Family: Right ventral kineties curve left; twist forward parallel to anterior suture. (Illustrated Guide, 1985).
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).