On the basis of locomotory orgenelles, the phylum protozoa is divided into 4 classes.
1. Class – Flagellata or Mastigophora
• Locomotion is by flagella
• Examples : Euglena, Noctiluca, Leishmania, Trichomonas, Trypnosoma etc.
2. Class – Sarcodina or Rhizopoda
• Locomotion is by pseudopodia.
• Examples – Amoeba, Entamoeba, Pelomyxa etc.
3. Class – Ciliata
• Locomotion is by cilia.
• Examples – Paramecium, Vorticella, Didineum, Balantidium, Opalina. Nyctotherus, Spirostomumetc.
4. Class – Sporozoa
• Locomotary orgenelles are absent.
• They are parasitic Examples – Plasmodium, Monocystes, Nosema etc.