Bacterial phyla constitute the major lineages of the domain Bacteria . While the exact definition of a bacterial phylum is debated, a popular definition is that a bacterial phylum is a monophyletic lineage of bacteria whose 16S rRNA genes share a pairwise sequence identity of ~75% or less with those of the members of other bacterial phyla. [2]
It has been estimated that ~1,300 bacterial phyla exist. [2] As of May 2020, 41 bacterial phyla are formally accepted by the LPSN, [3] 89 bacterial phyla are recognized on the Silva database, dozens more have been proposed, [4] [5] and hundreds likely remain to be discovered. [2] As of 2017, approximately 72% of widely recognized bacterial phyla were candidate phyla [6] (i.e. have no cultured representatives).
The rank of phylum has been included in the rules of the International Code of Nomenclature of Prokaryotes, using the ending –ota for phylum names that must be based on the name of a genus as its nomenclatural type. [7] [8]
This section may require cleanup to meet Wikipedia's quality standards. The specific problem is: Should be replaced with the lists in doi:10.1099/ijsem.0.006508, which contains all valid publications under the Prokaryotic Code before Dec 2023 plus most of the extra proposals.(December 2024) |
The following is a list of bacterial phyla that have been validly published (not current).
Phylum | Alternative names | Group | Cultured representative | Notes |
---|---|---|---|---|
10bav-F6 [9] | No | |||
"Abawacabacteria" [4] [10] | RIF46 | CPR; Gracilibacteria-related CPR | No | |
"Abditibacteriota" [11] | FBP | Yes [11] | ||
"Absconditabacteria" [12] [10] | SR1 | CPR; Gracilibacteria-related CPR | No | |
ABY1 [13] | OD1-ABY1 [14] | CPR; Parcubacteria | No | |
"Bipolaricaulota" [15] | OP1, "Acetothermia" | |||
Acidobacteriota | "Acidobacteria" | Yes [16] | ||
Actinomycetota | "Actinobacteria" | Terrabacteria | Yes [17] | |
"Adlerbacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 4 | No | ||
"Aerophobota" / "Aerophobetes" | CD12, BHI80-139 | |||
"Amesbacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Andersenbacteria" [4] | RIF9 | CPR; Parcubacteria; Parcubacteria 4-related | No | |
Armatimonadota [15] | "Armatimonadetes", OP10 | Terrabacteria | Yes [19] | |
"Aminicenantes" [15] | OP8 | |||
AncK6 [9] | ||||
Apal-E12 [9] | ||||
Atribacterota [15] | OP9, JS1 | No | ||
Aquificota | "Aquificae" | |||
"Azambacteria" i [18] [10] | CPR; Patescibacteria; Parcubacteria; unclassified Parcubacteria | No | split by Anantharaman et al. … | |
"Azambacteria" ii [18] [10] | CPR; Patescibacteria; Parcubacteria; unclassified Parcubacteria | No | … (Oct 2016) as being polyphyletic | |
Bacteroidota | "Bacteroidetes" | FCB group | Yes | |
Balneolota [20] | Yes | |||
Bdellovibrionota | ||||
"Beckwithbacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Berkelbacteria" [21] [10] | ACD58 | CPR; Saccharibacteria-related CPR | No | |
BHI80-139 [9] | ||||
"Blackburnbacteria" [4] | RIF35 | CPR; Microgenomates | No | |
"Brennerbacteria" [4] [10] | RIF18 | CPR; Parcubacteria; Parcubacteria 3 | No | |
"Brownbacteria" [22] | CPR; Parcubacteria; unclassified Parcubacteria | No | ||
"Buchananbacteria" [4] [10] | RIF37 | CPR; Parcubacteria; Parcubacteria 1 | No | |
Caldisericota [15] | OP5, [23] "Caldiserica" | FCB group | Yes [24] | |
Calditrichota [25] | FCB group [26] | |||
"Calescamantes" | EM19 | |||
"Campbellbacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 4 | No | seem to be polyphyletic: two clades | |
Campylobacterota | ||||
Chlamydiota | "Chlamydiae" [27] | PVC group | ||
Chlorobiota | "Chlorobi" | FCB group | ||
Chloroflexota | "Chloroflexi" | "Terrabacteria" | ||
Chisholmbacteria [4] | RIF36 | CPR; "Microgenomates" | No | |
Chrysiogenota | "Chrysiogenetes" | |||
"Cloacimonetes" [28] | WWE1 | FCB group [26] | ||
"Coatesbacteria" [4] | RIF8 | No | ||
"Collierbacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Colwellbacteria" [4] [10] | RIF41 | CPR; Parcubacteria; Parcubacteria 3 | No | |
Coprothermobacterota | ||||
"Curtissbacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
CPR-1 [1] | CPR | No | ||
CPR-3 [1] | CPR | No | ||
"Cyanobacteria" | Terrabacteria | |||
"Dadabacteria" [29] | No | |||
"Daviesbacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Delphibacteria" [6] | FCB group | No | ||
"Delongbacteria" [4] | RIF26, H-178 | No | ||
Deferribacterota | Deferribacteres | |||
Deinococcota | Deinococcus–Thermus | Terrabacteria | ||
"Dependentiae" [30] | TM6 | |||
Dictyoglomota | Dictyoglomi [31] | |||
"Dojkabacteria" [10] | WS6 | CPR; Microgenomates-related CPR | ||
"Dormibacteraeota" [32] | AD3 | No | ||
"Doudnabacteria" [18] [10] | SM2F11 | CPR; Parcubacteria; Parcubacteria 1-related | No | |
"Edwardsbacteria" [5] [4] | RIF29, UBP-2 [33] | No | ||
"Eisenbacteria" [4] | RIF28 | FCB group | No | |
Elusimicrobiota | Elusimicrobia, OP7, Termite Group 1 (TG1) [23] | Yes [34] | ||
"Eremiobacteraeota" [35] [32] | WPS-2, Palusbacterota [36] | No | ||
"Falkowbacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 1 | No | ||
"Fermentibacteria" [37] | Hyd24-12 | No | ||
"Fertabacteria" [6] | CPR; Gracilibacteria-related CPR | No | ||
Fibrobacterota | "Fibrobacteres" | FCB group | ||
"Firestonebacteria" [4] | RIF1 | No | ||
"Fervidibacteria" | OctSpa1-106 | |||
"Fischerbacteria" [4] | RIF25 | No | ||
Bacillota | "Firmicutes" | Terrabacteria | ||
"Fraserbacteria" [4] | RIF31 | No | ||
Fusobacteriota | "Fusobacteria" | |||
Gemmatimonadota | Gemmatimonadetes [38] | FCB group [26] | Yes [38] | |
"Glassbacteria" [4] | RIF5 | No | ||
"Giovannonibacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 4-related | No | ||
"Gottesmanbacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Gracilibacteria" [39] [10] | GN02, BD1-5, SN-2 | CPR; Patescibacteria; Gracilibacteria-related CPR | No | |
"Gribaldobacteria" [4] [10] | CPR; Parcubacteria; Parcubacteria 2 | No | ||
"Handelsmanbacteria" [4] | RIF27 | No | ||
"Harrisonbacteria" [4] [10] | RIF43 | CPR; Parcubacteria; Parcubacteria 3 | No | |
"Howlettbacteria" [10] | CPR; Saccharibacteria-related CPR | No | ||
"Hugbacteria" [22] | CPR; Parcubacteria; unclassified Parcubacteria | No | ||
"Hydrogenedentes" | NKB19 | No | ||
Ignavibacteriota | "Ignavibacteria", ZB1 | FCB group | ||
"Jacksonbacteria" [4] [10] | RIF38 | CPR; Parcubacteria; Parcubacteria 1 | No | |
"Jorgensenbacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 3 | No | ||
"Kaiserbacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 4 | No | ||
"Katanobacteria" [40] [10] | WWE3 | CPR; Microgenomates-related | No | |
"Kazanbacteria" [10] [4] | Kazan | CPR; Saccharibacteria-related CPR | No | |
"Kerfeldbacteria" [4] [10] | RIF4 | CPR; Parcubacteria; Parcubacteria 1 | No | |
Kiritimatiellota | ||||
"Komeilibacteria" [4] [10] | RIF6 | CPR; Parcubacteria; Parcubacteria 1 | No | sometimes misspelled as "Komelilbacteria" [4] |
"Kryptonia" [41] | No | |||
KSB1 | No | |||
"Krumholzibacteriota" [33] | ||||
"Kuenenbacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 1 | No | ||
"Lambdaproteobacteria" [4] | RIF24 | Proteobacteria | No | |
"Latescibacteria" | WS3 | FCB group [26] | No | |
LCP-89 [42] | ||||
Lentisphaerota | "Lentisphaerae", vadinBE97 | PVC group | ||
"Levybacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Lindowbacteria" [4] | RIF2 | CPR; Saccharibacteria-related CPR | No | |
"Liptonbacteria" [4] [10] | RIF42 | CPR; Parcubacteria; Parcubacteria 3 | No | |
"Lloydbacteria" [4] [10] | RIF45 | CPR; Parcubacteria; Parcubacteria 4 | No | |
"Magasanikbacteria" [18] [43] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 1 | No | ||
"Margulisbacteria" [4] | RIF30 | No | ||
"Marinimicrobia" | SAR406, Marine Group A | FCB group [26] | Yes | |
"Melainabacteria" [44] | No | |||
"Microgenomates" [45] | OP11 | CPR; Patescibacteria | No | Superphylum |
"Modulibacteria" [39] [46] | KSB3, GN06 | No | ||
"Moranbacteria" [18] [10] | OD1-i [18] | CPR; Patescibacteria; Parcubacteria; unclassified Parcubacteria | No | |
"Muproteobacteria" [4] | RIF23 | Proteobacteria | No | |
Myxococcota | ||||
NC10 [47] [13] | No | |||
"Nealsonbacteria" [4] [10] | RIF40 | CPR; Parcubacteria; Parcubacteria 2 | No | |
"Niyogibacteria" [4] | RIF11 | CPR; Parcubacteria; Parcubacteria 4-related | No | |
Nitrospinota | "Nitrospinae" [48] | Yes [49] [50] | ||
Nitrospirota | "Nitrospirae" | Yes | ||
"Nomurabacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 1 | No | ||
"Omnitrophica" [15] | OP3 | PVC group | No | |
"Pacebacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Parcubacteria" [12] | OD1 | CPR | No | Superphylum |
"Parcubacteria" 1 [10] | CPR; Parcubacteria | No | ||
"Parcubacteria" 2 [10] | CPR; Parcubacteria | No | ||
"Parcubacteria" 3 [10] | CPR; Parcubacteria | No | ||
"Parcubacteria" 4 [10] | CPR; Parcubacteria | No | ||
"Parcunitrobacteria" [51] | CPR; Parcubacteria; unclassified Parcubacteria [52] | No | Superphylum | |
PAUC34f [53] | sponge‐associated unclassified lineage (SAUL) | FCB group | ||
"Peregrinibacteria" [54] [55] [56] [57] [10] | PER | CPR; Gracilibacteria-related CPR | No | |
"Peribacteria" [10] | CPR; Gracilibacteria-related CPR | No | ||
Planctomycetota | "Planctomycetes" | PVC group | ||
"Poribacteria" [58] | PVC group | |||
"Portnoybacteria" [4] | RIF22 | CPR; Parcubacteria; Parcubacteria 4-related | No | |
Pseudomonadota | "Proteobacteria" | |||
"Raymondbacteria" [4] | RIF7 | No | ||
Riflebacteria [4] | RIF32 | No | ||
Rhodothermota | ||||
"Roizmanbacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Rokubacteria" [29] | No | |||
"Ryanbacteria" [4] [10] | RIF10 | CPR; Parcubacteria; Parcubacteri 4-related | No | |
"Saccharibacteria" [30] [10] | TM7 | CPR; Saccharibacteria-related CPR | Yes | |
"Saltatorellota" [59] | ||||
"Schekmanbacteria" [4] | RIF3 | Proteobacteria | No | |
"Shapirobacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Spechtbacteria" [4] [10] | RIF19 | CPR; Parcubacteria; Parcubacteria 2 | No | |
Spirochaetota | "Spirochaetes" | |||
"Staskawiczbacteria" [4] [10] | RIF20 | CPR; Parcubacteria; Parcubacteria 2 | No | |
"Sumerlaeota" [60] [61] | BRC1 | |||
"Sungbacteria" [4] [10] | RIF17 | CPR; Parcubacteria; Parcubacteria 4-related | No | |
Synergistota | "Synergistetes" | |||
TA06 [62] | No | |||
"Tagabacteria" [4] [10] | RIF12 | CPR; Parcubacteria; Parcubacteria 4-related | No | |
"Taylorbacteria" [4] [10] | RIF16 | CPR; Parcubacteria; Parcubacteria 4 | No | |
"Tectomicrobia" [63] | ||||
Mycoplasmatota | "Tenericutes" | |||
"Terrybacteria" [4] [10] | RIF13 | CPR; Parcubacteria; Parcubacteria 2 | No | |
Thermodesulfobacteriota | "Thermodesulfobacteria" | |||
Thermomicrobiota | "Thermomicrobia" | |||
Thermotogota | "Thermotogae", OP2, EM3 [23] | Yes [64] | ||
"Torokbacteria" [10] | CPR; Parcubacteria; unclssified Parcubacteria | No | ||
UBP-1 [5] | No | |||
UBP-3 [5] | No | |||
UBP-4 [5] | No | |||
UBP-5 [5] | No | |||
UBP-6 [5] | No | |||
UBP-7 [5] | No | |||
UBP-8 [5] | No | |||
UBP-9 [5] | No | |||
UBP-10 [5] | No | |||
UBP-11 [5] | No | |||
UBP-12 [5] | No | |||
UBP-13 [5] | No | |||
UBP-14 [5] | No | |||
UBP-15 [5] | No | |||
UBP-16 [5] | No | |||
UBP-17 [5] | No | |||
"Uhrbacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 1 | No | seem to be polyphyletic: two clades | |
"Veblenbacteria" [4] | RIF39 | CPR; Parcubacteria; Parcubacteria 1-related | No | |
Verrucomicrobiota | "Verrucomicrobia" | PVC group | ||
"Vogelbacteria" [4] [10] | RIF14 | CPR; Parcubacteria; Parcubacteria 4 | No | |
"Wallbacteria" [4] | RIF33 | No | ||
"Wildermuthbacteria" [4] [10] | RIF21 | CPR; Parcubacteria; Parcubacteria 2 | No | |
"Wirthbacteria" [65] | CPR-related bacteria | No | ||
"Woesebacteria" [18] | CPR; Patescibacteria; Microgenomates | No | ||
"Wolfebacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; Parcubacteria 3 | No | ||
"Woykebacteria" [4] [22] | RIF34 | CPR; Microgenomates | No | |
WOR-1 [62] | No | |||
WOR-2 [62] | No | |||
WOR-3 [62] | No | |||
"Yanofskybacteria" [18] [10] | CPR; Patescibacteria; Parcubacteria; unclassified Parcubacteria | No | ||
"Yonathbacteria" [4] [10] | RIF44 | CPR; Parcubacteria; Parcubacteria 4 | No | |
"Zambryskibacteria" [4] [10] | RIF15 | CPR; Parcubacteria; Parcubacteria 4 | No | |
ZB2 | OD1-ZB2 [14] | CPR; Parcubacteria | No | |
"Zixibacteria" [66] | FCB group | No |
Despite the unclear branching order for most bacterial phyla, several groups of phyla consistently cluster together and are referred to as supergroups or superphyla. In some instances, bacterial clades clearly consistently cluster together but it is unclear what to call the group. For example, the Candidate Phyla Radiation includes the Patescibacteria group which includes Microgenomates group which includes over 11 bacterial phyla.
The CPR is a descriptive term referring to a massive monophyletic radiation of candidate phyla that exists within the Bacterial domain. [67] It includes two main clades, the Microgenomates and Parcubacteria groups, each containing the eponymous superphyla and a few other phyla.
The superphylum Patescibacteria was originally proposed to encompass the phyla Microgenomates (OP11), Parcubacteria (OD1), and Gracilibacteria (GNO2 / BD1-5). [26] More recent phylogenetic analyses show that the last common ancestor of these taxa is the same node as that of CPR. [68]
The Sphingobacteria (FCB group) includes Bacteroidota, Calditrichota, Chlorobiota, candidate phylum "Cloacimonetes", Fibrobacterota, Gemmatimonadota, Ignavibacteriota, candidate phylum "Latescibacteria", candidate phylum "Marinimicrobia", and candidate phylum "Zixibacteria". [26] [69]
Microgenomates was originally thought to be a single phylum although evidence suggests it actually encompasses over 11 bacterial phyla, [18] [4] including Curtisbacteria, Daviesbacteria, Levybacteria, Gottesmanbacteria, Woesebacteria, Amesbacteria, Shapirobacteria, Roizmanbacteria, Beckwithbacteria, Collierbacteria, Pacebacteria.
Parcubacteria was originally described as a single phylum using fewer than 100 16S rRNA sequences. With a greater diversity of 16S rRNA sequences from uncultured organisms now available, it is estimated it may consist of up to 28 bacterial phyla. [2] In line with this, over 14 phyla have now been described within the Parcubacteria group, [18] [4] including Kaiserbacteria, Adlerbacteria, Campbellbacteria, Nomurabacteria, Giovannonibacteria, Wolfebacteria, Jorgensenbacteria, Yanofskybacteria, Azambacteria, Moranbacteria, Uhrbacteria, and Magasanikbacteria.
It has been proposed that some classes of the phylum Proteobacteria may be phyla in their own right, which would make Proteobacteria a superphylum. [70] For example, the Deltaproteobacteria group does not consistently form a monophyletic lineage with the other Proteobacteria classes. [71]
The Planctobacteria (PVC group) includes Chlamydiota, Lentisphaerota, candidate phylum "Omnitrophica", Planctomycetota, candidate phylum "Poribacteria", and Verrucomicrobiota. [26] [69]
The proposed superphylum, Terrabacteria, [72] includes Actinomycetota, "Cyanobacteria"/"Melainabacteria"-group, Deinococcota, Chloroflexota, Bacillota, and candidate phylum OP10. [72] [73] [26] [69]
Several candidate phyla (Microgenomates, Omnitrophica, Parcubacteria, and Saccharibacteria) and several accepted phyla (Elusimicrobiota, Caldisericota, and Armatimonadota) have been suggested to actually be superphyla that were incorrectly described as phyla because rules for defining a bacterial phylum are lacking or due to a lack of sequence diversity in databases when the phylum was first established. [2] For example, it is suggested that candidate phylum Parcubacteria is actually a superphylum that encompasses 28 subordinate phyla and that phylum Elusimicrobia is actually a superphylum that encompasses 7 subordinate phyla. [70]
Given the rich history of the field of bacterial taxonomy and the rapidity of changes therein in modern times, it is often useful to have a historical perspective on how the field has progressed in order to understand references to antiquated definitions or concepts.
When bacterial nomenclature was controlled under the Botanical Code, the term division was used, but now that bacterial nomenclature (with the exception of cyanobacteria) is controlled under the Bacteriological Code, the term phylum is preferred.
In 1987, Carl Woese, regarded as the forerunner of the molecular phylogeny revolution, divided Eubacteria into 11 divisions based on 16S ribosomal RNA (SSU) sequences, listed below. [75] [76]
Traditionally, phylogeny was inferred and taxonomy established based on studies of morphology. The advent of molecular phylogenetics has allowed for improved elucidation of the evolutionary relationship of species by analyzing their DNA and protein sequences, for example their ribosomal DNA. [87] The lack of easily accessible morphological features, such as those present in animals and plants, hampered early efforts of classification and resulted in erroneous, distorted and confused classification, an example of which, noted Carl Woese, is Pseudomonas whose etymology ironically matched its taxonomy, namely "false unit". [75] Many bacterial taxa were re-classified or re-defined using molecular phylogenetics.
The advent of molecular sequencing technologies has allowed for the recovery of genomes directly from environmental samples (i.e. bypassing culturing), leading to rapid expansion of our knowledge of the diversity of bacterial phyla. These techniques are genome-resolved metagenomics and single-cell genomics.
In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall.
Pseudomonadota is a major phylum of Gram-negative bacteria. Currently, they are considered the predominant phylum within the realm of bacteria. They are naturally found as pathogenic and free-living (non-parasitic) genera. The phylum comprises six classes Acidithiobacillia, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Hydrogenophilia, and Zetaproteobacteria. The Pseudomonadota are widely diverse, with differences in morphology, metabolic processes, relevance to humans, and ecological influence.
Acidobacteriota is a phylum of Gram-negative bacteria. Its members are physiologically diverse and ubiquitous, especially in soils, but are under-represented in culture.
The Chlamydiota are a bacterial phylum and class whose members are remarkably diverse, including pathogens of humans and animals, symbionts of ubiquitous protozoa, and marine sediment forms not yet well understood. All of the Chlamydiota that humans have known about for many decades are obligate intracellular bacteria; in 2020 many additional Chlamydiota were discovered in ocean-floor environments, and it is not yet known whether they all have hosts. Historically it was believed that all Chlamydiota had a peptidoglycan-free cell wall, but studies in the 2010s demonstrated a detectable presence of peptidoglycan, as well as other important proteins.
Fibrobacterota is a small bacterial phylum which includes many of the major rumen bacteria, allowing for the degradation of plant-based cellulose in ruminant animals. Members of this phylum were categorized in other phyla. The genus Fibrobacter was removed from the genus Bacteroides in 1988.
Dehalococcoides is a genus of bacteria within class Dehalococcoidia that obtain energy via the oxidation of hydrogen and subsequent reductive dehalogenation of halogenated organic compounds in a mode of anaerobic respiration called organohalide respiration. They are well known for their great potential to remediate halogenated ethenes and aromatics. They are the only bacteria known to transform highly chlorinated dioxins, PCBs. In addition, they are the only known bacteria to transform tetrachloroethene to ethene.
Gammaproteobacteria is a class of bacteria in the phylum Pseudomonadota. It contains about 250 genera, which makes it the most genus-rich taxon of the Prokaryotes. Several medically, ecologically, and scientifically important groups of bacteria belong to this class. All members of this class are Gram-negative. It is the most phylogenetically and physiologically diverse class of the Pseudomonadota.
The PVC superphylum is a superphylum of bacteria named after its three important members, Planctomycetota, Verrucomicrobiota, and Chlamydiota. Cavalier-Smith postulated that the PVC bacteria probably lost or reduced their peptidoglycan cell wall twice. It has been hypothesised that a member of the PVC clade might have been the host cell in the endosymbiotic event that gave rise to the first proto-eukaryotic cell.
Terrabacteria is a taxon containing approximately two-thirds of prokaryote species, including those in the gram positive phyla as well as the phyla "Cyanobacteria", Chloroflexota, and Deinococcota.
Saccharibacteria, formerly known as TM7, is a major bacterial lineage. It was discovered through 16S rRNA sequencing.
The class Zetaproteobacteria is the sixth and most recently described class of the Pseudomonadota. Zetaproteobacteria can also refer to the group of organisms assigned to this class. The Zetaproteobacteria were originally represented by a single described species, Mariprofundus ferrooxydans, which is an iron-oxidizing neutrophilic chemolithoautotroph originally isolated from Kamaʻehuakanaloa Seamount in 1996 (post-eruption). Molecular cloning techniques focusing on the small subunit ribosomal RNA gene have also been used to identify a more diverse majority of the Zetaproteobacteria that have as yet been unculturable.
Bacterial taxonomy is subfield of taxonomy devoted to the classification of bacteria specimens into taxonomic ranks.
There are several models of the Branching order of bacterial phyla, one of these was proposed in 1987 paper by Carl Woese.
Ruegeria pomeroyi is a species of Gram-negative, rod-shaped, aerobic dimethylsulfoniopropionate-demethylating bacterium. Its type strain is DSS-3T. Its genome has been sequenced.
Lentisphera araneosa is a marine bacteria strain in the bacterial phylum Lentisphaerota. They are able to produce viscous transparent exopolymers and grow attached to each other by the polymer in a three-dimensional configuration. They are part of the natural surface bacterial population in the Atlantic and Pacific oceans. They are less than 1% of the total bacterial community. This species is gram negative, non-motile, non-pigmented, aerobic, chemoheterotrophic, and facultatively oligotrophic sphere-shaped. Its genome has been sequenced.
The Microgenomatota or Microgenomates are a proposed supergroup of bacterial candidate phyla in the Candidate Phyla Radiation.
Gracilibacteria is a bacterial candidate phylum formerly known as GN02, BD1-5, or SN-2. It is part of the Candidate Phyla Radiation and the Patescibacteria group.
Katanobacteria is a bacterial phylum formerly known as WWE3. It has candidate status, meaning there are no cultured representatives, and is a member of the Candidate Phyla Radiation (CPR).
NC10 is a bacterial phylum with candidate status, meaning its members remain uncultured to date. The difficulty in producing lab cultures may be linked to low growth rates and other limiting growth factors.
Ann Patricia Wood is a retired British biochemist and bacteriologist who specialized in the ecology, taxonomy and physiology of sulfur-oxidizing chemolithoautotrophic bacteria and how methylotrophic bacteria play a role in the degradation of odour causing compounds in the human mouth, vagina and skin. The bacterial genus Annwoodia was named to honor her contributions to microbial research in 2017.
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