Isoperla (Zwick & Surenkhorloo, 2005)

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 45-46

Isoperla

DIAGNOSIS: Males have no external epiproct and the only apparent terminalia are hook-like subanal lobes. These characteristics of the male terminalia are similar to the genus Kaszabia , but Isoperla males lack the additional abdominal processes found in Kaszabia . Female subgenital plates are variably produced and most often triangular. Nymphs lack gills and the dorsal fringe, or intercalary hairs, on cercal segments that often occurs in other perlodines.

DISTRIBUTION—Global: Holarctic- Regional: AOB, IDB, POB*— Aimag: AR, BO, BR*, BU, DA*, DO*, GA, KhD, KhE*, KhG, OV, SE, TO, UB, UV, ZA.

DISCUSSION: Full descriptions, illustrations, and an identification key to adults can be found in Zwick and

Surenkholoo (2005). Nymphs of all species in the eastern Palearctic have been described by Teslenko and Zhiltzova (2006), with an accompanying species-level identification key, primarily using coloration patterns.