Isoperla kozlovi Zhiltzova, 1972

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 47-48

Isoperla kozlovi Zhiltzova, 1972

SYNONYMY

Isoperla kozlovi Zhiltzova, 1972

TYPE LOCALITY: Mongolia: Khentii .

DIAGNOSIS: Head of adult is infuscate on the anterior half, with a pale oval spot in the ocellar region bordered by a black, U-shaped line which connects all the ocelli ( Fig. 326). The pronotum has a well-delimited pale stripe, otherwise the rest of the disc is dark with darker rugosities. The mesoscutum has anterior golden-yellow markings ( Fig. 326) similar to I. asiatica ( Fig. 316), I. mongolica ( Fig. 336), and K. nigricauda ( Fig. 350). The male paraprocts are lightly sclerotized, sharp and extend on to tergum 10. The aedeagus has large paired sclerites, which are apparent through the body wall of sternum 10 as if the segment itself is pigmented ( Fig. 328). The apices of the sclerites are directed medially towards one another but do not touch. The female subgenital plate is triangular with a rounded apex that is sometimes shallowly notched ( Fig. 329). Overall, the plate resembles that of I. obscura (Zetterstedt, 1840) ( Fig. 343) and Kaszabia nigricauda ( Fig. 353), but is not as long and only extends slightly onto segment 9. Nymph head coloration ( Fig. 305) is dark from the epicranial arm to the M-line with no dark markings posterior to the lateral ocelli or on the labrum.

DISTRIBUTION—Global: East Palearctic— Regional: AOB, IDB*, POB*— Aimag: AR, BO*, BU, DO*, KhE*, KhG, SE, TO.

DISCUSSION: This species was originally described from Mongolia by Zhiltzova (1972) in her first contribution to the Insects of Mongolia series. When considering only our study, this species appears to be restricted to the Selenge River basin ( Fig. 330), but is predicted to occur in the eastern Khentii region which is where the type specimen was collected .