Amoeba (plural = amoebae) is a well known genus of unicellular organism, a protist. One of its most common species, the Amoeba Proteus, is about 0.2 to 0.3 mm large. The amoeba was first discovered by August Von Rosenhof in 1757. It is a genus of protozoa that moves with false feet, called pseudopodia.
Amoebae are often found within freshwater, typically on vegetation in decay in still or slow moving water, or in the benthic zone of some lakes. However, they are common organisms of study because it is easy to keep them in a laboratory. They are used to study protozoa and to demonstrate cell structure and function.