Acanthocystis crescenta Zlatogursky, 2010
Diagnosis: Cell body ca.7 µm in diameter; including scales -about 12 µm. Axopodia ca. 33 µm long.Plate scales are oviform. Length of plates cales is 1.8-1.9 µm, width 1.0-1.1 µm. Distal ends of radial scales look like a crescent with a short tooth in a middle. Length of radial scales is 2.8-4.3 µm, thickness 0.1-0.2 µm. Cells actively move on the bottom of the culture dish or float in the culture medium.
Differential diagnosis: Acanthocystis crescenta has crescent-shaped tips of radial scales. There is a tooth in the middle of each crescent-like structure. The only species possessing a similar type of scales is A. astrakhanensis, but its radial scales are much more solid, without central tooth.
Type location: Symniakhovskoelake,Valamoisland, North-Western Russia.