Meleonoma basitriangula, Zhu & Wang, 2022

Zhu, Xiaoju & Wang, Shuxia, 2022, Taxonomy of the genus Meleonoma Meyrick, 1914 (Lepidoptera: Autostichidae) from China (IV), with descriptions of twelve new species, Zootaxa 5087 (4), pp. 501-521 : 509-510

Meleonoma basitriangula sp. nov.

( Figs 8 , 20 , 31 )

urn:lsid:zoobank.org:act:2490E754-A9B2-414F-A379-72211E6B5354

Type material. CHINA, Yunnan: Holotype ♂, Xiaodifang Village (24.87°N, 98.75°E), 2116 m, 12.VIII.2014, leg. KJ Teng et al., slide No. ZXJ19358 . Paratypes: 1♀, same data as holotype, slide No. ZXJ19584 ; 2♂ 1♀, Linjiapu, Tengchong , 2144 m, 14‒16.VIII.2014, leg. KJ Teng et al., slide Nos. ZXJ19590 ♂, ZXJ19598 ♀.

Diagnosis. The new species can be distinguished from other species of the group in the male genitalia by the valva triangularly convex at basal 2/5 on the ventral margin, the sub-triangular setose process at base of the valva, and the aedeagus with fine wrinkles distally; in the female genitalia by the large bowl-shaped antrum triangularly produced posterolaterally.

Description. Adult ( Fig. 8 ). Forewing length 7.0 mm.

Head yellow, tipped with black on vertex. Labial palpus yellow; second palpomere black on outer surface, with a black ring at apex; third palpomere with scattered black scales. Antenna yellow on ventral surface; scape black, flagellum black annulated with yellow on dorsal surface.

Thorax black mixed with yellow; tegula black, yellow apically. Forewing ground color yellow, covered with dense black scales; costal margin with dense black scales along basal 1/3, with black dot before middle, before distal 1/3 and near distal 1/5 respectively, with dense black scales between inner two dots diffused and crossing anterior margin of cell, outmost dot small, ill-defined; large black patch extending from distal part of costal margin along termen to tornus formed by denser black scales; plical, discal and discocellular dots black, discocellular dots doubled, placed at anterior and posterior angles of cell respectively; fringe yellow, black at distal part of costal margin and around tornus. Hindwing and fringe greyish brown. Legs yellow; on ventral surface, coxa of foreleg with sparse black scales, femur black, tibia black except yellow apically, tarsus black except yellow at base of basal tarsomere and at apices of basal two and apical one tarsomeres, tibia of midleg black except yellow at middle and at apex respectively, tarsus black except yellow at base of basal tarsomere and at apices of basal three tarsomeres and yellow at apical one tarsomere, tibia of hindleg with sparse black scales, tarsus with basal three tarsomeres black except yellow at base of basal tarsomere and at apices, femora of mid- and hindlegs with sparse black scales.

Male genitalia ( Fig. 20 ). Uncus slender, hooked and pointed apically. Tegumen widened medially; lateral arm narrowed anteriorly. Valva narrow at base, widened to basal 2/5, thereafter narrowed to rounded apex, setose ventrodistally, convex triangularly at basal 2/5 on ventral margin, with a setose sub-triangular plate at base; costa narrowed from base to before tip of costal margin; transtilla clavate, narrowed toward middle, rounded at apex. Sacculus wide at base, slightly narrowed to apex; apex obtuse, weakly sclerotized, dentate. Saccus indistinctly extended, rounded anteriorly. Juxta U-shaped. Aedeagus slightly longer than valva; basal 2/5 tubular, distal 3/5 slightly tapered from preapex to rounded apex, with fine wrinkles.

Female genitalia ( Fig. 31 ). Papilla analis sub-quadrate, setose. Apophyses posteriores 2.5 times as long as apophyses anteriores. Eighth tergite obtuse on posterior margin, concave on anterior margin. Eighth sternal plate spiculate, slightly concave medially and lined with long setae on posterior margin. Lamella postvaginalis deeply concave medially on posterior margin, forming two hill-shaped posterior processes, straight on anterior margin; lamella antevaginalis obtuse on posterior margin, concave medially on anterior margin, narrowly extending outward from middle to join with lamella postvaginalis laterally. Antrum bowl-shaped, triangularly produced posterolaterally. Ductus bursae membranous, with fines wrinkles. Corpus bursae gourd-shaped, shrunk laterally at posterior 1/3, spiculate medially; ductus seminalis arising from below entrance of corpus bursae, dilated basally; accessory bursae arising from anterior 2/5; signum absent.

Distribution. China (Yunnan).

Etymology. The specific epithet is derived from the Latin basis and triangulus, referring to the sub-triangular plate at base of the valva.

Figures

FIGURES 4−9. Adults of Meleonoma spp. 4, M. aculeolata sp. nov.; 5, M. rectivalva sp. nov.; 6, M. robustijuxta sp. nov.; 7, M. varilobata sp. nov.; 8, M. basitriangula sp. nov.; 9, M. biprocessa sp. nov. All holotypes and males. Scale bars = 2.0 mm.

FIGURES 16−21. Male genitalia of Meleonoma spp. 16, M. aculeolata sp. nov., holotype, slide No. ZXJ19527; 17, M. rectivalva sp. nov., holotype, slide No. ZXJ19511; 18, M. robustijuxta sp. nov., holotype, slide No. ZXJ19449; 19, M. varilobata sp. nov., holotype, slide No. ZXJ19451; 20, M. basitriangula sp. nov., paratype, ZXJ19590; 21, M. biprocessa sp. nov., holotype, slide No. ZXJ19369. Scale bars = 0.5 mm.

FIGURES 28−31. Female genitalia of Meleonoma spp. 28, M. aculeolata sp. nov., paratype, slide No. ZXJ19536; 29, M. rectivalva sp. nov., paratype, ZXJ19531; 30, M. varilobata sp. nov., paratype, ZXJ19464; 31, M. basitriangula sp. nov., paratype, slide No. ZXJ19584. Scale bars = 0.5 mm.