Fig. 1: The four groups of protozoans. Amoeboid, for example Amoeba: an irregular cell that moves by pseudopodia, which are false feet. Flagellated, for example Trypanosoma: a long thin cell with a flagellum. Ciliated, for example Paramecium: a slipper-shaped cell covered with cilia, with a gullet. Sporozoan, for example Plasmodium: a cell inside a red blood cell, and spore-like cells outside, which are the infectious stage.