An ameba is a common name for certain one-celled organisms belonging to the phylum Sarcodina of the kingdom Protista . Pelomyxa are heterotrophs, meaning they rely on photosynthetic organisms either directly or indirectly. They use this extension in locomotion and feeding. The two methods discussed are the tail contraction model where force is generated in the tail region and the frontal contractile method where force at the tip of the organism pulls forward rather then pushing. It is likely that you may have looked at an ameba under a microscope before but due to the intense pressure of the cover slip, the ameba was flattened and therefore appears as a blob.
Few animals escape invasion by some type of ameba.
Some are harmless, but others are pathogenic and cause serious diseases.