Genus: When extended, trumpet-shaped or cylindrical; highly contractile; some with mucilaginous lorica; conspicuous peristomal field frontal; contractile vacuole anterior-left; fresh water (Kudo, 1966).
Species: Body trumpet-shaped; macronucleus moniliform; 1-2 μm when extended; ck tractile vacuole anterior; pellicle dark, bluish-green color (How to know the protozoa, 1979).