Periacma spinivalvula Wang & Li, 2006

Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, Journal of Natural History 40 (41 - 43), pp. 2371-2393 : 2389-2390

Periacma spinivalvula Wang & Li , sp. nov.

( Figures 31 , 36 and 45)

Holotype: „, China: Mêdog (29 ° 13 9 N, 95 ° 18 9 E), Tibet Autonomous Region, 12 August 2003, coll. Xinpu Wang and Huaijun Xue, genitalia slide No. W03133.

Paratypes: 3 „„, 5 ♀♀, 10–14 August 2003, same locality data as holotype .

Description: Wing expanse: 9.0–11.0 mm. Head whitish yellow. Labial palpus light yellow; in both male and female second segment with a black ring near end; in female third segment thin and pointed. Antenna yellow; scape black on dorsal surface; flagellum ringed with brown. Thorax, tegula, and fore wing light yellow, with scattered brown scales. Fore wing lanceolate ( Figure 31 ); costal margin gently arched; apex roundly pointed; termen oblique; dark brown blotch from base of posterior margin extending to 1/3 of fore wing at middle; brown fascia from about costal 2/3 to before tornus, broader in anterior and posterior portion, median portion narrow; cilia light yellow except brown on tornus. Hind wing and cilia gray. Legs whitish yellow, tinged with brown on tibiae and tarsi.

Male genitalia ( Figure 36 ): Uncus short, somewhat trapezoidal, laterally with long setae in basal 2/3; caudal margin almost straight. Gnathos with lateral arms and ventral plate short; ventral plate with straight anterior margin. Tegumen large and broad. Valva narrow, nearly parallel-sided from base to distal 2/3, then gradually narrowed to apex; apex with a spine; dorso-proximal process slender, stick-like. Sacculus broad, less than half of valva, with pointed apex. Vinculum narrow. Saccus short, more or less triangular. Aedeagus stout, distally with four apically blunt processes.

Female genitalia (Figure 45): Papilla analis large, broad, somewhat rounded. Apophysis posterioris about four times length of apophysis anterioris. Lamella postvaginalis with caudal margin concave at middle. Ductus bursae thick, not distinctly separated from corpus bursae. Corpus bursae large, with two gear-like signa.

Remarks: This species can be distinguished from its congener by the dorsal spine at the apex of the valva, the dorsally pointed process at the apex of the sacculus, and the four short processes at the distal end of the aedeagus.

Etymology: The specific name is from the Latin prefix spin- (spine) and valvulus (valva), in reference to valva with a spine at apex.

Figures

Figures 24–32. Adults of Periacma spp. (24) P. weishana Wang & Li, „; (25) P. kangdingensis Wang & Li, ♀; (26) P. bifurcata Wang & Li, „; (27) P. immaculata Wang & Li, „; (28) P. plumbea Meyrick, „; (29) P. leyensis Wang & Li, sp. n., „; (30) P. latizona Wang & Li, sp. n., „; (31) P. spinivalvula Wang & Li, sp. n., „; (32) P. rectignatha Wang & Li, sp. n., „.

Figures 33–37. Male genitalia of Periacma spp. (33) P. plumbea Meyrick; (34) P. leyensis Wang & Li, sp. n.; (35) P. latizona Wang & Li, sp. n.; (36) P. spinivalvula Wang & Li, sp. n.; (37) P. rectignatha Wang & Li, sp. n.