Genus: Ventral side with a hyaline border, reaching posterior end and bearing trichocysts; dorsal side with either similar trichocyst-border or with trichocyst-warts (Kudo, 1966). Species: a very common species; elongate; 160 μm long; with a neck region and rounded tail; highly contractile; two ovoid macronuclei; a single contractile vacuole (Carey, 1992).

50 μm 100 μm 150 μm; x 400