Sepedon senex Wiedemann, 1830

Li, Zhu & Yang, Ding, 2017, Sepedon (Diptera: Sciomyzidae) species from China, with notes on taxonomy and distribution, Zootaxa 4254 (3), pp. 301-321 : 312-315

6. Sepedon senex Wiedemann, 1830

( Figs. 52–60 )

Sepedon senex Wiedemann, 1830 . Ausser. Zweifl. Ins. 2: 578. Type locality: not given.

Diagnosis. Female ( Fig. 52 ). Frons mainly yellowish brown, only darker brown around orbital setae ( Fig. 53 ). Parafacial spots and orbital spots absent ( Fig. 54 ); frons with pair of posterior orbital setae. Antennal scape yellowish brown, distinctly lighter than pedicel ( Fig. 54 ). Fore tibia and basitarsus normal in both sexes. Thorax mainly black except yellow upper margin of pleuron. Scutellum with pair of apical scutellar setae. Wing infumated, usually with darker anterior portion and apex ( Fig. 52 ). Male similar to female in external characters except terminalia.

Male terminalia: Sternum 5 divided into two subtriangular sclerites ( Fig. 55 ). Cercus elongated, rod-like ( Fig. 56 ). Surstylus similar to that of S. plumbella , sickle-like in caudal view ( Fig. 56–57 ). Hypandrium with a deep cleft at outer edge ( Fig. 58 ). Cochleate vesicle present ( Fig. 56–57 ). Aedeagus and apodemes as shown in Figs. 59–60 .

Specimens examined. CHINA: Hainan: Baoting , 80 m, 1960 . V. 15, Chang-Qing Li (1♀, IZCAS), 80 m, 1960 . V. 19, Zhen-Fu Li (1♀, IZCAS), 80 m, 1960 . V. 19, Zhen-Fu Li (4♂ 7♀, IZCAS); Tongshen , 340 m, 1960 . III. 26, Zhen-Fu Li (1♂, IZCAS), 340 m, 1960 . IV. 22, Chang-Qing Li (1♀, IZCAS), 340 m, 1960 . IV. 25, Xue- Zhong Zhang (1♀, IZCAS), 340 m, 1960 . IV. 25, Xue-Zhong Zhang (2♂ 2♀, IZCAS), 340 m, 1960 . IV. 26, Xue- Zhong Zhang (1♂, IZCAS), 340 m, 1960 . IV. 27, Zhen-Fu Li (1♂, IZCAS), 340 m, 1960 . IV. 27, Zhen-Fu Li (4♂ 1♀, IZCAS), 340 m, 1960 . VI. 26, Xue-Zhong Zhang (1♂, IZCAS); Wanning , 10 m, 1960 . IV. 10, Chang-Qing Li (1♂, IZCAS), 10 m, 1960 . IV. 10, Xue-Zhong Zhang (1♂, IZCAS), 10 m, 1960 . IV. 13, Xue-Zhong Zhang (1♂, IZCAS), 10 m, 1960 . IV. 14, Xue-Zhong Zhang (4♂ 2♀, IZCAS), 10 m, 1960 . IV. 15, Chang-Qing Li (1♀, IZCAS), 10 m, 1960 . IV. 15, Chang-Qing Li (2♂, IZCAS); Yinggen , 200 m, 1960 . VII. 9, Chang-Qing Li (1♂, IZCAS). Yunnan: Xishaungbanan , 650 m, 1958 . IV. 3, Shu-Yong Wang (1♀, IZCAS); Yiwu , 650 m, 1958 . X. 23, Shu-Yong Wang (1♂, IZCAS).

Distribution. China (Yunnan, Hainan, Taiwan, Hong Kong); Thailand, Burma, Sumatra, Malaya, India, Philippines, Java. Oriental Region ( Yano, 1968; Steyskal, 1980).

Remarks. This species is similar to S. plumbella in external characters, especially in females. In S. senex the fore basitarsus of both sexes are normal in appearance, so it is not easy to distinguish between females of S. plumbella and S. senex at first glance. Characters for separating the two species are as shown in couplet 4 of the key.

Figures

FIGURES 52 – 60. Sepedon senex Wiedemann. 52. Female habitus, lateral view. 53. Frons, frontal view. 54. Head, lateral view. 55. Sternum 5. 56. Male postabdomen (cochleate vesicle inside), caudal view. 57. Male postabdomen (cochleate vesicle inside), lateral view. 58. Hypandrium (left part), lateral view. 59. Aedeagus and apodemes, lateral view. 60. Aedeagus and apodemes, ventral view.