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Bacterial taxonomy is the classification of strains within the domain Bacteria into hierarchies of similarity. This classification is similar to that of plants , mammals , and other taxonomies. However, biologists specializing in different areas have developed differing taxonomic conventions over time.
The three-domain system adds a level of classification (the domains) "above" the kingdoms present in the previously used five- or six-kingdom systems.This classification system recognizes the fundamental divide between the two prokaryotic groups, insofar as Archaea appear to be more closely related to eukaryotes than they are to other prokaryotes – bacteria-like organisms with no cell nucleus.
This article lists the orders of the Bacteria.The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) [1] and National Center for Biotechnology Information (NCBI) [2] and the phylogeny is based on 16S rRNA-based LTP release 132 by The All-Species Living Tree Project.
Carl Linnaeus made the classification "domain" popular in the famous taxonomy system he created in the middle of the eighteenth century. This system was further improved by the studies of Charles Darwin later on but could not classify bacteria easily, as they have very few observable features to compare to the other domains.
Class Order Family Synonyms "Deinonema" Ludwig W et al. 1990 "Ca. Ferristratum" McAllister et al. 2021 "Guhaiyingella" Haiying 1995 "Magnoovum" Orpin 1976 Eadie's oval "Nanobacterium" Ciftcioglu et al. 1997 "Nonospora" Fokin et al. 1987 "Ca. Ovibacter" corrig. Fenchel & Thar 2004 "Parakaryon" Yamaguchi et al. 2012 Myojin parakaryote
A new study suggests that the bacteria living in the mouth may influence cognitive function, and some harmful bacteria may contribute to the development of dementia and Alzheimer's disease.
Following present classification, there are a little less than 9,300 known species of prokaryotes, which includes bacteria and archaea; [189] but attempts to estimate the true number of bacterial diversity have ranged from 10 7 to 10 9 total species—and even these diverse estimates may be off by many orders of magnitude.
Bacteria display a large diversity of cell morphologies and arrangements. Bacterial cellular morphologies are the shapes that are characteristic of various types of bacteria and often key to their identification. Their direct examination under a light microscope enables the classification of these bacteria (and archaea).