Сколько видов бактерий известно по данным на 2019 год?
The number of named species of bacteria and archaea (approximately 13,000) is surprisingly small considering their early evolution, genetic diversity and residence in all ecosystems. The reason for this is the differences in species concepts between the "bacteria" and macro-organisms, the difficulties in growing/characterising in pure culture (a prerequisite to naming new species, "vide supra") and extensive horizontal gene transfer blurring the distinction of species.
13,000