Spinosuncus quadracutus

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: 135-141

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scientific name

Spinosuncus quadracutus

sp. n.

Spinosuncus quadracutus  sp. n. Figs 9, 17-18, 26-27, 28

Material examined.

Type material. Holotype ♂; CHINA, Hainan: Mt. Limushan, 19.16N, 109.73E, alt. 662 m, 20.V.2013, leg. Li Jinwei, genitalia slide no. SYSU0048, molecular voucher no. SYSU-LEP0002. Paratypes: CHINA, Fujian: 1♂, Guadun, Mt. Wuyishan, 27.74N, 117.64E, alt. 1220 m, 17.V.2012, leg. Li Jinwei, genitalia slide no. SYSU0034; Hainan: 2♂, Mt. Limushan, 19.16N, 109.73E, alt. 662 m, 20.V.2013, leg. Li Jinwei, genitalia slide no. SYSU0032; 1♂, 1♀, Jianling Reserve, 18.87N, 110.27E, alt. 143 m, 8.IX.2013, leg. Chen Xiaohua, genitalia slides no. SYSU0029 (♂), SYSU0035 (♀, molecular voucher no. SYSU-LEP0001); 1♀, Mt. Diaoluoshan, 18.65N, 109.93E, alt. 98 m, 3.XI.2013, leg. Chen Kai and Chen Xiaohua, genitalia slide no. SYSU0912; 1♀, Nankai Town, Baisha, 19.05N, 109.24E, alt. 294 m, 19.V.2013, leg. Li Jinwei, genitalia slide no. SYSU0077.


This species is indistinguishable from S. aureolalis  in wing pattern. In the male genitalia, it can be distinguished from S. aureolalis  by the uncus with four prominent pointed spines distally (the median two small and indistinct in S. aureolalis  ), the blunt distal projection of sacculus (pointed in S. aureolalis  ) always set with one long spine pointing towards juxta (often with two long spines in S. aureolalis  , Figure 15C) and the more spinulose and with arched dorsal margin distal projection (smooth, less arched in S. aureolalis  , Figs 15C, 16C). In the female genitalia, it can be differentiated from S. aureolalis  by the more closely set dorsolateral extensions of lamella postvaginalis and relatively larger and more closely set hook-like notches of the sinus vaginalis anterolaterally (Figs 26B, 27B).


Head. Frons brown, vertex with moderately raised scales projecting between antennae, labial palpus brown, white at base ventrally. Maxillary palpus brown, with apex pale yellow. Thorax. Yellow. Legs as described for the genus. Wingspan 26-30 mm. Wing pattern as in S. aureolalis  . Abdomen. Fulvous dorsally, apical margin of segments tinged with white. Male genitalia (Figs 17, 18). Uncus tapering from base to middle; laterally membranous and set with several setae ventrally; otherwise strongly sclerotized; with two caniniform teeth medioventrally; distally with four sharp and slender spines, the lateral two longer, about two times as long as the median two. Valva narrow, as in S. aureolalis  ; transtilla extended ventrally into a long and narrow projection, dorsal margin with sparse setae; costal sclerotized band rather narrow, extended to near distal end of valva; sacculus with central caniniform projection and distal cheliform projection, distal half set with dense setae ventrally, distal projection strongly sclerotized, set with dense and slightly raised spines and one moderately downcurved spine pointing towards juxta; sella short and broad, distally inflated, set with modified setae forming editum, varying form fin-shaped to thick needle-shaped, ventral margin upcurved, thickened and sclerotized, distally spinose, ending in long, curved spine. Juxta shield-shaped, pentagonal, distal margin slightly bifid. Phallus as in S. aureolalis  . Female genitalia (Figs 26, 27). Anterior apophysis sclerotized, slightly sin uate in distal third; posterior apophysis oblong, slender, and strongly sclerotized. Sinus vaginalis with two large, thick, hook-like notches anterolaterally; lamella postvaginalis sclerotized, band-shaped, extended dorsolaterally to approximately 1/3 width of sinus vaginalis. Antrum granulated and broad. Ductus bursae long and moderately wide, about two times as long as diameter of corpus bursae; colliculum well-developed, with anterior end narrower. Corpus bursae globular; accessory bursa arising from posterior end of corpus bursae; rhombic signum with carinae well-developed and connected (Figure 26A) or weak and wide separated (Figure 27A), other two angles densely bearing spines, sometimes smooth medially (Figure 27A); second signum absent.


The specific name is derived from the Latin quadri- (four) and acutus (pointed), referring to the distal uncus with four pointed spines.


(Figure 28). China (Fujian, Hainan)