Isoperla ornata Zhiltzova 1988

Isoperla ornata Zhiltzova, 1988 Figs. 71–80 Material examined. Russia, Far East, Primorsky Krai: 4♀, Komissarovka River, Khanka Lake basin, near Dvoryanka village, 23– 25.06.1994, coll. Bulavsky; 1♀, Barabashevka River, light trap, 06.07.2021, coll. E. Gorovaya; 4♂ 4♀, Komissarovka River, Komissarovo village, 28– 29.05.1998, coll. V. Teslenko; 1♂ 1♀, Tigrovaya River, opposite Khmelnitskie Shcheki, Partizanskaya R. basin, 11 06.1998, coll. V. Teslenko; 1♂ 1♀, Razdolnaya River near Fadeyevka village, 31.05.1998, coll. T. Vshivkova; 1♂, 1♀, Razdolnaya River, near the border with China, coll. T. Vshivkova; 4♂ 6♀, Shkotovka River, 25– 29.05.2015, reared, V. Teslenko. Egg. The egg of I. ornata is described here for the first time. Egg pear-shaped, posterior ⅔ triangular in cross-section, anterior ⅓ square, with distinct cross-shaped ridges (Figs. 71–72, 78–79); anterior pole square, slightly concave (Fig. 78). Length 263‒269 µm, width 181‒192 µm (n=5), chorion thickness 3.1 µm. Collar well developed, elevated with irregular and raised longitudinal ridges; rim flanged, serrated, or wavy; collar base offset with pits (Figs. 74–75). Anchor mushroom-shaped, with small globular bodies concentrated into groups of 2–5 and located mainly in a peripheral area along the anchor edge, top deeply embedded and covered with single globular bodies; anchor covers the collar completely (Fig. 73). Hexagonal FCI’s ridges slightly raised and thickened, floors flat with numerous (about 16) punctations (Fig. 80); eclosion line absent. Micropyles small and weakly visible, arranged singularly on follicle cell ridges near the anterior ⅓ of the egg (Fig. 77). Orifices set in small, oval, cup-shaped depressions; sperm guides poorly visible (Figs. 71–72, 77). Distribution. East Asian species with limited distribution in the south of the Russian Far East, including the Jewish Autonomous Region, Khabarovsk Krai, and Primorsky Krai.