Promalactis introflexa 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 : 392-393

Promalactis introflexa Wang , sp. nov.

( Figs. 3 , 11, 12 )

Type material. Holotype ♂, Dong Hua Sao National Biodiversity Conservation Area (15.18°N, 106.13°E), Cham- pasak, Laos, 958 m, 29.VII.2019, coll. YS Bae, MJ Qi & DJ Lee et al., slide No. LC 19242.

Paratypes: 3♂ 3♀, 879‒958 m, 28‒30.VII.2019, other same data as holotype, slide Nos. LC19243♀, LC19244♂, LC19302♀, LC19246♀.

Diagnosis. This new species can be distinguished from its congeners by the juxta with very long slender lateral arms slightly curving inward. It is similar to P. disparatunca Wang, 2018 in the male genitalia, but can be distinguished by the symmetrical lateral arms of the uncus and the symmetrical sacculus; whereas in P. disparatunca , both lateral arms of the uncus and distal part of the sacculus are asymmetrical ( Jia & Wang 2018).

Description. Adult ( Fig. 3 ) Wingspan 10.0‒11.0 mm.

Head with vertex cream white, frons pale grey tinged with brown, occiput rust brown. Labial palpus with second segment orange yellow on inner surface, rust brown on outer surface except orange yellow at apex; third segment blackish brown. Antenna with scape white; flagellum black annulated with whitish yellow dorsally.

Thorax and tegula rust brown. Forewing orange yellow; dorsum with a blackish brown band from below fold widened to basal 1/4, then narrowed to tornus, with dense rust brown scales along basal 1/3 ventrally, edged with a distinct white line dorsally; median fascia rust brown, from anterior 1/5 narrowed to dorsum, with a silvery grey band along costal margin, its inner margin with a silvery grey spot along anterior 2/5 and an oblique white line along posterior 3/5, its outer margin with a wide silvery grey band; costal spot white, situated beyond silvery grey band; distal patch blackish brown, mixed with silvery grey; between costal spot and distal patch set an orange yellow patch; cilia deep grey, tinged with orange yellow around apex. Hindwing and cilia greyish brown.

Male genitalia ( Fig. 11 ). Uncus separated, linked by a slender band at base; lateral arm cornuted, wide at base, slightly narrowed to basal 2/3, distal 1/3 distinctly narrowed and curved outward. Gnathos plate short; lateral arm wide, longer than gnathos plate. Tegumen bifurcate from near posterior margin; lateral arm almost uniform. Valva narrow at base, widened to basal 1/3, again narrowed to distal 1/3 and curving inward; distal 1/3 scorpion tail-like, produced to a large distal spine curving inwardly, triangularly produced dorsally before distally spine, below this process set a small setose pad; costal part membranous, triangularly convex medially; sacculus extremely and uniformly wide, more than 2/3 width of valva, sclerotized on dorsal edge, fused with valva distally. Saccus wide at base, narrowed to about middle, then uniform to rounded apex. Juxta elongate digitate, slightly narrowed anteriorly; lateral arm slender, gently curved inwardly, forming a broad U shape, setose distally, pointed apically, far exceeding apex of uncus apically. Aedeagus slender, arched medially, longer than valva; cornutus absent.

Female genitalia ( Fig. 12 a-b). Apophyses posteriores 2.5 times as long as apophyses anteriores. Eighth tergite with anterior half sub-rectangular, posterior half broad U-shaped; lateral lobe sub-triangular, rounded apically. Lamella antevaginalis sub-trapezoidal as a whole, with a wide longitudinal median groove, concave at middle on posterior margin, triangularly produced to narrowly rounded apex posterolaterally. Ductus bursae slender, with a sclerite near corpus bursae. Corpus bursae round, with dense granules; signum W-shaped, pointed at tip, sclerotized on edge.

Distribution. Laos (Champasak).

Etymology. The epithet of the new species is derived from the Latin introflexus, referring to the scorpion-tailed distal 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.