Prokaryotic diversity increases every year with each new described species. Since the first discoveries of microorganisms, researchers’endeavours are dedicated to the systematisation of all known living organisms in a consistent taxonomy. Originally based on morphology, in recent years modern taxonomy develops thanks to the implemenation of new discoveries in the fields of biochemistry and genetics. In the last thirty years, ribotyping was the leading technique used to classify microorganisms. Due to problems with the comparison of certain species, novel methods based on the analysis of proteins have been applied. In-depth analysis of
1. Introduction. 2. Principles regarding the introduction of taxonomical changes. 3. Justification of taxonomical changes. 4. Modifications in the order