Pelomyxa is a genus of giant flagellar amoeboid protists, usually 500-800 μm but occasionally up to 5 mm in length, found in anaerobic or microaerobic bottom sediments of stagnant freshwater ponds or slow-moving streams. The genus was created by R. Greeff, in 1874, with Pelomyxa palustris as its type species. In the decades following the erection...