Vannella langae (Sawyer, 1975)
Diagnosis: In locomotion, broadly triangular to ovoid with a slightly convex posterior margin. Frontal hyaloplasm from 1/3 to 1/2 of the total body area. Length of the locomotive form 7-12 µm (average 9 µm), breadth 5-10 µm (average 8 µm). Single vesicular nucleus about 2.5 µm in diameter, nucleolus 1.5-2 um in diameter. Floating form without radial pseudopodia, rod- or peg-shaped with one end slightly wider than the other. Rate of locomotion 15-20 µm/min. Ultrastructure unknown.
Ecology: described from marine waters; I found my specimens in freshwater, the Naardermeer.