Anisonema glaciale Larsen and Patterson, 1990. The cell body is oval or slightly ovate, 26-28 microns long, 13-14 microns wide. The cell surface has 12-15 delicate furrows. The posterior flagellum lies in a distinct gutter on the central side. Refractile bodies cluster around the base and one or both walls of the reservoir. Nucleus central. The moves forward with a rapid sleek gliding, the anterior flagellum sweeping from side to side, but may occasionally come to a complete halt for the few seconds, usually executing a reversal following the arrest.
