Asiagomphus pacificus Chao 1953

Wilson, Keith Duncan Peter & Xu, Zaifu, 2009, Gomphidae of Guangdong & Hong Kong, China (Odonata: Anisoptera) 2177, Zootaxa 2177, pp. 1-62 : 13

Asiagomphus pacificus Chao 1953

Figs. 2 (a–d)

Gomphus pacificus Chao 1953 : Chao (1953: 410–413, figs 37–42, type-loc. Fujian); Asahina (1966: 112–113, figs 17– 21, Fujian, Taiwan); Matsuki (1978: 142 [list]); Lieftinck et al. (1984: 33, Fujian, Taiwan); Sui & Sun (1984: 43–44, figs 33a–d, Fujian & Taiwan); Zhu (1989: 47, Zhejiang).

Asiagomphus pacificus (Chao 1953) : Matsuki & Lien (1988: 33, Taiwan); Chao (1990: 97–99, figs 1–13, Fujian, Taiwan & Zhejiang); Zhang (1999: 223–224, figs 26.47a–f, Fujian, Taiwan & Zhejiang); Hua (2000: 10, Fujian, Henan, Hunan, Taiwan & Zhejiang); Fellowes et al. (2003a: 36, Guangdong: Nanling); Wilson (2005: 131–134, figs 14a–d, Guangxi).

Asiagomphus sp. : Wilson (1999: 35–36, figs 19–20, Guangdong: Dinghushan).

Asiagomphus hainanensis (not of Chao 1953a): Chan et al. (2004a: 39, Guangdong: Dachouding).

Specimens: 12 ♂, Dadingshan , Nanling, 30 vi 2000, coll. KW ; 1 ♂, Dadingshan , Nanling, 1 vii 2000, coll. KW ; 2 ♂, Longtanjiao , Nanling, 2 vii 2000, coll. KW ; 1 ♂, Longtanjiao , Nanling, 3 vii 2000, coll. KW ; 1 ♂, Longtanjiao , Nanling, 3 vii 2000, coll. KW ; 2 ♂, Chengjia , Nanling, 5 vii 2000, coll. KW ; 2 ♀, Maoping , Nanling, 6 vii 2000, coll. KW ; 1 ♂, Dachouding , 18 iv 2001, leg. GR ; 1 ♂, 1 ♀ ( Nos. 20050 & 20051), Dinghushan, 6 iv 2002, coll. ZX ; 3 ♂ ( Nos. 20320, 20304, 20191), Liuqihe, 14 iv 2002, coll. ZX ; 1 ♂, Ehuangzhang , 1 v 2002, coll. ZX ; 3 ♂ ( No. 21570), Xiangtoushan, 19 v 2002, coll. ZX ; 3 ♂, 2 ♀ ( No. 22177), Chebaling, 25–26 v 2002, coll. ZX ; 1 ♂, Liuqihe , 24–28 vi 2002, coll. ZX ; 1 ♀ ( No. 24967), Nankunshan, 12 v 2004, coll. ZX ; 1 ♂, Luofushan , 8 viii 2004, coll. KW ; 1 ♂ ( No. 21346), Baiyung, coll. ZX .

Remarks: Asiagomphus pacificus is significantly larger and slightly bulkier species than A. hainanensis Chao and its males feature a uniformly straight occipital margin without any small spines. Its antehumeral stripe may be complete or interrupted in the middle as illustrated in Fig. 2b and its labrum is entirely black ( Fig. 2a). The female occipital margin may also be uniformly straight or feature a very small v-shaped notch in the centre which is more noticeable when viewed dorsally ( Figs. 2c–d). Asiagomphus hainanensis has a pair of yellow baso-lateral spots on the labrum and the male has a slightly curved occipital margin beset with small spines ( Fig. 2e) and the upper metakatepisternum is yellow ( Fig. 2f). Topotypical female A. hainanensis , as pointed out by Wilson & Reels (2001), has an occiptal margin which is arched, beset with small spines and has a prominent central notch ( Figs. 2g –h).

Distribution: China (Fujian, Guangdong, Guangxi, Henan, Hunan, Taiwan & Zhejiang).