Issikiopteryx obtusangula Fan & Li

Fan, Ximei & Li, Houhun, 2008, The genus Issikiopteryx (Lepidoptera: Lecithoceridae): Checklist and descriptions of new species, Zootaxa 1725, pp. 53-60 : 56-58

Issikiopteryx obtusangula Fan & Li , sp. nov.

( Figs. 1 b, 3a–c)

Type material. Holotype: ɗ, China: Mt. Fanjing (27°55'N, 108°41'E), Guizhou Province, 1300 m, 3.viii.2001, coll. Houhun Li and Xinpu Wang, genitalia slide No. FXM07048. Paratypes: 3 ɗ, 7 Ψ, 1– 3.viii.2001, other data same as for holotype; 2 ɗ, Daozhen (28°53'N, 107°36'E), Guizhou Province, 1370 m, 20, 25.viii.2004, coll. Yunli Xiao; 4 ɗ, Sangzhi County (29°23'N, 100°11'E), Hunan Province, 1250 m, 13.viii.2001, same collector as holotype.

Diagnosis. This species can be distinguished from other known species of the genus by the sacculus with two or three small distal spines and the eighth sternite with caudal processes obtusely rounded apically in the male genitalia; the antrum short, the lamella antevaginalis and ductus bursae relatively narrower in the female genitalia.

Description. Adult ( Fig. 1 b): Wing expanse 11.0–12.5 mm. Head with vertex yellow, frons shiny white. Labial palpus pale yellow, slightly whitish on inside of second segment. Antenna yellowish gray. Thorax and tegula orange yellow. Forewing with termen straight; ground color yellow to orange yellow, with a small black spot at base, and a large, ovate silvery gray blotch situated at basal 1/3, surrounded by dark brown and deep brownish yellow scales; distal 2/5 with a few longitudinal dark brown streaks extending to near apex, forming a large blotch; cilia yellow along apex and termen, gray on tornus. Hindwing and cilia whitish yellow. Legs whitish on ventral surface, yellow or pale brownish yellow on dorsal surface, with conspicuous black speckles on hind tarsus. Abdomen yellow dorsally, white ventrally.

Male genitalia (Fig. 3a): Uncus lobe with basal 3/4 rectangular, distal 1/4 bilobed and widely apart, rounded apically. Gnathos narrow, hooked distally. Valva with basal 2/3 broad, narrowed at 2/3; cucullus somewhat elongate oval, bluntly rounded at apex, armed with numerous bullet-like spines ventrally; costal bar gently arched. Sacculus broad, longer than half length of valva, with two or three apical spines. Juxta somewhat oval, slightly concave on caudal margin, with pair of long spine-like processes caudo-laterally. Aedeagus nearly same thickness throughout, with numerous short spines along ventral margin distally; apex bilobed, dorsal lobe large, roundly dilated, ventral lobe a small spine-like process; cornuti composed of one large and four small spines distributed in distal half.

Eighth sternite (Fig. 3b): Caudal processes short, obtuse apically.

Female genitalia (Fig. 3c): Papillae anales rounded caudally. Apophyses posteriores long, about four times length of apophyses anteriores, its distal 1/3 expanded. Lamella antevaginalis a narrow, rectangular plate, deeply concave on anterior margin. Antrum short. Ductus bursae with posterior 1/3 heavily sclerotized, bearing numerous small and large spines; median portion expanded, arched along left margin, with strong spines inside left portion, gradually narrowed to about 3/4; anterior 1/4 membranous. Corpus bursae ovate, spinulate inside; signum a large lunate plate, placed posteriorly, dentate anteriorly.

Distribution. China (Guizhou, Hunan).

Etymology. The specific name is derived from the Latin word obtusangulus, referring to the eighth sternite with caudal processes bluntly angled apically.

FIGURE Issikiopteryx obtusangula Fan & Li , a, male genitalia; b, male eighth sternite; c, female genitalia

Figures

FIGURE 1. Adults of Issikiopteryx spp. a, I. valvispinata Fan & Li, sp. nov.; b, I. obtusangula Fan & Li, sp. nov.; c, I. rotundiconcava Fan & Li, sp. nov.