Spinosuncus curvisetaceus, Chen, Kai, Zhang, Dandan & Li, Houhun, 2018

Chen, Kai, Zhang, Dandan & Li, Houhun, 2018, Systematics of the new genus Spinosuncus Chen, Zhang & Li with descriptions of four new species (Lepidoptera, Crambidae, Pyraustinae), ZooKeys 799, pp. 115-151 : 130-131

Spinosuncus curvisetaceus sp. n. Figs 7, 14, 23, 28

Material examined.

Holotype ♂; CHINA, Jiangxi: Mt. Sanqingshan, Jinsha County, Shangrao, alt. 380-390 m, 20.IV.2007, leg. Bai Haiyan and Du Xicui, genitalia slide no. ZDD12058 (NKU). Paratypes: Fujian: 1♂, Tongmu Village, Mt. Wuyishan, 3.V.2014, leg. Yang Xiaofei, genitalia slide no. ZDD12051 (NKU); Jiangxi: 1♂, Shiguling Power Plant, Mt. Sanqingshan, Jinsha County, Shangrao, alt. 410-420 m, 15.IV.2007, leg. Bai Haiyan and Du Xicui, genitalia slide no. CYP12066 (NKU); 6♂, Mt. Sanqingshan, Jinsha County, Shangrao, alt. 380-390 m, 19, 20.IV.2007, leg. Bai Haiyan and Du Xicui, genitalia slides no. CYP12060, 12074, ZDD12026 (NKU); 1♂, Shixi Town, Fengxin, 28.44N, 114.54E, alt. 506 m, 22.IX.2012, leg. Yang Lijun, genitalia slide no. CXH12167; 1♀, Nanfengmian Reserve, Qianmo Village, Suichuan, 26.28N, 114.06E, alt. 816 m, 19.VI.2015, leg. Chen Kai, genitalia slide no. SYSU0061, molecular voucher no. SYSU-LEP0129; Guangxi: 1♂, Jiuniutang, Mt. Mao’ershan, alt. 550 m, 20.IV.2002, leg. Hao Shulian and Xue Huaijun, genitalia slide no. ZDD02245 (NKU); 1♂, Huawang Villa, Jinxiu, alt. 550 m, 13.IV.2002, leg. Hao Shulian and Xue Huaijun, genitalia slide no. ZDD02241 (NKU).

Diagnosis.

Spinosuncus curvisetaceus resembles S. praepandalis in wing pattern. The wingspan of S. curvisetaceus is usually smaller than that of S. praepandalis , S. aureolalis and S. quadracutus , but larger than in S. contractalis , S. rectacutus and S. brevacutus . The ground colour of the wings is paler than that of S. praepandalis . In the male genitalia, it can be differentiated from S. praepandalis by the straight mediobasal margin of the distal teeth of the uncus (curved in S. praepandalis ), the curved setae on the transtilla dorsally (straight in S. praepandalis ) and the expanded, rectangular distal half of sacculus, with sclerotized and densely spinulose dorsal margin. In the female genitalia, the anterior apophysis is thicker than that of S. praepandalis . It can be distinguished from other Spinosuncus species (except S. praepandalis ) by the distally strongly bifid uncus, forming two sclerotized, large excurved teeth bearing hair-like setae basally, two thick needle-shaped setae on the transtilla dorsally and the absence of sclerotized, streak-like or hook-like notches anterolaterally on the sinus vaginalis.

Description.

Head. As for the genus. Thorax. Yellowish brown. Legs as described for the genus. Wingspan 24-26 mm. Wing pattern as in S. praepandalis , ground colour paler than that of S. praepandalis . Abdomen. Yellowish to brown, apical margin of segments tinged with white. Male genitalia (Figure 14). Uncus sharply tapering towards apex; distal half bifid, forming two slightly outwardly curved and sclerotized teeth, basally set with dense setae, arranged in a curved line. Valva of medium width, ventral margin beyond sacculus slightly concave, length approximately 2.1 × its maximal width; transtilla extended ventrally into long and curved projection, set with two thick and curved, needle-shaped setae at base dorsally; costal sclerotized band moderately wide, slightly expanded to 3/4 of dorsal margin; distal half of sacculus expanded, rectangular, with dorsal margin strongly sclerotized and densely spinulose, distally twisted; sella long and slender, rod-like, upcurved, distally set with few broad, fin-shaped setae, each seta with apex evenly divided into several filaments. Juxta shield-shaped, distal half divided medially. Phallus as in S. praepandalis . Female genitalia (Figure 23). Posterior apophysis with hook-like expansion at basal 2/5. Sinus vaginalis without sclerotized, streak-like or hook-like notches; lamella postvaginalis band-shaped, well developed, extended to cover entire eighth segment ventrally. Antrum membranous. Ductus bursae long and slender, more than two times as long as length of corpus bursae; colliculum narrower at anterior end. Corpus bursae small, ovoid; accessory bursa arising from posterior 1/3 of corpus bursae; rhombic signum as in S. praepandalis ; second signum absent.

Etymology.

The specific name is derived from the Latin curv- (curved) and setaceus (setaceous), referring to the curved setae set at the dorsal base of the transtilla.

Distribution.

(Figure 28). China (Fujian, Jiangxi, Guangxi).