Ripeacma rostratiformis Wang

Li, Suran & Wang, Shuxia, 2017, Description of six new species of the genus Ripeacma (Lepidoptera: Oecophoridae) from China, with a checklist of the world species, Zootaxa 4268 (2), pp. 270-284: 271-274

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Ripeacma rostratiformis Wang

sp. nov.

Ripeacma rostratiformis Wang   , sp. nov.

( Figs 5 View FIGURES 5 – 10 , 11 View FIGURES 11 – 16 )

Type material. CHINA: Holotype ♂, Hainan: Tianchi, Jianfengling (18.73°N, 108.87°E), 787 m, 14.VII.2015, coll. Qingyun Wang, Suran Li & Mengting Chen, genitalia slide No. LiSR15246 GoogleMaps   . Paratypes: Hainan: 1♂, same locality as holotype, 810 m, 30.III.2008, coll. Bingbing Hu & Haiyan Bai, genitalia slide No. LiSR16169 GoogleMaps   ; 4♂, same data as holotype except 14-16.VII.2015, genitalia slide No. LiSR15199 GoogleMaps   ; 1♂, Mt. Limu (19.17°N, 109.73°E), 607 m, 24.VII.2014, coll. Peixin Cong, Linjie Liu & Sha Hu, genitalia slide No. LiSR16055 GoogleMaps   ; 1♂, Jianfengling Nature Reserves, Ledong (18.74°N, 108.87°E), 770 m, 16.VII.2014, coll. Peixin Cong, Linjie Liu & Sha Hu GoogleMaps   ; 3♂, Hongxin Village, Yuanmen Town (19.07°N, 109.52°E), Baisha Country , 445 m, 18-21.III.2016, coll. Qingyun Wang, Suran Li & Shengnan Zhao, genitalia slide Nos. LiSR16222, LiSR16280. GoogleMaps  

Diagnosis. This species can be distinguished from its congeners by the juxta separated into large heavily sclerotized beak-shaped processes posterolaterally, and the aedeagus with paired slender band-shaped processes arising from the basal 1/4. Ripeacma rostratiformis   sp. nov. is similar to R. acuminiptera Wang & Li, 1999   superficially. It can be distinguished by the sacculus thornlike in the distal 1/3 and the aedeagus bifurcated in the distal half. In R. acuminiptera   , the sacculus is thornlike in the distal 2/3, and the aedeagus is spine-like distally.

Description. Adult ( Fig. 5 View FIGURES 5 – 10 ) with wing expanse 9.0 mm. Head pale yellow. Labial palpus in male pale yellow, mixed with black scales on dorsal surface. Antenna pale yellow, scape with black scales, flagellum ringed with brown. Thorax and tegula pale yellow, with scattered black scales. Forewing elongate narrow, apex pointed; yellow, scattered with yellowish brown scales, with dense blackish brown scales ranging along apex and termen; costal margin with five black spots ranging from base to before distal 1/5, basal two spots larger, median two spots closer, outmost one smallest; fold with an ovate spot at middle; tornus with a black spot; cilia yellow, end 1/3 of dorsal margin brown. Hindwing and cilia gray. Fore- and midlegs with coxae and femora yellow, mixed with blackish brown on ventral surface, tibiae yellow on inner surface, blackish brown on outer surface, with a yellow streak at middle and apex respectively, tarsi yellow on inner surface, blackish brown on outer surface except apex of first and second tarsomeres yellow; hindleg yellow, tibia mixed with blackish brown on outer surface, tarsus with each tarsomere blackish brown at base on outer surface.

Male genitalia ( Fig. 11 View FIGURES 11 – 16 ). Uncus broad at base, gradually narrowed to about 3/4; distal 1/4 widened but slightly narrower than base, concave in broad V shape at middle, forming lateral lobes bending ventrad; lateral side sclerotized, with long setae at basal 2/3. Gnathos U-shaped; ventral plate narrowly banded, shallowly concave at middle on anterior margin, triangularly produced to both ends; lateral arms broadly banded. Valva narrowly elongate, subparallel from base to before narrowly rounded apex, with a line of strong setae from about basal 1/3 to 1/2, with long hairs on distal half. Costa banded, narrowed distally, reaching about distal 1/5 of valva; transtilla membranous and expanded medially. Sacculus broad basally, dorsal margin almost perpendicularly truncate ventrad from near base to middle, distal 1/3 distinctly narrowed to pointed apex, thornlike. Saccus triangular, narrowly rounded anteriorly. Juxta narrowly banded in basal 2/3, semicircular in distal 1/3; lateral lobes beak-like, wide at base, narrowed to a point, obliquely extending outward, with a slender and shorter spine-like process arising from its base ventrally. Aedeagus about 1.2 times length of valva, with paired long slender processes at basal 1/4, reaching before middle of aedeagus; distal half bifurcated: dorsal branch slender, shorter, spine-like; ventral branch slightly narrowed from base to before apex, its basal half dentate, distally falciform and bent obliquely dorsad.

Female unknown.

Distribution. China (Hainan).

Etymology. The specific name is derived from the Latin rostratus and the suffix - formis, referring to the beaklike lateral lobes of the juxta.