Afronurus costatus ( Navás, 1936 )

Ying, Xiaoli & Zhou, Changfa, 2021, The exact status and synonyms of three Chinese Afronurus Lestage, 1924 established by Navás in 1936 (Ephemeroptera: Heptageniidae), Zootaxa 5082 (1), pp. 95-100 : 98-99

Afronurus costatus ( Navás, 1936)

Heptagenia costata Navás, 1936: 120 , fig. 80 (male, female). Types: male, Kuling , Jiangxi province, China .

Heptagenia costata — Gui 1985: 84; You & Gui 1995: 43, fig. 38 (male).

Cinygmina yixingensis Wu & You, 1986: 280 , figs 1–13 (male, female). Types: male, female, Yixing, Jiangsu Prov. New Synonym .

Cinygmina yixingensis —Wu et al. 1986: 66, figs 23–33 (nymph).

Cinygmina yixingensis — Gui 1985: 86; Zhang & Cai 1991: 237; You & Gui 1995: 53, fig. 52 (male); She et al. 1995: 79; Zhou & Zheng 2003: 758, figs 10, 14, 18 (adults and nymph).

Afronurus yixingensis — Braasch & Jacobus 2011: 65; Zhang et al. 2021:111 .

Remarks: The males of this species have a remarkable projection between the penes ( Fig. 3C ), which is clearly showed in the original picture of Navás (1936) ( Fig. 3A ). The color patterns between the original drawing and our fresh materials are also consistent ( Figs. 3A, 3B ), so we state that the two species established by Navás in 1936 and Wu & You in 1986 are conspecific. Therefore, we propose the following synonymy: Heptagenia costata Navás, 1936 (= Cinygmina yixingensis Wu & You, 1986 ).

Neotype designation for Afronurus costatus ( Navás, 1936) : male imago, China, Jiangxi Province, Wu-Yuan County, Qing-Hua Town (29°41′55.49″ N, 117°78′11.82″ E), 2-VIII-2015, collected by Juanyan Luo, Junzhi Sun, Yike Han. The neotype designed here was collected from the same province and in a very nearby locality of the original types, and has typical characters mentioned in the original description.

Other material examined: 8 male imagoes, 2 female imagoes, same as the neotype; male imago (holotype of Cinygmina yixingensis Wu & You, 1986 ), Jiangsu Province, Yi-Xing City, Ming-Lin Town (31°10′5.02″ N, 119°40′17.52″ E), 25-VII-1980, collected by Tian Wu ; 10 male imagoes, 2 male subimagoes, 6 female imagoes (paratypes), same as the holotype; 12 male imagoes (some reared from mature nymphs), 15 female subimagoes, 40 nymphs, Hainan Province, Ba-Wang-Ling National Forest Park (19°06′37.61″ N, 109°17′05.81″ E), 12-IX- 2014, collected by Qin Si, Junzhi Sun, Juanyan Luo ; 100 nymphs, Anhui Province, Huang-Shan City, Tang-Kou Town, Zhai-Xi Village (30°05′44.39″ N, 118°16′78.03″ E), 29-V-2014, collected by Dan Zhou, Junhi Sun, Yike Han; 6 male imagoes, 7 female imagoes, Zhejiang Province, Long-Quan City , Long-Nan Town , Shuang-Xi Village (27°88′69.49″ N, 119°21′56.56″ E), 5-VIII-2020, collected by Zhenxing Ma, Xuhongyi Zheng.

Distribution: Most areas of Chinese mainland except the Qinghai-Tibet Plateau.

Figures

FIGURE 3. Abdomen of Afronurus costatus (Navás, 1936) male imago. A: Original drawing from Navás (1936). B: Dorsal view. C: Genitalia (ventral view). Scale bars: B = 1.0 mm; C = 0.5 mm.