Ripeacma acerba Wang, 2022

Xu, Zhixin & Wang, Shuxia, 2022, Description of twelve new species of the genus Ripeacma Moriuti, Saito & Lewvanich (Lepidoptera: Autostichidae) from China, Zootaxa 5168 (5), pp. 521-540 : 530-534

Ripeacma acerba Wang , sp. nov.

( Figs 10 , 22 )

Type material. CHINA, Yunnan: Holotype ♂, Linjiapu (25.29°N, 98.70°E), Tengchong, 2144 m, 14.VIII.2014, leg. KJ Teng et al., slide No. LiSR17013.

Diagnosis. The new species is similar to R. hamatispina sp. nov. in male genitalia. It can be distinguished by the sacculus gradually narrowed to pointed apex, and the hillock-shaped juxta with slender curved lateral lobes. In R. hamatispina sp. nov., the sacculus is abruptly narrowed to a digitate process distally, and the broad lateral lobes of the V-shaped juxta are widened distally.

Description. Adult ( Fig. 10 ). Wingspan 13.5 mm.

Head yellowish brown. Labial palpus pale yellow, with dark brown scales. Antenna yellowish brown; scape with black scales, flagellum with black rings on dorsal surface.

Thorax, tegula and forewing dark brown. Forewing with yellow costal spot ill-defined; discal, discocellular and plical stigmata black; fringe greyish brown, tinged with black. Hindwing and fringe grey, tinged with yellow. Legs yellow; on dorsal surface, femur and tibia of foreleg black, tarsus with black scales; tibia of midleg mottled with black scales, tarsus yellowish brown except first tarsomere black; femur of hindleg mottled with black scales at base on outer surface.

Male genitalia ( Fig. 22 ). Uncus weakly sclerotized. Gnathos circular. Tegumen arched, with a large semicircular anterior emargination; lateral lobe longer than median width. Valva slightly widened from narrow base to obtusely rounded apex, densely setose; transtilla lobes expanded near middle, touching each other mesially; sacculus subtriangular, gradually narrowed to pointed apex, extending obliquely dorsad distally. Juxta hillock-shaped; lateral lobe uniformly slender, curved inward at middle, extending obliquely outward distally. Aedeagus thickened from base to basal 2/5, separated distally, forming two subequal lobes: ventral lobe aequilate from base to obtusely rounded apex; dorsal lobe aequilate from base to basal 3/4, then distinctly produced to a narrow digitate process; distal plate heavily sclerotized, as long as 1/3 length of aedeagus, with a triangular process at base, with a ventroapical spine curved obliquely inward.

Female unknown.

Distribution. China (Yunnan).

Etymology. The specific epithet is derived from the Latin acerbus, referring to the apex-pointed sacculus.

Figures

FIGURES 9–14. Adults of Ripeacma spp. 9, R. stigmosa sp. nov.; 10, R. acerba sp. nov.; 11, R. ellipsoidea sp. nov.; 12, R. hamatispina sp. nov.; 13, R. mediprocessa sp. nov.; 14, R. trilobata sp. nov., paratype, ♀. All holotypes and males, except paratype and female for R. trilobata. Scales = 1.00 mm.

FIGURES 21–26. Male genitalia of Ripeacma spp. 21, R. stigmosa sp. nov., slide No. LiSR16228; 22, R. acerba sp. nov., slide No. LiSR17013; 23, R. ellipsoidea sp. nov., slide No. LiSR16270; 24, R. hamatispina sp. nov., slide No. LiSR16284; 25, R. mediprocessa sp. nov., slide No. XZX20421; 26, R. trilobata sp. nov., slide No. XZX20424. All holotypes. Scales = 0.25 mm.