In simple terms, there are 4 categories of protists in basic biology characterized by their type of locomotion.
Locomotion by pseudopods or "false feet" is characteristic of ameobas (i.e. Entamoeba histolytica). Locomotion by papillary projections from the cell membrane called "cilia" is characteristic of Paramecium species. Locomotion by whip-like structures that propel the organism called "flagella" is characteristic of Euglena species.
Lastly, protists that do not have locomotive organelles are exemplified by Plasmodium species, the etiologic agent of malaria.
