Epeorus (Proepeorus) nipponicus ( Uéno, 1931 )

Ma, Zhen-Xing, Lei, Zhi-Ming, Li, Wen-Juan & Zhou, Chang-Fa, 2021, A revision of Epeorus (Proepeorus) in China, with descriptions of two new species (Ephemeroptera, Heptageniidae), Journal of Natural History 55 (17 - 18), pp. 1131-1159 : 1133-1136

publication ID	https://doi.org/ 10.1080/00222933.2021.1936679
persistent identifier	https://treatment.plazi.org/id/650487C7-FF9B-FF8E-FE93-FAFAFC97FA94
treatment provided by	Plazi
scientific name	Epeorus (Proepeorus) nipponicus ( Uéno, 1931 )
status

Treatment

Epeorus (Proepeorus) nipponicus ( Uéno, 1931) View in CoL

Figs 1A–C View Figure 1 , 6B View Figure 6 , 12C View Figure 12 , 13C View Figure 13 , 14E–F View Figure 14 , 15A, I View Figure 15 , 16C View Figure 16

Epeorus nipponicus Uéno, 1931, p. 97 View in CoL , Figure 4 View Figure 4 (male imago). Types: male imago, from Japan .

Epeorus curvatulus View in CoL (nec Matsumura, 1931): Imanishi 1934, p. 392, Figure 3 View Figure 3 (male, female, nymph); Imanishi 1940, p. 250, Figure 38 (nymph, first record from China); Bae 1997, p. 410; Bae and Liu 1999, p. 5; Quan et al. 2002, p. 253. Synonymised by Ishiwata 2001, p. 74.

Materials examined

Six male imagoes, Yalu River (668 m a.s.l.), Boketu Town , Yakeshishan City , Inner Mongolia, collected by Chang-Fa ZHOU, Hui XIE, 2-VIII-2007; 1 female imago, Zhuoer River (755 m a.s. l.), Taerqi Town , Yakeshishan City , Inner Mongolia, collected by Chang-Fa ZHOU, Hui XIE, Shi-Lei WANG, 4-VIII-2007; 30 nymphs, Wangyedian (1288 m a.s.l.), Kelaqi , Chifeng City , Inner Mongolia, collected by Yu-Xuan ZHU, Xue-Fen GAO, Wei-Jie SUN, 25-VII-2014; 4 female imagoes, Songjianghe Town , Fusong County, Jilin Province, collected by Shi-Lei WANG, Gui ZHAO, 28-VII-2008; 30 nymphs, Dadingshan Forest Park, Raohe County , Heilongjiang Province, collected by Juan-Yan LUO, Wei ZHANG, Ze HU, 20-VII-2016 .

Diagnosis and remarks

Nymph of this species can be characterised by conspicuous paired C-shaped markings near frontal margin of head ( Figure 1 View Figure 1 (b)) and brownish median line with a pair of submedian brownish spots on each abdominal tergum from segments III–VIII ( Figure 1A, C View Figure 1 ). In adults, it can be distinguished from other congeners by the rounded and laterally expanded penis lobes of male imago ( Figures 12 View Figure 12 (c) and 13(c)) and trapezoidal subgenital plate of female imago ( Figure 14 View Figure 14 (e,f)). Epeorus (Proepeorus) anatolii Sinitshenkova, 1981 have the similar characters in nymphal (e.g. the colouration pattern of abdominal terga) and imaginal stages (e.g. shape of penes, see Sinitshenkova 1982: Figure 1 View Figure 1 ). Although we can distinguish E. (P.) anatolii from E. (P.) nipponicus by the absence of C-shaped markings on head capsule, assuming the variability of colouration in nymphs, the relationship of these two species should be confirmed upon further more detailed morphological comparison and molecular evidence.