Korotnevella discophora Smirnov, 1999

Diagnosis: Irregularly triangular or elongate in locomotion, usually with several short dactylopodia, but sometimes with 1-2 very long, thin, tapering hyaline pseudopodia. Bulbous uroid may be present. Average length of the locomotive form, 23 μm (16—34 μm); breadth, 9 μm (6—14 μm); L/B 2—2.5. Floating form irregular, with 1—4 very long, thin, tapering pseudopodia. One vesicular nucleus, 1—2 μm in diameter, with compact central endosome and patches of dense material throughout the caryoplasm. Cyst unknown. Cell covered with disk-shaped scales; each scale has conical projection in the middle, resembling a specific sort of hat. Diameter of the scales about 350 nm, and height of central projection, about 80 nm.

Ecology: Bacteriophagous, freshwater, bottom sediments.

Geographical distribution: North-Western Russia.

Differential diagnosis: The present species is smaller than both other known freshwater species of Korotnevella and has a peculiar floating form, which does not resemble those of K. bulla and K. stella. It can well be distinguished from any known species with the use of EM, due to its peculiar scales.