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Bacterial taxonomy
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The hierarchy of biological classification's eight major taxonomic ranks. Intermediate minor rankings are not shown.
Bacterial taxonomy is the taxonomy, i.e. the rank-based classification, of bacteria.
In the scientific classification established by Carl Linnaeus ,[1] each species has to be assigned to a genus (binary nomenclature), which in turn is a lower level of a hierarchy of ranks (family, suborder, order, subclass, class, division/phyla, kingdom and domain). In the currently accepted classification of life, there are three domains (Eukaryotes, Bacteria and Archaea),[2] which, in terms of taxonomy, despite following the same principles have several different conventions between them and between their subdivisions as are studied by different disciplines (botany, zoology, mycology and microbiology), for example in zoology there are type specimens, whereas in microbiology there are type strains.
Contents
[hide]
1 Diversity
2 History
2.1 First descriptions
2.2 Early formal classifications
2.3 Informal groups based on Gram staining
2.4 Molecular era
2.4.1 "Archaic bacteria" and Woese's reclassification
2.4.2 Subdivisions
2.4.3 Opposition
3 Authorities
3.1 Nomenclature authority
3.2 Classification authorities
3.3 Description of new species
3.4 Distribution
4 Analyses
5 New species
6 Candidatus
7 Species concept
8 Pathology vs. phylogeny
8.1 Escherichia coli: overly large and polyphyletic
8.2 Bacillus cereus group: close and polyphyletic
8.3 Yersinia pestis: extremely recent species
8.4 Nested genera in Pseudomonas
8.5 Nested genera in Bacillus
8.6 Agrobacterium: resistance to name change
9 Nomenclature
9.1 Rules for higher taxa
9.2 Phyla endings
9.3 Names after people
9.4 Names after places
10 Vernacular names
11 Terminology
12 See also
13 References
Diversity[edit]
Main article: Bacteria
Prokaryotes share many common features, such as lack of nuclear membrane, unicellularity, division by binary-fission and generally small size. The various species differ amongst each other based on several characteristics, allowing their identification and classification. Examples include:
Phylogeny: All bacteria stem from a common ancestor and diversified since, and consequently possess different levels of evolutionary relatedness (see Bacterial phyla and Timeline of evolution)
Metabolism: Different bacteria may have different metabolic abilities (see Microbial metabolism)
Environment: Different bacteria thrive in different environments, such as high/low temperature and salt (see Extremophiles)
Morphology: There are many structural differences between bacteria, such as cell shape, Gram stain (number of lipid bilayers) or bilayer composition (see Bacterial cellular morphologies, Bacterial cell structure)
Pathogenicity: Some bacteria are pathogenic to plants or animals (see Pathogenic bacteria)
History[edit]
First descriptions[edit]
Bacteria were first observed by Antonie van Leeuwenhoek in 1676, using a single-lens microscope of his own design.[3] He called them "animalcules" and published his observations in a series of letters to the Royal Society.[4][5][6]
Early described genera of bacteria include Vibrio and Monas, by O. F. Müller (1773, 1786), then classified as Infusoria (however, many species before included in those genera are regarded today as protists); Polyangium, by H. F. Link (1809), the first bacterium still recognized today; Serratia, by Bizio (1823); and Spirillum, Spirochaeta and Bacterium, by Ehrenberg (1838).[7][8]
The term Bacterium, introduced as a genus by Ehrenberg in 1838,[9] became a catch-all for rod-shaped cells.[7]
Early formal classifications[edit]
Main article: Monera
Tree of Life in Generelle Morphologie der Organismen (1866)[10]
Bacteria were first classified as plants constituting the class Schizomycetes, which along with the Schizophyceae (blue green algae/Cyanobacteria) formed the phylum Schizophyta.[11]
Haeckel in 1866 placed the group in the phylum Moneres (from μονήρης: simple) in the kingdom Protista and defines them as completely structureless and homogeneous organisms, consisting only of a piece of plasma.[10] He subdivided the phylum into two groups:[10]
die Gymnomoneren (no envelope)
Protogenes—such as Protogenes primordialis, now classed as a eukaryote and not a bacterium
Protamaeba—now classed as a eukaryote and not a bacterium
Vibrio—a genus of comma shaped bacteria first described in 1854[12])
Bacterium—a genus of rod shaped bacteria first described in 1828, that later gave its name to the members of the Monera, formerly referred to as "a moneron" (plural "monera") in English and "eine Moneren"(fem. plural "Moneres") in German
Bacillus—a genus of spore-forming rod shaped bacteria first described in 1835[13]
Spirochaeta—thin spiral shaped bacteria first described in 1835 [14]
Spirillum—spiral shaped bacteria first described in 1832[15]
etc.
die Lepomoneren (with envelope)
Protomonas—now classed as a eukaryote and not a bacterium. The name was reused in 1984 for an unrelated genus of Bacteria[16]
Vampyrella—now classed as a eukaryote and not a bacterium
The classification of Cohn (1872) was influential in the nineteenth century, and recognized six genera: Micrococcus, Bacterium, Bacillus, Vibrio, Spirillum, and Spirochaeta.[7]
The group was later reclassified as the Prokaryotes by Chatton.[17]
The classification of Cyanobacteria (colloquially "blue green algae") has been fought between being algae or bacteria (for example, Haeckel classified Nostoc in the phylum Archephyta of Algae[10]).
in 1905 Erwin F. Smith accepted 33 valid different names of bacterial genera and over 150 invalid names,[18] and in 1913 Vuillemin[19] in a study concluded that all species of the Bacteria should fall into the genera Planococcus, Streptococcus, Klebsiella, Merista, Planomerista, Neisseria, Sarcina, Planosarcina, Metabacterium, Clostridium, Serratia, Bacterium and Spirillum.
Ferdinand Cohn [20] recognized 4 tribes: Spherobacteria, Microbacteria, Desmobacteria, and Spirobacteria. Stanier and van Neil [21] recognized the Kingdom Monera with 2 phyla, Myxophyta and Schizomycetae, the latter comprising classes Eubacteriae (3 orders), Myxobacteriae (1 order), and Spirochetae (1 order). Bisset [22] distinguished 1 class and 4 orders: Eubacteriales, Actinomycetales, Streptomycetales, and Flexibacteriales. Migula,[23] which was the most widely accepted system of its time and included all then-known species but was based only on morphology, contained the 3 basic groups, Coccaceae, Bacillaceae, and Spirillaceae but also Trichobacterinae for filamentous bacteria; Orla-Jensen [24] established 2 orders: Cephalotrichinae (7 families) and Peritrichinae (presumably with only 1 family). Bergey et al [25] presented a classification which generally followed the 1920 Final Report of the SAB(Society of American Bacteriologists) Committee ( Winslow et al), which divided Class Schizomycetes into 4 orders: Myxobacteriales, Thiobacteriales, Chlamydobacteriales, and Eubacteriales, with a 5th group being 4 genera considered intermediate between bacteria and protozoans: Spirocheta, Cristospira, Saprospira, and Treponema.
However, different authors often reclassified the genera due to the lack of visible traits to go by, resulting in a poor state which was summarised in 1915 by Robert Earle Buchanan [26] By then, the whole group received different ranks and names by different authors namely
Schizomycetes (Naegeli 1857[11])
Bacteriaceae (Cohn 1872,[27])
Bacteria (Cohn 1872b,[28])
Schizomycetaceae (DeToni and Trevisan 1889,[29])
Furthermore the families into which the class was subdivided, changed from author to author and for some such as Zipf the names where in German and not in Latin [30] The first edition of the Bacteriological Code in 1947 sorted several problems out.[31]
A.R. Prévot's system [32][33]) had 4 subphyla and 8 classes as follows:
Eubacteriales (classes Asporulales and Sporulales) Mycobacteriales (classes Actinomycetales, Myxobacteriales, and Azotobacteriales) Algobacteriales (classes Siderobacteriales and Thiobacteriales) Protozoobacteriales (class Spirochetales)
Linnaeus
1735[34]
Haeckel
1866[35]
Chatton
1925[36]
Copeland
1938[37]
Whittaker
1969[38]
Woese et al.
1990[39]
Cavalier-Smith
1998[40]
2 kingdoms 3 kingdoms 2 empires 4 kingdoms 5 kingdoms 3 domains 6 kingdoms
(not treated) Protista Prokaryota Monera Monera Bacteria Bacteria
Archaea
Eukaryota Protoctista Protista Eucarya Protozoa
Chromista
Vegetabilia Plantae Plantae Plantae Plantae
Fungi Fungi
Animalia Animalia Animalia Animalia Animalia
Main article: Kingdom (biology) § Summary
Informal groups based on Gram staining[edit]
Despite there being little agreement on the major subgroups of the Bacteria, Gram staining results were most commonly used as a classification tool. Consequently, until the advent of molecular phylogeny, the Kingdom Prokaryotae was divided into four divisions,[41] A classification scheme still formally followed by Bergey's manual of systematic bacteriology for tome order[42]
Gracilicutes (gram-negative)
Photobacteria (photosynthetic): class Oxyphotobacteriae (water as electron donor, includes the order Cyanobacteriales=blue-green algae, now phylum Cyanobacteria) and class Anoxyphotobacteriae (anaerobic phototrophs, orders: Rhodospirillales and Chlorobiales
Scotobacteria (non-photosynthetic, now the Proteobacteria and other gram-negative nonphotosynthetic phyla)
Firmacutes [sic] (gram-positive, subsequently corrected to Firmicutes[43])
several orders such as Bacillales and Actinomycetales (now in the phylum Actinobacteria)
Mollicutes (gram variable, e.g. Mycoplasma)
Mendocutes (uneven gram stain, "methanogenic bacteria", now known as the Archaea)
Molecular era[edit]
"Archaic bacteria" and Woese's reclassification[edit]
Main article: Archaea
Phylogenetic tree showing the relationship between the archaea and other forms of life. Eukaryotes are colored red, archaea green and bacteria blue. Adapted from Ciccarelli et al.[44]
Woese argued that the bacteria, archaea, and eukaryotes represent separate lines of descent that diverged early on from an ancestral colony of organisms.[45][46] However, a few biologists argue that the Archaea and Eukaryota arose from a group of bacteria.[47] In any case, it is thought that viruses and archaea began relationships approximately two billion years ago, and that co-evolution may have been occurring between members of these groups.[48] It is possible that the last common ancestor of the bacteria and archaea was a thermophile, which raises the possibility that lower temperatures are "extreme environments" in archaeal terms, and organisms that live in cooler environments appeared only later.[49] Since the Archaea and Bacteria are no more related to each other than they are to eukaryotes, the term prokaryote's only surviving meaning is "not a eukaryote", limiting its value.[50]
With improved methodologies it became clear that the methanogenic bacteria were profoundly different and were (erroneously) believed to be relics of ancient bacteria[51] thus Carl Woese, regarded as the forerunner of the molecular phylogeny revolution, identified three primary lines of descent: the Archaebacteria, the Eubacteria, and the Urkaryotes, the latter now represented by the nucleocytoplasmic component of the Eukaryotes.[52] These lineages were formalised into the rank Domain (regio in Latin) which divided Life into 3 domains: the Eukaryota, the Archaea and the Bacteria.[2] This scheme is still followed today.
Subdivisions[edit]
Main article: Bacterial phyla
In 1987 Carl Woese divided the Eubacteria into 11 divisions based on 16S ribosomal RNA (SSU) sequences, which with several additions are still used today.[53][54]
Opposition[edit]
While the three domain system is widely accepted,[55] some authors have opposed it for various reasons.
One prominent scientist who opposes the three domain system is Thomas Cavalier-Smith, who proposed that the Archaea and the Eukaryotes (the Neomura) stem from Gram positive bacteria (Posibacteria), which in turn derive from gram negative bacteria (Negibacteria) based on several logical arguments,[56][57] which are highly controversial and generally disregarded by the molecular biology community (c.f. reviewers' comments on,[57] e.g. Eric Bapteste is "agnostic" regarding the conclusions) and are often not mentioned in reviews (e.g.[58]) due to the subjective nature of the assumptions made.[59]
However, despite there being a wealth of statistically supported studies towards the rooting of the tree of life between the Bacteria and the Neomura by means of a variety of methods,[60] including some that are impervious to accelerated evolution—which is claimed by Cavalier-Smith to be the source of the supposed fallacy in molecular methods[56]—there are a few studies which have drawn different conclusions, some of which place the root in the phylum Firmicutes with nested archaea.[61][62][63]
Radhey Gupta's molecular taxonomy, based on conserved signature sequences of proteins, includes a monophyletic Gram negative clade, a monophyletic Gram positive clade, and a polyphyletic Archeota derived from Gram positives.[64][65][66] Hori and Osawa's molecular analysis indicated a link between Metabacteria (=Archeota) and eukaryotes.[67] The only cladistic analyses for bacteria based on classical evidence largely corroborate Gupta's results (see comprehensive mega-taxonomy).
James Lake presented a 2 primary kingdom arrangement (Parkaryotae + eukaryotes and eocytes + Karyotae) and suggested a 5 primary kingdom scheme (Eukaryota, Eocyta, Methanobacteria, Halobacteria, and Eubacteria) based on ribosomal structure and a 4 primary kingdom scheme (Eukaryota, Eocyta, Methanobacteria, and Photocyta), bacteria being classified according to 3 major biochemical innovations: photosynthesis (Photocyta), methanogenesis (Methanobacteria), and sulfur respiration (Eocyta).[68][69][70] He has also discovered evidence that Gram-negative bacteria arose from a symbiosis between 2 Gram-positive bacteria.[71]
Authorities[edit]
See also: International Code of Nomenclature of Bacteria and LPSN
Classification is the grouping of organisms into progressively more inclusive groups based on phylogeny and phenotype, while nomenclature is the application of formal rules for naming organisms.[72]
Nomenclature authority[edit]
Main article: Bacteriological Code
Despite there being no official and complete classification of prokaryotes, the names (nomenclature) given to prokaryotes are regulated by the International Code of Nomenclature of Bacteria (Bacteriological Code), a book which contains general considerations, principles, rules, and various notes, and advises[73] in a similar fashion to the nomenclature codes of other groups.
Classification authorities[edit]
Main article: Bergey's Manual of Systematic Bacteriology
The taxa which have been correctly described are reviewed in Bergey's manual of Systematic Bacteriology, which aims to aid in the identification of species and is considered the highest authority.[42] An online version of the taxonomic outline of bacteria and archaea is available [1].
Main article: LPSN
LPSN is an online database which currently contains over two thousand accepted names with their references, etymologies and various notes.[74]
Description of new species[edit]
Main article: International Journal of Systematic and Evolutionary Microbiology
The International Journal of Systematic Bacteriology/International Journal of Systematic and Evolutionary Microbiology (IJSB/IJSEM) is a peer reviewed journal which acts as the official international forum for the publication of new prokaryotic taxa. If a species is published in a different peer review journal, the author can submit a request to IJSEM with the appropriate description, which if correct, the new species will be featured in the Validation List of IJSEM.
Distribution[edit]
Main article: Culture collection
Microbial culture collections are depositories of strains which aim to safeguard them and to distribute them. The main ones being:[72]
Collection Acronym
Name
Location
ATCC American Type Culture Collection Manassas, Virginia
NCTC National Collection of Type Cultures Public Health England, United Kingdom
BCCM Belgium Coordinated Collection of Microorganisms Ghent, Belgium
CIP Collection d'Institut Pasteur Paris, France
DSMZ Deutsche Sammlung von Mikroorganismen und Zellkulturen Braunschweig, Germany
JCM Japan Collection of Microorganisms Saitama, Japan
NCCB Netherlands Culture Collection of Bacteria Utrecht, Netherlands
NCIMB National Collection of industrial, Marine and food bacteria Aberdeen, Scotland
ICMP International Collection of Microorganisms from Plants Auckland, New Zealand
Analyses[edit]
This section needs expansion. You can help by adding to it. (May 2011)
Bacteria were at first classified based solely on their shape (vibrio, bacillus, coccus etc.), presence of endospores, gram stain, aerobic conditions and motility. This system changed with the study of metabolic phenotypes, where metabolic characteristics were used.[75] Recently, with the advent of molecular phylogeny, several genes are used to identify species, the most important of which is the 16S rRNA gene, followed by 23S, ITS region, gyrB and others to confirm a better resolution. The quickest way to identify to match an isolated strain to a species or genus today is done by amplifying it's 16S gene with universal primers and sequence the 1.4kb amplicon and submit it to a specialised web-based identification database, namely either Ribosomal Database Project[2], which align the sequence to other 16S sequences using infernal, a secondary structure bases global alignment,[76][77] or ARB SILVA, which aligns sequences via SINA (SILVA incremental aligner), which does a local alignment of a seed and extends it [3].[78]
Several identification methods exists:[72]
Phenotypic analyses
fatty acid analyses
Growth conditions (Agar plate, Biolog multiwell plates)
Genetic analyses
DNA-DNA hybridization
DNA profiling
Sequence
GC ratios
Phylogenetic analyses
16S-based phylogeny
phylogeny based on other genes
Multi-gene sequence analysis
Whole-genome sequence based analysis
New species[edit]
The minimal standards for describing a new species depend on which group the species belongs to. c.f.[79]
Candidatus[edit]
Main article: candidatus
Candidatus is a component of the taxonomic name for a bacterium that cannot be maintained in a Bacteriology Culture Collection. It is an interim taxonomic status for noncultivable organisms. e.g. "Candidatus Pelagibacter ubique"
Species concept[edit]
Main article: Species problem
Bacteria divide asexually and for the most part do not show regionalisms ("Everything is everywhere"), therefore the concept of species, which works best for animals, becomes entirely a matter of judgement.
The number of named species of bacteria and archaea (approximately 13,000)[80] 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.[81]
The most commonly accepted definition is the polyphasic species definition, which takes into account both phenotypic and genetic differences.[82] However, a quicker diagnostic ad hoc threshold to separate species is less than 70% DNA–DNA hybridisation,[83] which corresponds to less than 97% 16S DNA sequence identity.[84] It has been noted that if this were applied to animal classification, the order primates would be a single species.[85]
Pathology vs. phylogeny[edit]
Ideally, taxonomic classification should reflect the evolutionary history of the taxa, i.e. the phylogeny. Although some exceptions are present when the phenotype differs amongst the group, especially from a medical standpoint. Some examples of problematic classifications follow.
Escherichia coli: overly large and polyphyletic[edit]
Main article: Escherichia coli
In the Enterobacteriaceae family of the class Gammaproteobacteria, the species in the genus Shigella (S. dysenteriae, S. flexneri, S. boydii, S. sonnei) from an evolutionary point of view are strains of the species Escherichia coli (polyphyletic), but due to genetic differences cause different medical conditions in the case of the pathogenic strains.[86] Escherichia coli is a badly classified species as some strains share only 20% of their genome. Being so diverse it should be given a higher taxonomic ranking. However, due to the medical conditions associated with the species, it will not be changed to avoid confusion in medical context.
Bacillus cereus group: close and polyphyletic[edit]
Main article: Bacillus cereus
In a similar way, the Bacillus species (=phylum Firmicutes) belonging to the "B. cereus group" (B. anthracis, B. cereus, B . thuringiensis, B. mycoides, B. pseudomycoides, B. weihenstephanensis and B. medusa) have 99-100% similar 16S rRNA sequence (97% is a commonly cited adequate species cut-off) and are polyphyletic, but for medical reasons (anthrax etc.) remain separate.[87]
Yersinia pestis: extremely recent species[edit]
Main article: Yersinia pestis
Yersinia pestis is in effect a strain of Yersinia pseudotuberculosis, but with a pathogenicity island that confers a drastically different pathology (Black plague and tuberculosis-like symptoms respectively) which arose 15,000 to 20,000 years ago.[88]
Nested genera in Pseudomonas[edit]
Main article: Azotobacter
In the gammaproteobacterial order Pseudomonadales, the genus Azotobacter and the species Azomonas macrocytogenes are actually members of the genus Pseudomonas, but were misclassified due to nitrogen fixing capabilities and the large size of the genus Pseudomonas which renders classification problematic.[75][89][90] This will probably rectified in the close future.
Nested genera in Bacillus[edit]
Main article: Bacillus
Another example of a large genus with nested genera is the Bacillus genus, in which the genera Paenibacillus and Brevibacillus are nested clades.[91] There is insufficient genomic data at present to fully and effectively correct taxonomic errors in Bacillus.
Agrobacterium: resistance to name change[edit]
Main article: Agrobacterium
Based on molecular data it was shown that the genus Agrobacterium is nested in Rhizobium and the Agrobacterium species transferred to the Rhizobium genus (resulting in the following comp. nov.: Rhizobium radiobacter (formerly known as A. tumefaciens), R. rhizogenes, R. rubi, R. undicola and R. vitis)[92] Given the plant pathogenic nature of Agrobacterium species, it was proposed to maintain the genus Agrobacterium[93] and the latter was counter-argued[94]
Nomenclature[edit]
Main article: Binomial Nomenclature
See also: Latin grammar and Ancient Greek grammar
Taxonomic names are written in italics (or underlined when handwritten) with a majuscule first letter with the exception of epithets for species and subspecies. Despite it being common in zoology, tautonyms (e.g. Bison bison) are not acceptable and names of taxa used in zoology, botany or mycology cannot be reused for Bacteria (Botany and Zoology do share names).
Nomenclature is the set of rules and conventions which govern the names of taxa. The difference in nomenclature between the various kingdoms/domains is reviewed in.[95]
For Bacteria, valid names must have a Latin or Neolatin name and can only use basic latin letters (w and j inclusive, see History of the Latin alphabet for these), consequently hyphens, accents and other letters are not accepted and should be transliterated correctly (e.g. ß=ss).[96] Ancient Greek being written in the Greek alphabet, needs to be transliterated into the Latin alphabet.
When compound words are created, a connecting vowel is needed depending on the origin of the preceding word, regardless of the word that follows, unless the latter starts with a vowel in which case no connecting vowel is added. If the first compound is Latin then the connecting vowel is an -i-, whereas if the first compound is Greek, the connecting vowel is an -o-.[97]
For etymologies of names consult LPSN.
Rules for higher taxa[edit]
For a comparison with other nomenclature codes, see Taxonomic rank § Terminations of names.
For the Prokaryotes (Bacteria and Archaea) the rank kingdom is not used[98] (although some authors refer to phyla as kingdoms[72])
If a new or amended species is placed in new ranks, according to Rule 9 of the Bacteriologocal Code the name is formed by the addition of an appropriate suffix to the stem of the name of the type genus.[73] For subclass and class the recommendation from [99] is generally followed, resulting in a neutral plural, however a few names do not follow this and instead keep into account graeco-latin grammar (e.g. the female plurals Thermotogae, Aquificae and Chlamydiae, the male plurals Chloroflexi, Bacilli and Deinococci and the greek plurals Spirochaetes, Gemmatimonadetes and Chrysiogenetes).[100]
Rank
Suffix
Example
Genus Elusimicrobium
Subtribe (disused) -inae (Elusimicrobiinae)
Tribe (disused) -inae (Elusimicrobiieae)
Subfamily -oideae (Elusimicrobioideae)
Family -aceae Elusimicrobiaceae
Suborder -ineae (Elusimicrobineae)
Order -ales Elusimicrobiales
Subclass -idae (Elusimicrobidae)
Class -ia Elusimicrobia
Phylum see text Elusimicrobia
Phyla endings[edit]
See also: Bacterial phyla
Phyla are not covered by the Bacteriological code,[100] however, the scientific community generally follows the Ncbi and Lpsn taxonomy, where the name of the phylum is generally the plural of the type genus, with the exception of the Firmicutes, Cyanobacteria and Proteobacteria, whose names do not stem from a genus name. The higher taxa proposed by Cavalier-Smith[56] are generally disregarded by the molecular phylogeny community (e.g.[58]) (vide supra).
For the Archaea the suffix -archaeota is used.[101] For bacterial phyla it was proposed that the suffix -bacteria be used for phyla.[102]
Consequently for main phyla the name of the phyla is the same as the first described class:
Acidobacteria (from Acidobacterium)
Actinobacteria (from Actinomyces)
Caldisericia (from Caldisericum)
Elusimicrobia (from Elusimicrobium)
Fusobacteria (from Fusobacterium)
Thermodesulfobacteria (from Thermodesulfobacterium)
Thermotogae (from Thermotoga)
Aquificae (from Aquifex)
Chlamydiae (from Chlamydia)
Chloroflexi (from Chloroflexus)
Chrysiogenetes (from Chrysiogenes)
Gemmatimonadetes (from Gemmatimonas)
Deferribacteres (from Deferribacter)
Whereas for others where the -ia suffix for class is used regardless of grammar they differ:
phylum Bacteroidetes vs. class Bacteroidia from Bacteroides
phylum Chlorobi vs. class Chlorobia from Chlorobium
phylum Verrucomicrobia vs. class Verrucomicrobiae from Verrucomicrobium (anomalous class name)
phylum Dictyoglomi versus class Dictyoglomia from Dictyoglomus
phylum Fibrobacteres versus class Fibrobacteria from Fibrobacter (c.f. the suffix -bacter, note the difference with Deferribacteres)
phylum Lentisphaerae versus class Lentisphaeria from Lentisphaera
phylum Nitrospira or Nitrospirae versus class Nitrospira from Nitrospira
phylum Spirochaetes versus class Spirochaetae from Spirochaeta
phylum Synergistetes versus class Synergistetia from Synergistes
phylum Planctomycetes versus Planctomycea from Planctomyces
An exception is the phylum Deinococcus–Thermus, which bears a hyphenated pair of genera—only non-accented Latin letters are accepted for valid names, but phyla are not officially recognised.[101] More recently it has been proposed to amend the Bacteriological Code to specify -aeota as the ending for bacterial phyla and that the names be derived from a type class within the phylum.[103] This would require the following changes:
Acidobacteria → Acidobacteraeota
Actinobacteria → Actinobacteraeota
Proteobacteria → Alphaproteobacteraeota
Aquificae → Aquificaeota
Armatimonadetes → Armatimonadaeota
Firmicutes → Bacillaeota
Bacteroidetes → Bacteroidaeota
Caldiserica → Caldisericaeota
Chlamydiae → Chlamydaeota
Chlorobi → Chlorobaeota
Chloroflexi → Chloroflexaeota
Chrysiogenetes → Chrysiogenaeota
Deferribacteres → Deferribacteraeota
Deinococcus-Thermus → Deinococcaeota
Dictyoglomi → Dictyoglomaeota
Elusimicrobia → Elusimicrobaeota
Fibrobacteres → Fibrobacteraeota
Fusobacteria → Fusobacteraeota
Gemmatimonadetes → Gemmatimonadaeota
Ignavibacteriae → Ignavibacteraeota
Lentisphaerae → Lentisphaeraeota
Euryarchaeota → Methanobacteraeota
Tenericutes → Mollicutaeota
Thaumarchaeota → Nitrososphaeraeota
Nitrospira → Nitrospiraeota
Planctomycetes → Planctomycetaeota
Spirochaetes → Spirochaetaeota
Synergistetes → Synergistaeota
Thermodesulfobacteria → Thermodesulfobacteraeota
Thermomicrobia → Thermomicrobaeota
Crenarchaeota → Thermoproteaeota
Thermotogae → Thermotogaeota
Verrucomicrobia → Verrucomicrobaeota
Names after people[edit]
Main articles: List of bacterial genera named after personal names and List of bacterial genera named after mythological figures
Several species are named after people, either the discoverer or a famous person in the field of microbiology, for example Salmonella is after D.E. Salmon, who discovered it (albeit as "Bacillus typhi"[104]).[105]
For the generic epithet, all names derived from people must be in the female nominative case, either by changing the ending to -a or to the diminutive -ella, depending on the name.[97]
For the specific epithet, the names can be converted into either adjectival form (adding -nus (m.), -na (f.), -num (n.) according to the gender of the genus name) or the genitive of the latinised name.[97]
Names after places[edit]
Main articles: List of bacterial genera named after geographical names and List of bacterial genera named after institutions
Many species (the specific epithet) are named after the place they are present or found (e.g. Thiospirillum jenense). Their names are created by forming an adjective by joining the locality's name with the ending -ensis (m. or f.) or ense (n.) in agreement with the gender of the genus name, unless a classical Latin adjective exists for the place. However, names of places should not be used as nouns in the genitive case.[97]
Vernacular names[edit]
See also: Common name
Despite the fact that some hetero/homogeneus colonies or biofilms of bacteria have names in English (e.g. dental plaque or Star jelly), no bacterial species has a vernacular/trivial/common name in English.
For names in the singular form, plurals cannot be made (singulare tantum) as would imply multiple groups with the same label and not multiple members of that group (by analogy, in English, chairs and tables are types of furniture, which cannot be used in the plural form "furnitures" to describe both members), conversely names plural form are pluralia tantum. However, a partial exception to this is made by the use of vernacular names. However, to avoid repetition of taxonomic names which break the flow of prose, vernacular names of members of a genus or higher taxa are often used and recommended, these are formed by writing the name of the taxa in sentence case roman ("standard" in MS Office) type, therefore treating the proper noun as an English common noun (e.g. the salmonellas), although there is some debate about the grammar of plurals, which can either be regular plural by adding -(e)s (the salmonellas) or using the ancient Greek or Latin plural form (irregular plurals) of the noun (the salmonellae); the latter is problematic as the plural of - bacter would be -bacteres, while the plural of myces (N.L. masc. n. from Gr. masc. n. mukes) is mycetes.[106]
Customs are present for certain names, such as those ending in -monas are converted into -monad (one pseudomonad, two aeromonads and not -monades).
Bacteria which are the etiological cause for a disease are often referred to by the disease name followed by a describing noun (bacterium, bacillus, coccus, agent or the name of their phylum) e.g. cholera bacterium (Vibrio cholerae) or Lyme disease spirochete (Borrelia burgdorferi), note also rickettsialpox (Rickettsia akari) (for more see [107]).
Treponema is converted into treponeme and the plural is treponemes and not treponemata.
Some unusual bacteria have special names such as Quin's oval (Quinella ovalis) and Walsby's square (Haloquadratum walsbyi).
Before the advent of molecular phylogeny, many higher taxonomic groupings had only trivial names, which are still used today, some of which are polyphyletic, such as Rhizobacteria. Some higher taxonomic trivial names are:
Blue-green algae are members of the phylum Cyanobacteria
Green non-sulfur bacteria are members of the phylum Chloroflexi
Green sulfur bacteria are members of the Chlorobi
Purple bacteria are some, but not all, members of the phylum Proteobacteria
Purple sulfur bacteria are members of the order Chromatiales
low G+C Gram-positive bacteria are members of the phylum Firmicutes, regardless of GC content
high G+C Gram-positive bacteria are members of the phylum Actinobacteria, regardless of GC content
Rhizobacteria are members of various genera of proteobacteria
Rhizobia are members of the order Rhizobiales
Lactic streptococci are members of the genus Lactococcus
Coryneform bacteria are members of the family Corynebacteriaceae
Fruiting gliding bacteria or myxobacteria are members of the order Myxococcales
Enterics are members of the order Enterobacteriales, although the term is avoided if they do not live in the intestines, such as Pectobacterium
Acetic acid bacteria are members of the family Acetobacteraceae
Terminology[edit]
The abbreviation for species is sp. (plural spp.) and is used after a generic epithet to indicate a species of that genus. Often used to denote a strain of a genus for which the species is not known either because has the organism has not been described yet as a species or insufficient tests were conducted to identify it. For example Halomonas sp. GFAJ-1
If a bacterium is known and well-studied but not culturable, it is given the term Candidatus in its name
A basonym is original name of a new combination, namely the first name given to a taxa before it was reclassified
A synonym is an alternative name for a taxa, i.e. a taxa was erroneusly described twice
When a taxon is transferred it becomes a new combination (comb. nov.) or nomina nova (nom. nov.)
paraphyly, monophyly and polyphyly
See also[edit]
List of Latin and Greek words commonly used in systematic names
List of Bacteria genera
List of bacterial orders
List of sequenced prokaryotic genomes
Human microbiome project
Microbial ecology
List of clinically important bacteria
List of sequenced archaeal genomes
List of Archaea genera
Species problem
Evolutionary grade
Cryptic species complex
Synonym (taxonomy)
Taxonomy
LPSN, list of accepted bacterial and archaeal names
Cyanobacteria, a phylum of common bacteria but poorly classified at present
Bacterial phyla, a complicated classification
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Jump up ^ app. 9 of BC https://www.ncbi.nlm.nih.gov/books/NBK8808/
^ Jump up to: a b c d Help! Latin! How to avoid the most common mistakes while giving Latin names to newly discovered prokaryotes. Microbiología (Sociedad Española de Microbiología), 1996, 12, 473-475. "Archived copy". Archived from the original on 7 October 2011. Retrieved 2011-04-14.
Jump up ^ Classification of Phyla entry in LPSN [ Euzéby, J.P. (1997). "List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet". Int J Syst Bacteriol. 47 (2): 590–2. doi:10.1099/00207713-47-2-590. ISSN 0020-7713. PMID 9103655. ]
Jump up ^ STACKEBRANDT, E.; RAINEY; WARD-RAINEY, N.L. (1997). "Proposal for a new hierarchic classification system, Actinobacteria classis nov". Int. J. Syst. Bacteriol. 47: 479–491. doi:10.1099/00207713-47-2-479.
^ Jump up to: a b Classification entry in LPSN [ Euzéby, J.P. (1997). "List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet". Int J Syst Bacteriol. 47 (2): 590–2. doi:10.1099/00207713-47-2-590. ISSN 0020-7713. PMID 9103655. ]
^ Jump up to: a b Hierarchical classification of Prokaryotes entry in LPSN [ Euzéby, J.P. (1997). "List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet". Int J Syst Bacteriol. 47 (2): 590–2. doi:10.1099/00207713-47-2-590. ISSN 0020-7713. PMID 9103655. ]
Jump up ^ Murray RGE. (1984). "The higher taxa, or, a place for everything…?". In Krieg NR, Holt JG. Bergey’s manual of systematic bacteriology. 1. Baltimore: The Williams & Wilkins Co. p. 33.
Jump up ^ Oren A, Da Costa MS, Garrity GM, Rainey FA, Rosselló-Móra R, Schink B, Sutcliffe I, Trujillo ME, Whitman WB. (2015). "Proposal to include the rank of phylum in the International Code of Nomenclature of Prokaryotes". Int. J. Syst. Evol. Microbiol. 65: 4284–4287. doi:10.1099/ijsem.0.000664. PMID 26654112. CS1 maint: Multiple names: authors list (link)
Jump up ^ SCHROETER (J.). In: F. COHN (ed.), Kryptogamenflora von Schlesien. Band 3, Heft 3, Pilze. J.U. Kern's Verlag, Breslau, 1885-1889, pp. 1-814.
Jump up ^ Salmonella entry in LPSN [ Euzéby, J.P. (1997). "List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet". Int J Syst Bacteriol. 47 (2): 590–2. doi:10.1099/00207713-47-2-590. ISSN 0020-7713. PMID 9103655. ]
Jump up ^ R. E. BUCHANAN, Taxonomy, Annu. Rev. Microbiol. 1955.9:1-20. http://www.annualreviews.org/doi/pdf/10.1146/annurev.mi.09.100155.000245
Jump up ^ ftp://ftp.ncbi.nih.gov/pub/taxonomy/
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