Amphinemura chui ( Wu, 1935 )

Zhao, Meng-Yuan & Du, Yu-Zhou, 2021, A new species and new synonym of Amphinemura (Plecoptera: Nemouridae) from Zhejiang province of China, Journal of Natural History 55 (11 - 12), pp. 699-711 : 700-704

Amphinemura chui ( Wu, 1935)

( Figures 1 – 6 )

Nemoura sinensis: Chu, 1928 , China J., 9: 88. (misidentification, a homonym of N. sinensis Wu, 1926 )

Nemoura chui: Wu, 1935 . Peking Nat. Hist. Bull., 9: 238 (replacement name for A. sinensis Chu, 1928 ).

Nemoura (Amphinemura) chui: Wu, 1938 . Plecopt. Sin., 131. Amphinemura chui: Illies, 1966 . Das Tierreich, 82: 179; Baumann, 1975. Smithson. Contrib. Zool., 211: 12; Yang, Li & Zhu, 2015. Fauna Sinica Insecta , 58: 180; Yang & Li, 2018. Species Catalogue of China. Vol. 2. animals, Insecta (III) , Plecoptera , 8; Li, Mo, Dong, Yang & Murányi, 2018. Zookeys, 808: 7.

Amphinemura guangdongensis Yang, Li et Zhu, 2004 . Ent. News, 115: 226; Yang, Li & Zhu, 2015. Fauna Sinica Insecta , 58: 207; Yang & Li, 2018. Species Catalogue of China. Vol. 2. animals, Insecta (III) , Plecoptera , 10; Li, Mo, Dong, Yang & Murányi, 2018. Zookeys, 808: 7. [syn. nov.]

Material examined

4♂♂, 8♀♀, China, Zhejiang Province, Deqing County, Mogan Mountain , 124 m, 30°36.293′ N, 119°52.955′E, 2018-IV-18, leg . Huo Qing-Bo & Gao Peng ( ICYZU); 5♂♂, 6♀♀, China, Zhejiang Province, Anji County, Longwang Mountain Power Station , 436 m, 30°24.606′N, 119°24.905′E, 2018-IV-21, leg . Huo Qing-Bo & Gao Peng ( ICYZU); 2♂♂, China, Zhejiang Province, west of Tianmu Mountain , Wuli pavilion, 861 m, 30°20.228′N, 119°26.136′E, 2018-IV-22, leg . Huo Qing-Bo & Gao Peng ( ICYZU); 1♂, China, Zhejiang Province, Qianjiangyuan Forest Park, the lotus pond, 681 m, 29°23.427′N, 118°12.461′E, 2018-IV -24, leg . Huo Qing-Bo & Gao Peng ( ICYZU) .

Type locality

China, Zhejiang Province .

Distribution

China (Zhejiang, Guangdong) .

Description

Male ( Figures 1–4 ). Forewing length 8.0–9.0 mm, hindwing length 6.5–7.5 mm, body length 6.0– 7.5 mm (N = 10). Head, antennae and pronotum dark brown; Legs light brown; Wings hyaline, veins pale yellow. Tergum 9 slightly sclerotised and anterior deeply emarginated, with its posterior covered with several small spines. Hypoproct broad basally and tapering towards blunt rounded tip. Tergum 10 slightly sclerotised, front edge strongly sclerotised with a concave, lateral segment covered with several big black spines and anterolateral with few small spines. Epiproct ‘large and recurved, truncate at the tip and beset with small spinules when viewed laterally, with a small pointed median hook and two recurved lateral processes’ ( Wu 1938). Paraproct divided into 3 lobes; inner lobe slightly sclerotised, bearing hairs; median lobe with hairs medially and sclerotised partly, apex and lateral margin sclerotised distinctly, bifurcate, upper broad lobe darkly sclerous and distally with row of four to six stout, black spines, medially a field of 19–20 socketed setae, lower lobe lightly sclerous, acuminate; outer lobe strongly sclerotised, curved and finger-like.

Female ( Figure 5 ). Forewing length 9.0– 10.5 mm, hindwing length 8.0–9.0 mm, body length 8.0–9.0 mm. Subgenital plate ‘roundedly produced and backward, covering the anterior half of 8th sternite’; Genital ‘opening on the 8th sternite guarded by two large and chitinized vaginal valves with divergent tips’ described by Wu (1938).

Nymph

Unknown.

Remarks

After examining the specimens from Zhejiang province, followed by dissecting the paraprocts and comparing with drawings in the previous literatures, it can be easily found that the examined specimens are the same species as A. chui . However, according to descriptions of A. guangdongensis in Yang et al. (2004) and drawings of A. chui in Chu (1928) and Wu (1938), the morphological characteristics of both males and females are quite similar. Although the type specimens of A. chui have been lost ( Wu 1962) and the individual differences such as the number of small spines or the degree of sclerotisation should be taken into account ( Figures 3–5 ), the crucial diagnostic features are fairly obvious, especially the epiproct and paraprocts of males and subgenital plate of females. Herein, the specimens of A. chui we examined were all collected from Mt. Mogan, Mt. Longwang, west of Mt. Tianmu and Qiangjiangyuan Forest Park of Zhejiang province, all adjacent to the type locality of A. chui Hangzhou. Moreover , the type locality of A. guangdongensis is Ruyuan of Guangdong province, which is not far from Zhejiang, and A. guangdongensis was also recorded in Baishanzu of Zhejiang province. Therefore, from the perspective of geographical distribution, their distribution areas are relatively concentrated in Zhejiang ( Figure 6 ). Hence, we regard A. guangdongensis as a junior subjective synonym of A. chui .

Figures

Figure 1. Amphinemura chui (Wu, 1935). Male adult, (a) head and pronotum, dorsal view; (b) prothorax, cervical gills, ventral view (Longwang Mountain).

Figure 2. Amphinemura chui (Wu, 1935). Male terminalia, (a) ventral view; (b) dorsal view; (c) lateral view (Longwang Mountain).

Figure 3. Amphinemura chui (Wu, 1935). (a) epiproct and paraproct, dorsal view; (b) epiproct, dorsal view; (c) left paraproct, ventral view (Longwang Mountain).

Figure 4. Amphinemura chui (Wu, 1935). Male paraproct, ventral view (Longwang Mountain).

Figure 5. Amphinemura chui (Wu, 1935). Female adult, (a) prothorax, cervical gills, ventral view; (b–c) terminalia, subgenital plate, ventral view (Longwang Mountain).

Figure 6. Distribution map of Amphinemura chui in Zhejiang and Guangdong (the type locality marked in red).