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

Isonychia (Isonychia) ussurica sibirica Tiunova et al., 2004: 17 (nymph and adults). Types from Russian Siberia and Mongolia.

Material examined.

5 male imagos, Huma River , Huma County, Heilongjiang Province, China, 51°40.013′N, 126°36.590′E, 170 m, 17-VIII-2007, collected by Shilei Wang, Hui Xie ; 3 nymphs, Heilongjiang, Arctic Village , Mohe County, Heilongjiang Province, China, 122°21.767′E, 53°28.499′N, 287 m, 14-VIII-2007, collected by Shilei Wang, Hui Xie ; 3 male imagos, Nenjiang , Liuyuan, Qiqihar City, Heilongjiang Province, China, 123°57′E, 47°2′N, 1-VIII-2007, collected by Shilei Wang, Changfa Zhou ; 1 male imago, Huma River , Tahe County, Heilongjiang Province, China, 52°18.273′N, 124°41.934′E, 358 m, 16-VIII-2007, collected by Shilei Wang, Hui Xie.

Diagnosis.

The nymph of this species is smaller than others, abdomen without a clear pale line, tergum X with dark posterior half, and free margin of gills decorated with spines (Fig. 13A ). The male of this subspecies is the same as I. ussurica ussurica (see below) except its forewing has no clear band (Fig. 13B-F ).

Description.

See Tiunova et al. (2004).

Distribution.

China (Heilongjiang province), Russian Siberia, Mongolia ( Tiunova et al. 2004).

Figures

Figure 13. Imaginal and nymphal structures of I. ussurica sibirica A nymph (dorsal view) B forewing of male C hindwing of male D male genitalia (ventral view) E penes (dorsal view) F membranous processes (ventral view).