Genus: Elongate reniform (kidney-shaped); typically one postoral ciliary row; cytostome small, triangular, 1/4 from anterior end toward right side; macronucleus rounded; a micronucleus; a contractile vacuole (Kudo, 1966). Species:

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