Ripeacma bitriangulata 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 : 526-527

publication ID	https://doi.org/ 10.11646/zootaxa.5168.5.2
publication LSID	lsid:zoobank.org:pub:F0B8BD09-854A-4D53-BC9A-FE106F18D525
DOI	https://doi.org/10.5281/zenodo.6911469
persistent identifier	https://treatment.plazi.org/id/03C787D9-F167-FF98-DB85-FABBFE0C1DC5
treatment provided by	Plazi
scientific name	Ripeacma bitriangulata Wang
status	sp. nov.

Treatment

Ripeacma bitriangulata Wang , sp. nov.

( Figs 6 View FIGURES 3–8 , 18 View FIGURES 15–20 , 28 View FIGURES 27–32 )

Type material. CHINA, Hainan: Holotype ♂, Hongkan (19.08°N, 100.34°E), Yinggeling, 540 m, 17.III.2016, leg. QY Wang et al., slide No. ZXJ18372. GoogleMaps

Paratypes: Hainan: 3♂ 6♀, same data as holotype except dated 15‒17.III.2016, slide Nos. LiSR16260 GoogleMaps ♂, LJ17552 ♂, XZX20240 ♂, XZX20241 ♀, LiSR16223 ♀, LiSR16287 ♀, ZXJ18441 ♀, ZXJ19009 ♀; Guangxi : 1♀, Mt. Tianping, Huaping , Longsheng County, 767 m, 18.VIII.2020, leg. H Sun et al., slide No. XZX20249 .

Diagnosis. The new species can be distinguished from other described species of the genus by the juxta triangularly produced posterolaterally, the clubbed saccus, and the aedeagus with a slender process that exceeds the apex of the aedeagus.

Description. Adult ( Fig. 6 View FIGURES 3–8 ). Wingspan 9.5 − 12.0 mm.

Head yellow, sparsely tipped with greyish brown. Labial palpus in male with first palpomere black, second palpomere yellow with black scales; in female yellow, first palpomere with black scales, second palpomere ringed with black at middle and near apex.Antenna yellow on ventral surface; scape mottled with black scales and flagellum black and yellow on dorsal surface.

Thorax and tegula black basally, yellow distally. Forewing yellow, with yellowish brown scales; costal margin with dense black scales along basal 1/3, forming an ill-defined band, with three black spots evenly spaced from before middle to distal 1/4; terminal dots black, running from apex along termen to tornus; discal, discocellular and plical stigmata black; tornal spot black, diffused; fringe greyish black. Hindwing and fringe grey. Legs yellow; coxa of fore- and hindlegs black on ventral surface; on dorsal surface, tibia of foreleg black, ringed with yellow at apex, tarsus black at middle of first tarsomere and at base of second tarsomere as well as on entire third and fourth tarsomeres; tibia of midleg black, with yellow streak at basal 1/3, at middle and apex, tarsus black at middle of first tarsomere and on entire other tarsomeres; all femora black; on outer surface, tibia of hindleg black, with yellow streak at middle and apex, tarsus black at base of each tarsomere.

Male genitalia ( Fig. 18 View FIGURES 15–20 ). Uncus sub-trapezoidal, wide at base, narrowed from base to basal 2/3, contracted at distal 1/3, with a seta set laterally before contraction, distal 1/3 horizontally fusiform, extended outward from middle and narrowed to lateral margin. Gnathos as long as uncus; ventral plate composed of two spine-shaped lobes, each lobe extending horizontally outward from middle to pointed tip, concave anteromedially; basal arm widely banded, longer than width of ventral plate. Tegumen roundly arched on posterior margin, widened to posterior 3/5, with a large triangular emargination; lateral arm shorter than median width. Valva narrowly elongate, bent inward, sub-parallel sided, obtusely rounded at apex, with a line of setae running from basal 1/4 to 1/2 above ventral margin; costa banded, narrowed distally, not reaching tip of costal margin; transtilla lobes rod-shaped; sacculus less than 2/5 length of valva, triangular, heavily sclerotized and horn-shaped distally. Saccus clubbed. Juxta widened posteriorly, narrowed medially; posterior half gradually widened, posterior margin deeply concave medially, forming two triangular lobes; anterior half represented by two slender lateral bands, produced in triangle anterolaterally. Aedeagus slightly shorter than valva, slightly inflated from base to basal 2/5, then tapered to basal 2/3, distal 1/3 heavily sclerotized, produced triangularly to acute apex; with two processes: one from beyond lateral 1/3 extending dorsad and fused at its middle length, forming a spine-shaped process reaching basal 2/3 length of aedeagus; another arising from distal 1/3, slender, apically exceeding apex of aedeagus.

Female genitalia ( Fig. 28 View FIGURES 27–32 ). Apophyses anteriores less than 1/2 length of apophyses posteriores. Eighth tergum rectangular, straight on posterior margin; eighth sternal plate concave in U shape medially on posterior margin, forming two hillock-like lobes. Lamella antevaginalis large, circular, exceeding antrum anteriorly. Antrum shorter than 1/3 length of ductus bursae, posterolaterally extended as a wide sclerotized band. Ductus bursae thickened and granulate anteriorly, narrowed near corpus bursae. Corpus bursae about 4/5 length of ductus bursae, elliptical; signum obovate, margined with dense denticles.

Distribution. China (Hainan, Guangxi).

Etymology. The specific epithet is derived from the Latin bi - and triangulatus, referring to the shape of the two posterior lobes of the juxta.