Gram: Morphology: Arrangement: The metric unit micrometer (1/1,000,000 or 10 -6 of a meter) is used to measure bacterial size. The influence of variable culture conditions on the size and wet density of spores of Bacillus cereus and Bacillus megaterium were examined in this work. Pleomorphism, showing as cells and filaments with swollen regions, and entirely swollen cells, may be observed in cultures grown in suboptimal condi- Cocci (or coccus for a single cell) are round cells, sometimes slightly flattened when they are adjacent to one another. Bacillus megaterium - is the rods in chain. The spiral shape can appear in several forms: vibrio, spirillum, and spirochete. A few species, such as Bacillus megaterium, require no organic growth factors; others may require amino acids, B-vitamins, or both. So Streptobacilli.  With a cell length of up to 4 Î¼m and a diameter of 1.5 Î¼m, B. megaterium belongs to one of the largest known bacteria. ; Bacilli (or bacillus for a single cell) are rod-shaped bacteria. row limits. Bacillus megaterium, a Gram-positive, aerobic, spore-forming, rod-shaped bacterium, has been found in widely diverse habitats and has been widely used as a source of recombinant protein in the industry. ; Spirilla (or spirillum for a single cell) are curved bacteria which can range from a gently curved shape to a corkscrew-like spiral. Bacillus (Latin "stick") is a genus of Gram-positive, rod-shaped bacteria, a member of the phylum Firmicutes, with 266 named species.The term is also used to describe the shape (rod) of certain bacteria; and the plural Bacilli is the name of the class of bacteria to which this genus belongs. Shape of Bacterial Cell. Arrangement - you are correct. For example, cells of Bacillus pumilus are typically 0.6â0.7 by 2.0â3.0 Î¼m, while those of Bacillus megaterium are usually 1.2â1.5 by 2.0â5.0 Î¼m. The bacillus shape can appear as a single bacillus, a streptobacillus, or a coccobacillus. So Streptobacilli. Bacillus megaterium is a cytokinin promoting bacterium used to promote plant root overgrowth.The possible applications of Bacillus megaterium is being examined in the deserts of Egypt for the promotion of desert agriculture by Köberl and others. Single, Diplococci, Strep or Staph Morphology and Shape - same meaning. cocci, bacilli (rod) or spiral. The largest known Bacillus species is Bacillus megaterium which is about 1.5 µm by 4 µm long. Genus and Species: Bacillus megaterium Domain: Prokaryote Optimal Growth Medium: Nutrient Agar Optimal Growth Temperature: 30° C Package: Tube Biosafety Level: 1 Gram Stain: Gram-Positive Shape: Bacillus (rod-shaped) It is a gram-positive, rod shaped, spore forming bacteria. Bacillus megaterium.Bacillus megaterium is a naturally occurring soil bacterium, originally named because of its large size in relation to E. coli.This bacterium produces a number of useful enzymes, such as, amylases and proteases which have industrial uses. The majority are mesophiles, with temperature optima between 30 and 45 degrees, but some are thermophiles with optima as high as 65 degrees. Many spirilla are rigid and capable of movement. Among Bacillus species, some are harmful to humans, plants or other organisms such as Bacillus cereus which can cause spoilage in canned foods, food poisoning and Bacillus anthracis cause anthrax; Bacillus typhi causes typhoid disease. Bacillus megaterium - is the rods in chain.