Ciliates are protozoa which have tiny hairs, cilia, which they can use to swim or feed. Some ciliates live on other organisms.
Ciliates on a copepod, Wageningen, NL Ciliates on a copepod, Wageningen, NL Ciliates on a copepod, Waddenzee, NL A tintinnid ciliate, Oosterschelde, NL A freshwater ciliate, Wageningen, NL