Genus: Body long to ovoid; cilia on 1 surface (Illustrated Guide, 1985). Long, thin, cylindrical in shape (vermiform); flattened laterally; contractile; anterior is truncated with cytostome lying along the apical edge; several contractile vacuoles along the dorsal edge (Carey, 1992). Species: Cell body vermiform, highly contractile, up to 650 μm long, posterior pointed; macronucleus moniliform; contractile vacuole lying against dorsal ridge along the entire length of the body (Kahl, 1935).

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