Family: Small, less than 50 μm; oblong to ovate; ridges faint or absent.
Genus: Body fan-shaped in locomotion; Anterior, clear fan lacks bosses (Illustrated Guide, 1985).

Vannella sp. 18 clips Japan, 1998

Vannella sp. 4 clips 28 x 76 μm L/W=0.37 Japan, 1998

V. simplex 6 clips 20-28 x 64-76 μm L/W=0.34 Fujimi Saitama, 2000