Promalactis unidentalis Wang, 2020

Liu, Chen & Wang, Shuxia, 2020, Genus Promalactis Meyrick, 1908 (Lepidoptera: Oecophoridae) from Laos, with descriptions of five new species, Zootaxa 4755 (2), pp. 390-398 : 391

Promalactis unidentalis Wang , sp. nov.

( Figs. 1 , 9 )

Type material. Holotype ♂, Dong Hua Sao National Biodiversity Conservation Area (15.18°N, 106.13°E), Cham- pasak, Laos, 903 m, 30.VII.2019, coll. YS Bae, MJ Qi & DJ Lee et al., slide No. LC 19247.

Diagnosis. This new species is similar to P. superimposita Wang, Du & Li, 2013 and P. trigonilobata Wang, 2018 in the male genitalia. It can be distinguished from them by the dorsodistal part of the valva not extended ventrad but with a denticle ventroapically; in contrast, the dorsodistal part of the valva is produced ventrad to a large spine in P. superimposita , and enlarged ventrad triangularly and has two ventroapical denticles in P. trigonilobata ( Jia & Wang 2018) . In addition, the new species has a much slenderer and longer cornutus, which is relatively short and stout spine-like in the latter two species.

Description. Adult ( Fig. 1 ). Wingspan 10.0 mm.

Head with vertex snowy white, frons greyish yellow, occiput pale rust brown. Labial palpus with second segment dim ochreous yellow on outer surface, yellowish white on inner surface; third segment pale ochreous brown, mixed with white on inner surface, white at apex. Antenna with scape white; flagellum black annulated with white on dorsal surface.

Thorax and tegula pale rust brown. Forewing pale yellowish brown, with grey and blackish brown scales, darkened between basal and antemedian fasciae; markings white edged with black scales: costal spot placed beyond distal 1/3, large, ovate, extending to above lower angle of cell; basal fascia slender; antemedian fascia from basal 1/4 of costal margin to distal 2/5 of dorsum, parallel with basal fascia, uniformly wide; tornal spot brown, ill-defined; apex with dense blackish brown scales; cilia orange yellow, grey along distal part of costal margin and from middle of termen to tornus. Hindwing and cilia brown.

Male genitalia ( Fig. 9 ). Uncus elongate, wide at base, gradually narrowed to pointed apex, setose mediolaterally. Gnathos as long as uncus; gnathos plate narrow, scaly distally, rounded apically, with a large triangular membranous process from dorsal surface before apex, about 1/4 length of gnathos; lateral arm wide, band-shaped. Tegumen widened medially, bifurcate from posterior 1/4; lateral arm narrowed anteriorly. Valva narrow at base, widened to basal 3/5, then slightly narrowed and divided into two parts: costal part wider, not enlarged, setose distally, obtuse apically, with a ventroapical denticle, costa weakly convex at middle; saccular part slightly shorter than dorsal part, straight on dorsal margin, slightly narrowed to apex; sacculus slightly wide at base, smooth and narrowed to basal 3/5, thereafter densely setose and slightly widened to obtuse apex. Saccus slender, rod-like, approximately 1.5 times length of uncus, narrowly rounded at apex. Juxta small, rounded apically. Aedeagus straight, 1.5 times as long as valva; cornutus slender, straight, slightly shorter than half length of aedeagus.

Female unknown.

Distribution. Laos (Champasak).

Etymology. The epithet of the new species is derived from the Latin uni- and dentalis, referring to the ventroapical denticle on the costal part of the valva.

Figures

FIGURES 1‒8. Adults of Promalactis spp. 1, P. unidentalis, holotype ♂; 2, P. tenuiclavifera, holotype ♂; 3, P. introflexa, holotype ♂; 4, P. bolikhamsaiana, holotype ♂; 5, P. serrulata, holotype ♂; 6, P. carinata Du, Li et Wang, 2011; 7, P. flavidia Kim, 2018; 8, P. apicuncata Wang, 2018. Scales=2 mm.

FIGURES 9‒14. Genitalia of Promalactis spp. 9, P. unidentalis, holotype ♂, slide No. LC19247; 10, P. tenuiclavifera, holotype ♂, slide No. LC19241; 11, P. introflexa, holotype ♂, slide No. LC19242; 12a, P. introflexa, paratype ♀, slide No. LC19302, 12b, enlarged signum, slide No. LC19246; 13, P. bolikhamsaiana, holotype ♂, slide No. LC19262; 14, P. serrulata, holotype ♂, slide No. LC19250. Scales=0.2 mm.