basal 2/5, outer costal spot larger, at about distal 1/3; discocellular and plical spots black, not clearly distinguished from ground color; discal spot black, placed at about middle of cell, edged with yellow scales on outer side; fringe dark brown. Hindwing and fringe dark brown. Legs yellow; on ventral surface, femora of fore- and midlegs with dark brown scales, tibia of foreleg dark brown except basal half mixed with yellow scales and apex yellow, tibiae of mid- and hindlegs dark brown except yellow at middle and at apex, tarsus of foreleg dark brown except yellow at base of basal tarsomere and at apices of basal two and apical one tarsomeres, basal three tarsomeres of midleg dark brown except yellow at apices and at base of basal tarsomere, basal four tarsomeres of hindleg dark brown except apices yellow.

Male genitalia (Fig. 17). Uncus slender, slightly narrowed to pointed apex. Gnathos weakly sclerotized basolaterally, just exceeding posterior margin of tegumen, membranous anteriorly. Tegumen V-shaped, with large triangular anterior emargination; lateral arm narrowed anteriorly. Valva straight, rectangular, slightly produced dorsoapically; ventral margin heavily sclerotized, forming a sclerotized band widened distally and bearing two apical spines; costa almost straight, narrowed toward tip of costal margin, with sparse setae; transtilla digitate, extended ventrad, with long setae. Sacculus triangular, narrowed to pointed apex; ventral margin sclerotized, straight, folded in basal 2/3. Saccus broad sub-triangular, gradually narrowed from wide base to rounded apex. Juxta U-shaped; lateral lobe stout, rounded at apex. Aedeagus twice as long as valva, basal half tubular, distal half thickened, with a tooth near apex, a curved digitate process at apex, and a tooth in vesica.

Female genitalia (Fig. 29). Papilla analis sub-rectangular, setose. Apophyses posteriores about twice as long as apophyses anteriores. Eighth sternal plate notched at middle on posterior margin, forming two semicircular lobes, lined with sparse long setae. Lamella antevaginalis large, sub-trapezoidal, dentate and with a small notch at middle on posterior margin; anterior margin slightly convex, with two small ridges laterally near anterior margin. Antrum triangularly produced mediolaterally, narrowed anteriorly. Ductus bursae with posterior half sclerotized, anterior half membranous. Corpus bursae rounded, shorter than ductus bursae; signum large, ovoid, with dense teeth and a large apical spine.

Distribution. China (Sichuan).

Etymology. The specific epithet is derived from the Latin recta and the term valva, referring to the shape of the valva.