
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 the plates-scales is 1.8-1.9 µm, width 1.0-1.1 µm. Distal ends of the radial spine-scales look like a crescent with a short tooth in a middle. Length of the spine-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 spine-scales with crescent-shaped tips. There is a tooth in the middle of each crescent-like structure. The only species possessing a similar type of spine-scales is A. astrakhanensis, but its spine-scales are much more solid, without central tooth.
Type location. Freshwater. Type locality: Symniakhovskoelake, Valamoisland, North-Western Russia.