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A rhizopod. common in fresh water, capable of undergoing many changes of form at will. See Rhizopoda.

A rhizopod. common in fresh water, capable of undergoing many changes of form at will. See Rhizopoda.

A genus of ameboid protozoa. Characteristics include a vesicular nucleus and the formation of several lodopodia, one of which is dominant at a given time. Reproduction occurs asexually by binary fission.

A genus of unicellular protozoan organisms of microscopic size, existing in nature in large numbers and many living as parasites; some species are pathogenic for man.

A microscopic organism of the simplest structure, being a mere mass of protoplasm, which absorbs its food at every point all over its body by means of processes, which arc locomotive also, protruded therefrom at will, so that it is constantly changing its shape.

A protozoon in which the shape is subject to constant alterations due to the formation and retraction of pseudopodia.