Genus: With a vase-like chitinous lorica to which stalked or stalkless organism is attached; fresh or salt water; numerous species (Kudo, 1966). Transparent; ovoid; collar indistinct; in lorica (How to know the protozoa, 1979). Solitary or colonial; with firm lorica (theca) as a cup or tube; protoplast with 1 anterior flagellum encircled laterally by well-developed collar; contractile vacuoles posterior in fresh water species (Illustrated Guide, 1985). Species:

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