Promalactis plicata Wang, 2020

Wang, Shuxia & Liu, Chen, 2020, Taxonomic study of the genus Promalactis Meyrick, 1908 (Lepidoptera: Oecophoridae) IX. The maculosa species-group, with descriptions of eighteen new species, Zootaxa 4890 (1), pp. 38-66 : 45

Promalactis plicata Wang , sp. nov.

( Figs 7 , 25 )

Type material. CHINA, Zhejiang: Holotype ♂, Linkeng Village (28.53°N, 120.70°E), Yongjia, 387 m, 24.VIII.2016, leg. QY Wang et al., slide No. JYY17788.

Diagnosis. This species can be distinguished from its congeners in the male genitalia by the mesial plate having dense sinuate pleats, an elongate triangular valva, and a short aedeagus without cornutus.

Description. Adult ( Fig. 7 ). Wingspan 7.5 mm. Head with vertex dark brown, with snowy white scales laterally, frons greyish black. Labial palpus with second segment black on outer surface, brownish grey mixed with black scales on inner surface; third segment black except white at base and apex. Antenna with scape snowy white except dorsally black at apex; flagellum black, alternated with white on dorsal surface. Thorax and tegula deep ochreous yellow. Forewing ochreous yellow; markings white margined with black scales: costal spot at about 3/5, extending obliquely outward to above posterior angle of cell, with a short black stripe from inner margin narrowed inward, with a longer black stripe from outside extending obliquely outward to apical spot; cell with a stripe extending obliquely outward from subbase to beyond basal 1/4, arched; fold with a small spot at base, a larger spot at basal 2/5 and above basal 3/5 respectively; dorsum with three evenly spaced streaks in basal 3/4; apical spot ovate; terminal spot closer to tornal spot, with dense black scales on its inner margin; tornal spot rounded, surrounding black scales diffused to spot at basal 2/5 of fold and to terminal spot respectively; cilia ochreous yellow. Hindwing and cilia deep grey. Legs black; midleg grey ventrally, tibiae of fore- and midlegs with white spot at base and middle, with a tuft of white scales at apex, tarsi white at apices of basal two tarsomeres; hindleg brown ventrally, tarsus white at apices of basal two and fourth tarsomeres, and on entire apical tarsomere.

Male genitalia ( Fig. 25 ). Uncus wide at base, narrowed to pointed apex. Gnathos as long as uncus; mesial plate short, spatulate, with short strong sinuate pleats, rounded at apex; basal arm three times length of mesial plate, expanded basally. Tegumen widened to posterior 2/3; lateral arm narrowed triangularly. Valva elongate triangular, slightly narrowed to apex; costa narrowly banded, becoming weak distally; sacculus wide, narrowed and produced to a spine directed dorsad distally, setose. Vinculum rounded on anterior margin, not distinctly produced to a saccus. Juxta with lateral arm gradually narrowed; basal lobe strong. Aedeagus simple, less than half length of valva; cornutus absent.

Female unknown.

Distribution. China (Zhejiang).

Etymology. The specific epithet of the new species is derived from the Latin plicatus, referring to the short pleats of the gnathos.

Figures

FIGURES 7‒12.Adults of Promalactis spp. 7, P. plicata, holotype, ♂; 8, P. bomiensis, paratype, ♂; 9, P. fasciserrata, holotype, ♀; 10, P. brevipalpa, holotype, ♂; 11, P. libona, holotype, ♂; 12, P. medilargissima, holotype, ♂. Scales = 2 mm.

FIGURES 25‒30. Male genitalia of Promalactis spp. 25, P. plicata, holotype, slide No. JYY17788; 26, P. bomiensis, holotype, slide No. LC19226, 26a, enlarged cornutus; 27, P. brevipalpa, holotype, slide No. DZH12288, 27a, enlarged cornutus; 28, P. libona, holotype, slide No. JYY17787, 28a, enlarged cornutus; 29, P. medilargissima, holotype, slide No. LC19307, 29a, enlarged cornutus; 30, P. ramivalvata, paratype, slide No. DZH10184. Scales = 0.2 mm.