Epeorus (Proepeorus) bispinosus Braasch, 1980

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 : 1142-1143

Epeorus (Proepeorus) bispinosus Braasch, 1980

Figs 5C–D , 6F , 15F , 16K

Epeorus bispinosus Braasch, 1980, p. 60 , Figure 3 (b–l) (nymph). Types: nymph, from Nepal .

Epeorus (Epeorus) bispinosus: Kluge 1997, p. 205 . Materials examined

3 nymphs, Tengchong County, Baoshan City, Yunnan Province, collected by Ran LI, 22–23- VIII-2020; 4 nymphs, Yaojiaping, Lushui City, Yunnan Province, collected by Ran LI, 20-VIII -2020 .

Diagnosis and remarks

The nymph of E. (P.) bispinosus can be distinguished from other congeners by the paired sharp and slender spines ( Figure 5 (c,d)) and the pointed denticles on abdominal terga ( Figure 6 (f)). This species was described based on nymph by Braasch (1980) and other stages are unknown. Kluge (1997, 2004) regarded this species as a member of Epeorus s. str. In this work, this species is temporarily classified into Proepeorus because it is closely related to E. (P.) aculeatus .

Distribution

China (Yunnan), Nepal, Tajikistan.

Figures

Figure 3. Mouthparts of Epeorus (Proepeorus) gibbus sp. nov. (digital photos): (a) Labrum; (b) Left mandible; (c) Right mandible; (d) Hypopharynx; (e) Maxillae; (f) Labium.

Figure 5. Nymphal habitus and abdominal terga of Epeorus (Propeorus) spp.: A–B: E. (P.) aculeatus, (a) Nymphal habitus, (b) Abdominal terga VII–X; C–D: E. (P.) bispinosus, (c) Nymphal habitus, (d) Abdominal terga VII–X; (e, f): E. (P.) bifurcatus, (e) Nymphal habitus, (f) Abdominal terga VII–X; (g, h) E. (P.) rhithralis, (g) Nymphal habitus, (h) Abdominal terga VII–X.

Figure 6. Nymphal structures of Epeorus spp.: (a–c) Labrum, (a) Epeorus (Epeorus) melli, (b) Epeorus (Propeorus) nipponicus, (c) E. (P.) unispinosus; (d, e) Gill I, (d) E. (P.) unispinosus, (e) E. (P.) bifurcatus; (f–h) Posterior margin of tergum VII, (f) E. (P.) bispinosus, (g) E. (P.) rhithralis; (h) E. (P.) bifurcatus.

Figure 15. Mouthparts of Epeorus (Proepeorus) spp.: (a–f) labrum, (a) E. (P.) nipponicus; (b) E. (P.) unispinosus; (c) E. (P.) bifurcatus; (d) E. (P.) aculeatus; (e) E. (P.) rhithralis; (f) E. (P.) bispinosus; (g–i) base of apical tooth complex of maxilla, (g) E. (P.) gibbus sp. nov.; (h) E. (P.) falcatus sp. nov.; (i) E. (P.) nipponicus.

Figure 16. Incisors of left mandible in ventral view: (a) Epeorus (Epeorus) melli; (b) Epeorus nguyeni; (c) Epeorus (Proepeorus) nipponicus; (d) Epeorus (Belovius) pellucidus; (e) Epeorus (Proepeorus) unispinosus; (f) Epeorus (Proepeorus) gibbus sp. nov.; (g) Epeorus (Iron) alexantri; (h) Epeorus (Proepeorus) falcatus sp. nov.; (i) Epeorus (Proepeorus) aculeatus; (j) Epeorus (Proepeorus) bifurcatus; (k) Epeorus (Proepeorus) bispinosus; (l) Epeorus (Proepeorus) rhithralis.