Ciliate protozoa. Light micrograph of a mixed population of freshwater ciliate protozoa and algae. The algae are the green filaments crossing the field. Several different types of ciliate are seen, including Paramecium bursaria (centre left), Stylonychia (upper left), Paramecium caudatum (centre right) and Urostyla (upper right). At centre, an unidentified ciliate is dividing asexually to form two daughter cells. Ciliates are protozoa that possess cilia, short hairs that are beaten for locomotion and to waft food particles (mainly bacteria) into the ciliate's mouth. Magnification: x180 when printed 10cm wide.