Bacillus subtilis | Bacillus | Bacillus thuringiensis | Bacillus anthracis | bacillus thuringiensis | Bacillus safensis | Bacillus pumilus |
Phylogenetically, based on 16S rRNA, B. megaterium is strongly linked with B. flexus, the latter distinguished from B. megaterium a century ago, but only recently confirmed as a different species.