Epeorus ( Proepeorus ) bifurcatus Braasch & Soldán, 1979

Epeorus ( Proepeorus) bifurcatus Braasch & Soldán, 1979 View in CoL

Figs 5E–F View Figure 5 , 6E, H View Figure 6 , 15C View Figure 15 , 16J View Figure 16

Epeorus bifurcatus Braasch & Soldán, 1979, p. 270 View in CoL , Figures 15 View Figure 15 –22 (nymph). Types: nymph, from Vietnam .

Epeorus bifurcatus: Nguyen and Bae 2004, p. 21 View in CoL (nymph); Braasch and Boonsoong 2010, p. 23 View Cited Treatment .

Materials examined

2 nymphs, Pingshan County, Yibin City, Sichuan Province, collected by Bei-Xin WANG, 19- XI-2019; 20 nymphs, Baijin Town, Huishui County , Guizhou Province, collected by Chang- Fa ZHOU, 11-IX-2000; 30 nymphs, Dali Ancient City, Yunnan Province, collected by Jia- Chang QIN, Peng LI, 25-VII-2009 .

Diagnosis and remarks

E. ( P.) bifurcatus is recognised among Asian Epeorus species by a pair of small submedian spines on terga II–IX ( Figure 5 View Figure 5 (e,f)), a row of blunt denticles along posterior margin of terga and triangular gill I ( Figure 6 View Figure 6 (e,h)). This species most resembles E. ( P.) bispinosus in the paired submedian spines on terga and triangular gill I, but E. ( P.) bispinosus can be distinguished from it by the acute denticles along the posterior margins of terga. Shape of submedian spines of E. ( P.) bifurcatus are variable: more developed and sharper in some individual. Adults are unknown.

Distribution

China ( Yunnan, Guizhou, Sichuan), Vietnam, Thailand.