Stentor

"Stentor" is a protozoan, a ciliate, (phylum ciliaphora) to be precise. Stentor is the worlds largest single-celled organism. It can reach a length of up to 1/10 of an inch long. This really is a macroscopic cell. Stentor is so large that it eats just about everything else in the microscopic world. Stentor is commonly found in fresh water (like pond water) and you dont need a microscope to find it.