Pelomyxa are giant amoebae, usually 500-800 μm but occasionally up to 5 mm in length. One notable species's P. palustris; other described species may be synonyms, or have been moved to the unrelated genus Chaos. They're found in mud at the bottom of freshwater streams. Pelomyxa have anywhere from two to several hundred nuclei. A moving cell's cylindrical in shape, with a single hemispherical pseudopod at the front and a semipermanent projection called a uroid at the back, which's covered i… (More on Pelomyxa)