Irepacma conioxantha ( Meyrick, 1931 ) Meyrick, 1931

Yin, Aihui & Wang, Shuxia, 2014, Species of Periacma, Irepacma and Epiracma from Taiwan (Lepidoptera: Oecophoridae), Zootaxa 3835 (2), pp. 283-291 : 286-288

Irepacma conioxantha ( Meyrick, 1931) comb. nov.

( Figs. 2 , 8 , 13 )

Periacma conioxantha Meyrick, 1931: 192 .

Material examined. Lectotype: ♂, Urai, Taiwan, SI. 3.4.2.1, coll. S. Issiki, slide No. J.F.G.C. 7905 ( BMNH). Additional material from Taiwan: 1 ♂, Kansirei, 25 March 1935, coll. S. Issiki ( USNM); 1 ♂, Taihoku, 9 April 1935, coll. S. Issiki ( USNM); 1 ♀, Taihoku, 14 April 1935, coll. S. Issiki ( USNM); 6 ♀♀, Nantou Hueisun Exp. Forest, 1100 m, 22−24 April 1999, coll. Mey & Ebert ( MNHU); 1 ♀, Nantou Hueisun Exp. Forest, 1100 m, 25−27 April 1999, coll. Mey & Ebert ( MNHU).

Diagnosis. Irepacma conioxantha can be distinguished from its congeners by the male aedeagus bearing dense strong spines. It is similar to I. magnisaccata Wang, 2011 in the male genitalia, but differs from the latter by the costa having a tooth at apex and the aedeagus about as long as the valva; while the costa of I. magnisaccata lacks an apical tooth, and the aedeagus is about twice length of the valva.

Redescription. Imago ( Fig. 2 ). Wingspan 18.0−22.0 mm. Head orange yellow. Labial palpus orange yellow, second segment with scattered brown scales on outer surface, third segment in female about 1/2 length of second segment. Antenna orange yellow; flagellum with dorsal surface blackish brown and orange yellow alternately. Thorax, tegula and forewing orange yellow. Forewing with costal margin gently arched, termen oblique, dorsum slightly arched inwardly before end of fold; orange yellow, tinged with brown; blackish brown spot at middle and at end of fold, respectively; blackish brown stripe extending from upper angle of cell to tornus; cilia with basal portion orange yellow, distal portion blackish brown. Hindwing blackish brown; cilia blackish brown basally, yellowish brown distally. Legs yellow, tibiae and tarsi intermixed with blackish brown speckles on outer surface.

Male genitalia ( Fig. 8 ). Uncus with basal 1/4 triangular; distal 3/4 slender, rod-like, setose. Gnathos weakly sclerotized, nearly membranous. Tegumen inverted U shaped, parallel laterally, blunt on anterior margin. Valva with basal 1/3 parallel sided, distal 2/3 slightly narrowed to bluntly rounded apex, bearing long dense hair-like scales ventrally and distally; sclerotized crescent band extending ventrad from basal 1/3 below costa to middle of valva; costa with basal 1/4 arched dorsad, with a small tuft of setae at basal 1/4, bearing a tooth at apex; ventral margin arched medially. Sacculus triangular, sclerotized and hooked distally, bearing a thorn-like process near base of dorsal margin. Saccus inverted triangular, rounded anteriorly. Juxta with basal 1/2 quadrate, distal 1/ 2 V shaped. Aedeagus with basal 1/5 slender, parallel sided, distal 4/5 nearly rhomboid, distal 2/5 with long stout setae along dorsal and ventral margins.

Female genitalia ( Fig. 13 ). Papilla analis elongate oval, narrowly rounded posteriorly. Apophysis anterioris stout, short triangular, more or less thorn-like. Lamella postvaginalis weakly sclerotized, narrowly band shaped, with long setae; lamella antevaginalis sclerotized, somewhat forming a small pair of semicircles. Antrum wider than long, about 3 times width of ductus bursae, arched outward laterally. Ductus bursae with posterior half sclerotized, anterior half membranous. Corpus bursae long and thin, more than 3 times length of ductus bursae, not distinctly separated from ductus bursae, membranous, with dense granules near anterior part; signum absent.

Distribution. China ( Taiwan).

Remarks. This species was originally placed in the genus Periacma by Meyrick. Its forewings are much broader than those in Periacma , the valva has no process at base of the costa in the male genitalia, and the apophysis anteriores are degenerated to tiny spinous processes in the female genitalia. These are typical characters of Irepacma , based on which we hereby transfer it to Irepacma . The lectotype of this species is deposited in the British Natural History Museum (examined).

Variation. One male specimen from Kansirei is different from others in coloration: Head yellowish white tinged with grayish brown. Labial palpus yellowish white. Thorax, tegula and forewing yellowish white tinged with grayish brown; cilia with basal portion yellowish white, distal portion yellowish brown. Hindwing yellowish brown; cilia yellowish brown basally, pale yellow tinged with yellowish brown distally. We consider the above difference in color as variation within the species since other characters well match this species.

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).