Nemoura sahlbergi Morton, 1896

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 34-35

Nemoura sahlbergi Morton, 1896

SYNONYMY

Nemoura sahlbergi Morton, 1896

TYPE LOCALITY: Finland .

DIAGNOSIS: The apical prongs of the epiproct ventral sclerite are rounded and gradually taper, terminating with many spines on the apex ( Fig. 186, 187). Like N. nigrodentata ( Fig. 182), the outer (major) lobe of the paraproct is concave ( Fig. 188). The male cerci have an additional anteriorly-directed spine that joins the cercus at a 45 degree angle approximately 0.5 mm below the apex, best seen laterally. The female subgenital plate has a narrow central bump, but this is not particularly diagnostic due to variation within the species. The nymph of N. sahlbergi , like N. arctica , has hairs on the galea, which N. cinerea lacks. N. sahlbergi has short hairs at the corners of the pronotum equal in length to the other hairs along the remainder of the pronotal margin, whereas N. arctica has long hairs at the corners. If distal cercal segments are intact, they lack intrasegmental hairs which N. arctica exhibits.

DISTRIBUTION—Global: Circumpolar— Regional: AOB, POB*— Aimag: AR, BU^, DO*, KhG, TO, UB*.

DISCUSSION: In Mongolia, N. sahlbergi is found in small (1 st to 3 rd order) streams, often associated with springs. This species was first recorded in Mongolia by Raušer (1968) and has been repeatedly documented by Zhiltzova (1975, 1979, 1982).