L o c a l i t y. Lake Berizka in Kyiv (table 1).

D e s c r i p t i o n. Cell diameter 76.7 (1), diameter of adhesive disc 61.8 (1). Denticle number 21 (1). Width of border membrane 5.4 (1), diameter of denticle ring 53.4 (1), number of radial pins per denticle 5 (1). Central zone of the denticle ring is clear and evenly impregnated by silver. Blade sickle-shaped and broad, filling most of space between y-axis; Tangent point sharp, with distal margin slightly higher or at same level as tangent point. Distal surface with slight slope towards prominent blade apex that almost touches or extends only slightly beyond y-axis. Posterior blade margin forming deep curve, with deepest point lower than blade apex. Blade apophysis strongly developed and angular, coinciding with well developed posterior projection in previous denticle; length of blade 7.1 (1). Rays are broad and tapering downward, little recurved, but are flush with blades, length of rays is 8.3 (1). Central parts squat and well developed, extending slightly more than halfway towards y–1–axis.