Genus: Body reniform; dorsoventrally flattened; right body edge convex, left concave; somatic groove originates on the dorsal surface, travels around the left side to the entrace of the vestibulum on the ventral surface (Carey, 1992). Oral cavity not tubular (Illustrated Guide, 1985). Species: Cell body 60 μm long (Kahl, 1930).

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640