Ovoid to cylindrical; ciliation uniform; oral basket made up of double trichites which end up
deep in ectoplasm; contractile vacuole terminal (Kudo, 1966).
Brosse as 3 longitudinal files (Illustrated Guide, 1985).
Body ellipsoidal, ovoid or cylindrical in shape; cytostome apical, circular;
cytopharynx equipped with well-developed double nematodesmata; somatic ciliation uniform,
kinetosomes paired; macronucleus ovoid, reniform or ellongate; as many species descriptions
are insufficient, many are indistinguishable (Carey, 1992).