Bacillus megaterium: this is a gram positive, rod-shaped bacteria. it is able to form endospores and is aerobic. this bacteria is found most often in soil. the name of the bacteria is related to its size (about 100 times larger than e. it has a cell length cell length of up to 4μm and a diameter of 1.5μm. in the 1960’s, this microorganism was used extensively for studying various areas of study such as biochemistry and bacteriophages. it is present everywhere in the environment and can be found in foods in addition to soil.