Epiracma annularis Wang

Yin, Aihui & Wang, Shuxia, 2014, Species of Periacma, Irepacma and Epiracma from Taiwan (Lepidoptera: Oecophoridae), Zootaxa 3835 (2), pp. 283-291 : 290

Epiracma annularis Wang , sp. nov.

( Figs. 6 , 11 , 15 )

Type material. Holotype ♂, Taiwan: Daigyurin, 16 III 1925, coll. S. Issiki, genitalia slide No. 142403. Paratype: 1♀, same data as holotype ( USNM).

Diagnosis. Epiracma annularis can be separated from its congeners by the costa having a trifurcate basal process in the male genitalia. It is similar to E. aedeagifera in appearance and in genitalia, but can be distinguished by the lutescent forewing, the valva with distal 1/2 roundly dilated, and the aedeagus bearing tufted long setae medially. In E. aedeagifera, the forewing is yellowish gray, the valva is elliptically dilated in distal 1/3, and the aedeagus is absent of setae medially.

Description. Imago ( Fig. 6 ). Wingspan 19.0 mm. Head lutescent. Labial palpus pale yellow, second segment with scattered brown scales. Antenna lutescent, with pale brown rings on dorsal surface of flagellum. Thorax, tegula and forewing lutescent. Forewing with scattered pale yellowish brown scales; costal margin arched, apex pointed, termen oblique; pale yellowish brown stripe extending from upper angle of cell to tornus; dim brown spot set at middle of cell and fold, respectively; cilia lutescent, tinged with brown. Hindwing and cilia lutescent; cilia lined with pale brown at basal 1/4. Legs lutescent.

Male genitalia ( Fig. 11 ). Gnathos a circular ring, with dense spinules. Tegumen with each branch gradually widened anteriorly. Valva narrow basally, gradually widened to middle, distal 1/2 roundly expanded, with long dense setae; costa with a trifurcate basal process, dentate on dorsal margin. Sacculus narrowly band shaped, curved upward in S shape, acute apically. Saccus broad triangular, rounded anteriorly. Juxta with basal half semicircular; distal half broadly concave inward at middle, forming two triangular lateral lobes, each lobe acuminate. Aedeagus slightly shorter than valva, basal 1/3 thin, near middle arched and tufted with dense long setae dorsally; distal half even, parallel sided, bearing a row of sparse long setae, with tuft of long setae apically.

Female genitalia ( Fig. 15 ). Papilla analis wide, conical, setose. Apophysis anterioris stout, less than half length of apophysis posterioris. Lamella postvaginalis mound-like, concave inwardly at middle, with stout long setae; lamella antevaginalis consisting of two arched sclerotized plates. Antrum with posterior half expanded in triangle laterally, anterior half parallel sided. Ductus bursae with posterior 1/3 sclerotized, anterior 2/3 membranous. Corpus bursae elliptical, shorter than ductus bursae; signum small elliptical, with dense tiny teeth, bearing a larger spinous process anteriorly.

Distribution. China ( Taiwan).

Etymology. The specific name is from the Latin annularis , referring to the shape of the gnathos.

Fund. This study is supported by the National Natural Science Foundation of China (No. 31372241 and No. J1210005).

Figures

FIGURES 1 − 6. Adults of Periacma, Irepacma and Epiracma spp. 1. P. aduncata sp. nov., paratype, female; 2. I. conioxantha comb. nov. male; 3. I. flagellata sp. nov., holotype, male; 4. Head of I. flagellata sp. nov., paratype, male; 5. E. longicaudata sp. nov., holotype, male; 6. E. annularis sp. nov., holotype, male. (Scales: 1 - 3, 5 - 6 = 2.0 mm; 4 = 0.5 mm).

FIGURES 7 − 11. Male genitalia of Periacma, Irepacma and Epiracma spp. 7. P. aduncata sp. nov., holotype, slide no. 142393; 8. I. conioxantha comb. nov.; 9. I. flagellata sp. nov., holotype, slide no. 142399; 10. E. longicaudata sp. nov., holotype, slide no. YAH 13065; 11. E. annularis sp. nov., slide no. 142403. (Scales = 0.5 mm).

FIGURES 12 − 15. Female Genitalia of Periacma, Irepacma and Epiracma spp. 12. P. aduncata sp. nov., paratype, slide no. 142409; 13. I. conioxantha comb. nov.; 14. I. flagellata sp. nov., paratype, slide no. YAH 13062; 15. E. annularis sp. nov., paratype, slide no. 142404. (Scales = 0.5 mm).