Amphinemura borealis (Morton, 1894)

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 31-32

Amphinemura borealis (Morton, 1894)

SYNONYMY

Nemoura borealis Morton, 1894

Amphinemura borealis Claasen, 1940

TYPE LOCALITY: Finland .

DIAGNOSIS: Adults do not retain remnants of nymphal gills in the cervical region and have only small whitish stubs at the point of insertion, unlike A. standfussi Ris, 1902 which has longer fingerlike gill remnants. From the dorsal view, the male epiproct is relatively uniform in width ( Fig. 155). In lateral view, however, the epiproct is bent abruptly at the tip, appearing truncate ( Fig. 156). This bend points ventrally at a 45 degree angle, in contrast to the tip in A. standfussi which forms a point that is directed anteriorly ( Fig. 160). The epiproct of A. borealis is long and extends further down than abdomen than in A. standfussi ( Fig. 161). Both sternum 7 and 8 of the female are well sclerotized and parabolic in shape ( Fig. 157). Nymphs have long hairs on femora and cercal segments and the hairs of A. borealis are much longer and denser than those in A. standfussi.

DISTRIBUTION—Global: Trans-Palearctic— Regional: AOB, IDB, POB*— Aimag: AR, BO, BU, DO*, KhD*, KhE*, KhG, OV^, SE, UB, ZA^.

DISCUSSION: We typically collected A. borealis from mid-size, low gradient streams. However, we also found it in a marshy habitat at one location in the western Altai mountains.