Family: Apex somewhat to much fan-shaped; oral region along apex, may extend ventrally
(Illustrated Guide, 1985). Cytostome slit-like, situated apically on non-ciliated ridge of the body
Genus: Body flattened, crescentic (Illustrated Guide, 1985).
Species: Cell body 160 μm long when extended, 130 μm long when contracted (Kahl, 1930).