These are single-celled organisms that use long, whip-like structures called flagella for movement. Flagella are essentially long, thin extensions of the cell membrane that rotate or undulate to propel the organism through its environment.

Here are some examples of flagellates:

* Euglena: A common freshwater flagellate that uses its flagellum for both movement and to capture food.

* Trypanosoma: A parasitic flagellate that causes sleeping sickness.

* Chlamydomonas: A green algae that uses its flagella to move through water.

Let me know if you have any other questions about flagellates or other single-celled organisms!