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Description of AmoebaLocomotive cells, often 220 to 760 µm in length, although A. diminutiva Bovee, 1972 is only 15 to 20 µm. Usually polypodial with one dominant cylindrical pseudopodium, often with ectoplasmic ridges. Resting, or well fed, cells irregularly rounded. Floating form with long, radiating pseudopodia. Cytoplasm granular in appearance often with truncated bipyramidal crystals. Posterior uroid morulate when present. Single nucleus, discoid or ovoidal, sometimes with peripheral granules. Nucleolar material often scattered. At the ultrastructural level, surface coat of A. proteus has filaments rising 230 nm above the plasma membrane whereas coat of A. lenigradensis amorphous and without filaments. Freshwater. The genus is best known for the species A. proteus which is a popular teaching tool and familiar to most students of biology.