http://en.wikipedia.org/wiki/Bacteria
However, even using these improved methods, the total number of bacterial species is not known and cannot even be estimated with any certainty. Following present classification, there are a little less than 9,300 known species of prokaryotes, which includes bacteria and archaea;but attempts to estimate the true number of bacterial diversity have ranged from 100 million to 10 billion total species – and even these diverse estimates may be off by many orders of magnitude.
However, even using these improved methods, the total number of bacterial species is not known and cannot even be estimated with any certainty. Following present classification, there are a little less than 9,300 known species of prokaryotes, which includes bacteria and archaea;but attempts to estimate the true number of bacterial diversity have ranged from 100 million to 10 billion total species – and even these diverse estimates may be off by many orders of magnitude.
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