Isonychia vshivkovae vshivkovae Tiunova et al., 2004 (first record from China)

Qiang, Xin-He & Zhou, Chang-Fa, 2023, A preliminary review of Isonychia Eaton, 1871 from Chinese mainland with a re-description of I. kiangsinensis Hsu, 1936 (Insecta, Ephemeroptera, Isonychiidae), ZooKeys 1178, pp. 115-141 : 115

Isonychia vshivkovae vshivkovae Tiunova et al., 2004 (first record from China)

Isonychia (Isonychia) vshivkovae vshivkovae Tiunova et al., 2004: 24 (nymph and adults). Types from Russia.

Material examined.

23 male imagos, 3 female imagos, and 70 nymphs, Erdaobaihe Town , Fusong County, Jilin Province, China, 42°26.071′N, 128°06.882′E, 703 m, 23-26-VII-2008, collected by Shilei Wang, Guo Zhao ; 30 nymphs, Songjianghe Town , Fusong County, Jilin Province, China, 42°10.568′N, 127°30.607′E, 685 m, 28-VII-2008, collected by Shilei Wang, Guo Zhao ; 1 male subimago, Songhua River , Fusong County, Jilin Province, China, 42°19.591′N, 127°15.645′E, 423 m, 26-VII-2008, collected by Shilei Wang, Guo Zhao ; 15 nymphs and 3 female imagos, Tou Dao Song Hua Jiang , Man Jiang Zhen , Fusong County, Baishan City, Jilin Province, China, 41.948515°N, 127.590697°E, 10-VIII-2022, collected by Xuhongyi Zheng ; 3 male imagos and 3 female imagos, Toudao Observation Station , Toudaobaihe, Antu County, Jilin Province, China, 42°3809′N, 128°0244′E, 761 m, 23-VIII-2019, collected by Shuang Qiu, Zhengfei Li, Juanjuan Chen, Fengkun Cai ; 9 female imagos and 2 female subimagos, National Highway 201, Sandaobaihe, Antu County, Jilin Province, China, 42°4677′N, 128°2014′E, 640 m, 25-VIII-2019, collected by Shuang Qiu, Zhengfei Li, Juanjuan Chen, Fengkun Cai.

Diagnosis.

The nymph of this species can be identified by its gills without spines along apical margins, body with a longitudinal median pale stripe from head to abdominal tergum IX, and tergum X with a pair of pale spots (Fig. 15A ). The male imago can be differentiated easily by its outer half pigmented forewings, especially pterostigma, MP of hindwing forked equally as MA (Fig. 15B, C ), relatively long and strong penes, apical half of penes slightly expanded and apical margins almost straight, membranous processes between penes and styligers are absent (Fig. 15E-G ), basal half of each foretarsus is pale but apical half dark. Body is uniformly reddish brown to dark brown. Female imago has a similar color pattern of body and foreleg to male, pterostigma of forewing pigmented only, veins are clear. Posterior margin of sternum IX is shallowly concave (Fig. 15D ).

Description.

See Tiunova et al. (2004).

Distribution.

China (Jilin province), Russian Far East ( Tiunova et al. 2004).

Remarks.

Tiunova et al. (2004) divided I. vshivkovae Tiunova et al., 2004 into two subspecies, I. v. vshivkovae and I. v. sinitshenkovae . The former is distributed in the eastern part of Asian Russia and has pigmented forewings. Based upon the pigmented forewings and the collection location, our material is identified as Isonychia vshivkovae vshivkovae .

Figures

Figure 15. Imaginal and nymphal structure of I. vshivkovae vshivkovae A nymph (dorsal view) B forewing of male C hindwing of male D subanal plate of female E male genitalia (ventral view) F penes (dorsal view) G male genitalia enlarged (ventral view).