[Classification of prokaryotic species: the problem, demands, and methods of solving].
In accordance with the current approaches to the description of species of procaryotic organisms, they should be based on the comprehensive study of morphological, cultural, physiological, biochemical, serological, structure, genetic, molecular-biological, ecological and pathogenic peculiarities of the strains which are described as new species with finding unique and rather stable signs in them for to differ one group of strains from the other one, another set of unique and stable signs being determined for the latter. Thus, a species is a collection of original strains with high level of mutual similarity of the properties, if compare them with another group of relative strains. The strains which have changed key characteristics cannot be identified as the components of the already described species as well as a species cannot be described as based on the investigation of only one strain. Phenotypical signs of the strains composing a species would be identical, and the homology of their genome DNA would not be less than 70%, difference of melting temperatures of these molecules would not exceed 5 degrees C, and identity of sequences of their 16S rRNA is about 96%. The paper deals in detail with all the above propositions with analysis of their state in the world science with classification of procaryotes and specifying methodical and other requirements to the description of these species.
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D010802:Phylogeny; D011387:Prokaryotic Cells / Q000145:classification* / Q000378:metabolism; D012336:RNA, Ribosomal, 16S / Q000032:analysis*
D012336:RNA, Ribosomal, 16S