# -bacter

The suffix -bacter is used in microbiology for many genera and is intended to mean "bacteria".

## Meaning

Bacter is a Neo-Latin (i.e. Modern Latin) term coined from bacterium, which in turn derives from the Greek βακτήριον, meaning small staff (diminutive of βακτηρία). Consequently, it formally means "rod". It differs from the suffix -bacterium in grammatical gender, as the suffix -bacter is male, whereas the suffix -bacterium) is neuter; this was decided in Juridical (or Judicial) Opinion n° 3 of the Bacteriological Code.
Nevertheless, for historical reasons, two archaeal species finish in -bacter: Methanobrevibacter and Methanothermobacter.

## Usage

Juridical Opinion n° 2 in the Bacteriological Code discusses the declension of the word, given that authors differently assumed the genitive case of bacter to be bactris (3rd declension words of Latin origin ending in =ter), bacteri (2nd declension) or bacteris (3rd declension, used for words of Greek origin, such as astris). The Opinion opts for the latter: consequently, higher taxa are formed with the stem =bacter- and not =bactr-. In Juridical Opinion n° 3 it was established to be masculine. For example, Campylobacter is a genus of Campylobacterales. These rules were established so that the specific epithets were paired with the correct gender as imposed by the Bacteriological Code and the correct higher taxon names were formed. An interesting effect of this is that the genus Fibrobacter gives its name both to the phylum Fibrobacteres, which obeys Latin grammar, and to the class Fibrobacteria, which follows the recommendation of using the suffix -ia

## Genera

| Genus | Phylum | Class | Order | Family |
| Acanthopleuribacter | Acidobacteriota | Holophagae | Acanthopleuribacterales | Acanthopleuribacteraceae |
| Acetobacter | Pseudomonadota | Alphaproteobacteria | Rhodospirillales | Acetobacteraceae |
| Achromobacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Alcaligenaceae |
| Acidaminobacter | Bacillota | Clostridia | Clostridiales | Clostridiaceae |
| Acinetobacter | Pseudomonadota | Gammaproteobacteria | Pseudomonadales | Moraxellaceae |
| Actibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Adhaeribacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cytophagaceae |
| Aestuariibacter | Pseudomonadota | Gammaproteobacteria | Alteromonadales | Alteromonadaceae |
| Aggregatibacter | Pseudomonadota | Gammaproteobacteria | Pasteurellales | Pasteurellaceae |
| Albibacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Methylocystaceae |
| Algibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Alkalibacter | Bacillota | Clostridia | Clostridiales | Eubacteriaceae |
| Alkanibacter | Pseudomonadota | Gammaproteobacteria | Nevskiales | Nevskiaceae |
| Altererythrobacter | Pseudomonadota | Alphaproteobacteria | Sphingomonadales | Erythrobacteraceae |
| Aminobacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Phyllobacteriaceae |
| Amoebobacter | Pseudomonadota | Gammaproteobacteria | Chromatiales | Chromatiaceae |
| Anaerobacter | Bacillota | Clostridia | Clostridiales | Clostridiaceae |
| Anaeromyxobacter | Myxococcota | Myxococcia | Myxococcales | Myxococcaceae |
| Anaerosporobacter | Bacillota | Clostridia | Clostridiales | Clostridiaceae |
| Ancylobacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Xanthobacteraceae |
| Angustibacter | Actinomycetota | Actinomycetia | Actinomycetales | Kineosporiaceae |
| Antarctobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Aquabacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Hyphomicrobiaceae |
| Arcobacter | Campylobacterota | Campylobacteria | Campylobacterales | Campylobacteraceae |
| Arenibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Arthrobacter | Actinomycetota | Actinomycetia | Actinomycetales | Micrococcaceae |
| Asaccharobacter | Actinomycetota | Actinomycetia | Coriobacteriales | Coriobacteriaceae |
| Atopobacter | Bacteroidota | Bacilli | Lactobacillales | Carnobacteriaceae |
| Auritidibacter | Actinomycetota | Actinomycetia | Actinomycetales | Micrococcaceae |
| Azotobacter | Pseudomonadota | Gammaproteobacteria | Pseudomonadales | Pseudomonadaceae |
| Blastobacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Nitrobacteraceae |
| Bryobacter | Acidobacteriota | Acidobacteriia | | |
| Caedibacter | Pseudomonadota | Gammaproteobacteria | Thiotrichales | |
| Caldanaerobacter | Bacillota | Clostridia | Thermoanaerobacterales | Thermoanaerobacteraceae |
| Caldicoprobacter | Bacillota | Clostridia | Clostridiales | Caldicoprobacteraceae |
| Caloranaerobacter | Bacillota | Clostridia | Clostridiales | Clostridiaceae |
| Caminibacter | Campylobacterota | Nautiliia | Nautiliales | Nautiliaceae |
| Campylobacter | Campylobacterota | Campylobacteria | Campylobacterales | Campylobacteraceae |
| Caseobacter | Actinomycetota | Actinomycetia | Actinomycetales | Corynebacteriaceae |
| Caulobacter | Pseudomonadota | Alphaproteobacteria | Caulobacterales | Caulobacteraceae |
| Celeribacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Chelatobacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Rhizobiaceae |
| Chelonobacter | Pseudomonadota | Gammaproteobacteria | Pasteurellales | Pasteurellaceae |
| Chitinibacter | Pseudomonadota | Betaproteobacteria | Neisseriales | Neisseriaceae |
| Chromohalobacter | Pseudomonadota | Gammaproteobacteria | Oceanospirillales | Halomonadaceae |
| Citrobacter | Pseudomonadota | Gammaproteobacteria | Enterobacteriales | Enterobacteriaceae |
| Clavibacter | Actinomycetota | Actinomycetia | Actinomycetales | Microbacteriaceae |
| Clostridiisalibacter | Bacillota | Clostridia | Clostridiales | Clostridiaceae |
| Cohaesibacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Cohaesibacteraceae |
| Conexibacter | Actinomycetota | Actinomycetia | Solirubrobacterales | Conexibacteraceae |
| Congregibacter | Pseudomonadota | Gammaproteobacteria | | |
| Coprothermobacter | Coprothermobacterota | Coprothermobacteria | Coprothermobacterales | Coprothermobacteraceae |
| Croceibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Cronobacter | Pseudomonadota | Gammaproteobacteria | Enterobacteriales | Enterobacteriaceae |
| Cryptanaerobacter | Bacillota | Clostridia | Clostridiales | Peptococcaceae |
| Cucumibacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Hyphomicrobiaceae |
| Curvibacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Comamonadaceae |
| Cystobacter | Myxococcota | Myxococcia | Myxococcales | Cystobacteraceae |
| Deferribacter | Deferribacterota | Deferribacteres | Deferribacterales | Deferribacteraceae |
| Defluvibacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Phyllobacteriaceae |
| Dehalobacter | Bacillota | Clostridia | Clostridiales | Peptococcaceae |
| Deinobacter | Deinococcota | Deinococci | Deinococcales | Deinococcaceae |
| Dendrosporobacter | Bacillota | Negativicutes | Selenomonadales | Veillonellaceae |
| Dermabacter | Actinomycetota | Actinomycetia | Actinomycetales | Dermabacteraceae |
| Desertibacter | Pseudomonadota | Alphaproteobacteria | Rhodospirillales | Rhodospirillaceae |
| Desulfitibacter | Bacillota | Clostridia | Clostridiales | Peptococcaceae |
| Desulfobacter | Thermodesulfobacteriota | Desulfobacteria | Desulfobacterales | Desulfobacteraceae |
| Dethiobacter | Bacillota | Clostridia | Clostridiales | Syntrophomonadaceae |
| Dethiosulfatibacter | Bacillota | Clostridia | Clostridiales | |
| Diaphorobacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Comamonadaceae |
| Dichelobacter | Pseudomonadota | Gammaproteobacteria | Cardiobacteriales | Cardiobacteriaceae |
| Dinoroseobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Dyadobacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cytophagaceae |
| Edaphobacter | Acidobacteriota | Acidobacteriia | Acidobacteriales | Acidobacteriaceae |
| Effluviibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cytophagaceae |
| Empedobacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Enhydrobacter | Pseudomonadota | Gammaproteobacteria | Pseudomonadales | Moraxellaceae |
| Enterobacter | Pseudomonadota | Gammaproteobacteria | Enterobacteriales | Enterobacteriaceae |
| Erythrobacter | Pseudomonadota | Alphaproteobacteria | Sphingomonadales | Erythrobacteraceae |
| Fabibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Flammeovirgaceae |
| Ferruginibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Chitinophagaceae |
| Fibrobacter | Fibrobacterota | Fibrobacteria | Fibrobacterales | Fibrobacteraceae |
| Filibacter | Bacillota | Bacilli | Bacillales | Planococcaceae |
| Flavihumibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Chitinophagaceae |
| Flavisolibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Chitinophagaceae |
| Flexibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cytophagaceae |
| Fluoribacter | Pseudomonadota | Gammaproteobacteria | Legionellales | Legionellaceae |
| Fodinibacter | Actinomycetota | Actinomycetia | Actinomycetales | Intrasporangiaceae |
| Fontibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cyclobacteriaceae |
| Fulvibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Fundibacter | Pseudomonadota | Gammaproteobacteria | Oceanospirillales | Alcanivoracaceae |
| Fusibacter | Bacillota | Clostridia | Clostridiales | |
| Gaetbulibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Galbibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Gelidibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Gemmobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Geoalkalibacter | Thermodesulfobacteriota | Desulfuromonadia | Desulfuromonadales | Geobacteraceae |
| Geobacter | Thermodesulfobacteriota | Desulfuromonadia | Desulfuromonadales | Geobacteraceae |
| Geopsychrobacter | Thermodesulfobacteriota | Desulfuromonadia | Desulfuromonadales | Geobacteraceae |
| Geosporobacter | Bacillota | Clostridia | Clostridiales | Clostridiaceae |
| Geothermobacter | Thermodesulfobacteriota | Desulfuromonadia | Desulfuromonadales | Geobacteraceae |
| Gilvibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Glaciibacter | Actinomycetota | Actinomycetia | Actinomycetales | Microbacteriaceae |
| Gluconacetobacter | Pseudomonadota | Alphaproteobacteria | Rhodospirillales | Acetobacteraceae |
| Gluconobacter | Pseudomonadota | Alphaproteobacteria | Rhodospirillales | Acetobacteraceae |
| Gordonibacter | Actinomycetota | Actinomycetia | Coriobacteriales | Coriobacteriaceae |
| Gracilibacter | Bacillota | Clostridia | Clostridiales | Gracilibacteraceae |
| Granulibacter | Pseudomonadota | Alphaproteobacteria | Rhodospirillales | Acetobacteraceae |
| Gulosibacter | Actinomycetota | Actinomycetia | Actinomycetales | Microbacteriaceae |
| Haematobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Halanaerobacter | Bacillota | Clostridia | Halanaerobiales | Halobacteroidaceae |
| Halarsenatibacter | Bacillota | Clostridia | Halanaerobiales | Halanaerobiaceae |
| Haliscomenobacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Saprospiraceae |
| Helicobacter | Campylobacterota | Campylobacteria | Campylobacterales | Helicobacteraceae |
| Humibacter | Actinomycetota | Actinomycetia | Actinomycetales | Microbacteriaceae |
| Hydrogenobacter | Aquificota | Aquificae | Aquificales | Aquificaceae |
| Hymenobacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cytophagaceae |
| Ilumatobacter | Actinomycetota | Actinomycetia | Acidimicrobiales | Acidimicrobiaceae |
| Ilyobacter | Fusobacteriota | Fusobacteriia | Fusobacteriales | Fusobacteriaceae |
| Indibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cyclobacteriaceae |
| Iodobacter | Pseudomonadota | Betaproteobacteria | Neisseriales | Neisseriaceae |
| Janibacter | Actinomycetota | Actinomycetia | Actinomycetales | Intrasporangiaceae |
| Koreibacter | Actinomycetota | Actinomycetia | Actinomycetales | |
| Krokinobacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Ktedonobacter | Chloroflexota | Ktedonobacteria | Ktedonobacterales | Ktedonobacteraceae |
| Lacibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Chitinophagaceae |
| Lamprobacter | Pseudomonadota | Gammaproteobacteria | Chromatiales | Chromatiaceae |
| Laribacter | Pseudomonadota | Betaproteobacteria | Neisseriales | Neisseriaceae |
| Leucobacter | Actinomycetota | Actinomycetia | Actinomycetales | Microbacteriaceae |
| Limibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Flammeovirgaceae |
| Limnobacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Burkholderiaceae |
| Litoreibacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Litoribacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cytophagaceae |
| Luteibacter | Pseudomonadota | Gammaproteobacteria | Xanthomonadales | Xanthomonadaceae |
| Luteolibacter | Verrucomicrobiota | Verrucomicrobiae | Verrucomicrobiales | Verrucomicrobiaceae |
| Lutibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Lutimaribacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Lysobacter | Pseudomonadota | Gammaproteobacteria | Xanthomonadales | Xanthomonadaceae |
| Mangrovibacter | Pseudomonadota | Gammaproteobacteria | Enterobacteriales | Enterobacteriaceae |
| Maribacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Marinobacter | Pseudomonadota | Gammaproteobacteria | Alteromonadales | Alteromonadaceae |
| Maritimibacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Meridianimaribacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Mesoflavibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Mesophilobacter | Pseudomonadota | Gammaproteobacteria | Pseudomonadales | Pseudomonadaceae |
| Methylobacter | Pseudomonadota | Gammaproteobacteria | Methylococcales | Methylococcaceae |
| Microaerobacter | Bacillota | Bacilli | Bacillales | Bacillaceae |
| Modestobacter | Actinomycetota | Actinomycetia | Actinomycetales | Geodermatophilaceae |
| Modicisalibacter | Pseudomonadota | Gammaproteobacteria | Oceanospirillales | Halomonadaceae |
| Mucilaginibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Sphingobacteriaceae |
| Naxibacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Oxalobacteraceae |
| Neptuniibacter | Pseudomonadota | Gammaproteobacteria | Oceanospirillales | Oceanospirillaceae |
| Nesiotobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Nitrobacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Nitrobacteraceae |
| Oceanobacter | Pseudomonadota | Gammaproteobacteria | Oceanospirillales | Oceanospirillaceae |
| Octadecabacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Odoribacter | Bacteroidota | Bacteroidia | Bacteroidales | Porphyromonadaceae |
| Oleibacter | Pseudomonadota | Gammaproteobacteria | Oceanospirillales | Oceanospirillaceae |
| Olivibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Sphingobacteriaceae |
| Ornithinibacter | Actinomycetota | Actinomycetia | Actinomycetales | Intrasporangiaceae |
| Oscillibacter | Bacillota | Clostridia | Clostridiales | Ruminococcaceae |
| Oxalobacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Oxalobacteraceae |
| Oxobacter | Bacillota | Clostridia | Clostridiales | Clostridiaceae |
| Paludibacter | Bacteroidota | Bacteroidia | Bacteroidales | Porphyromonadaceae |
| Pannonibacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Papillibacter | Bacillota | Clostridia | Clostridiales | Ruminococcaceae |
| Parapedobacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Sphingobacteriaceae |
| Parasegetibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Chitinophagaceae |
| Patulibacter | Actinomycetota | Actinomycetia | Solirubrobacterales | Patulibacteraceae |
| Paucibacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | |
| Pedobacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Sphingobacteriaceae |
| Pelobacter | Thermodesulfobacteriota | Desulfuromonadia | Desulfuromonadales | Desulfuromonadaceae |
| Peredibacter | Bdellovibrionota | Bdellovibrionia | Bdellovibrionales | Bacteriovoracaceae |
| Perexilibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Flammeovirgaceae |
| Persicobacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Flammeovirgaceae |
| Petrobacter | Pseudomonadota | Betaproteobacteria | Hydrogenophilales | Hydrogenophilaceae |
| Phaeobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Phocoenobacter | Pseudomonadota | Gammaproteobacteria | Pasteurellales | Pasteurellaceae |
| Pilibacter | Bacillota | Bacilli | Lactobacillales | Enterococcaceae |
| Pimelobacter | Actinomycetota | Actinomycetia | Actinomycetales | Nocardioidaceae |
| Piscinibacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | |
| Plantibacter | Actinomycetota | Actinomycetia | Actinomycetales | Microbacteriaceae |
| Polaribacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Polynucleobacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Burkholderiaceae |
| Pontibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cytophagaceae |
| Porphyrobacter | Pseudomonadota | Alphaproteobacteria | Sphingomonadales | Erythrobacteraceae |
| Prolixibacter | Bacteroidota | Bacteroidia | | |
| Propionibacter | Pseudomonadota | Betaproteobacteria | Rhodocyclales | Rhodocyclaceae |
| Prosthecobacter | Verrucomicrobiota | Verrucomicrobiae | Verrucomicrobiales | Verrucomicrobiaceae |
| Pseudaminobacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Phyllobacteriaceae |
| Pseudocaedibacter | Pseudomonadota | Alphaproteobacteria | Rickettsiales | |
| Pseudoclavibacter | Actinomycetota | Actinomycetia | Actinomycetales | Microbacteriaceae |
| Pseudoramibacter | Bacillota | Clostridia | Clostridiales | Eubacteriaceae |
| Pseudorhodobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Pseudoxanthobacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Xanthobacteraceae |
| Psychrilyobacter | Fusobacteriota | Fusobacteriia | Fusobacteriales | Fusobacteriaceae |
| Psychrobacter | Pseudomonadota | Gammaproteobacteria | Pseudomonadales | Moraxellaceae |
| Pyramidobacter | Synergistota | Synergistia | Synergistales | Synergistaceae |
| Ramlibacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Comamonadaceae |
| Rarobacter | Actinomycetota | Actinomycetia | Actinomycetales | Rarobacteraceae |
| Rathayibacter | Actinomycetota | Actinomycetia | Actinomycetales | Microbacteriaceae |
| Rhizobacter | Pseudomonadota | Gammaproteobacteria | Pseudomonadales | Pseudomonadaceae |
| Rhodanobacter | Pseudomonadota | Gammaproteobacteria | Xanthomonadales | Xanthomonadaceae |
| Rhodobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Rivibacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | |
| Roseinatronobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Roseobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Rubidibacter | Cyanobacteria | | Chroococcales | |
| Rubrobacter | Actinomycetota | Actinomycetia | Rubrobacterales | Rubrobacteraceae |
| Ruminobacter | Pseudomonadota | Gammaproteobacteria | Aeromonadales | Succinivibrionaceae |
| Saccharibacter | Pseudomonadota | Alphaproteobacteria | Rhodospirillales | Acetobacteraceae |
| Saccharobacter | Pseudomonadota | Gammaproteobacteria | Enterobacteriales | Enterobacteriaceae |
| Salegentibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Salinibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Rhodothermaceae |
| Sandaracinobacter | Pseudomonadota | Alphaproteobacteria | Sphingomonadales | Sphingomonadaceae |
| Sanguibacter | Actinomycetota | Actinomycetia | Actinomycetales | Sanguibacteraceae |
| Saxeibacter | Actinomycetota | Actinomycetia | Actinomycetales | Nakamurellaceae |
| Sedimentibacter | Bacillota | Clostridia | Clostridiales | |
| Sediminibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Segetibacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Chitinophagaceae |
| Selenihalanaerobacter | Bacillota | Clostridia | Halanaerobiales | Halobacteroidaceae |
| Serinibacter | Actinomycetota | Actinomycetia | Actinomycetales | Beutenbergiaceae |
| Silicibacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Sinobacter | Pseudomonadota | Gammaproteobacteria | Xanthomonadales | Sinobacteraceae |
| Siphonobacter | Bacteroidota | Sphingobacteria | Sphingobacteriales | Cytophagaceae |
| Solirubrobacter | Actinomycetota | Actinomycetia | Solirubrobacterales | Solirubrobacteraceae |
| Sphaerobacter | Thermomicrobiota | Thermomicrobia | Sphaerobacterales | Sphaerobacteraceae |
| Spongiibacter | Pseudomonadota | Gammaproteobacteria | | |
| Sporanaerobacter | Bacillota | Clostridia | Clostridiales | |
| Sporobacter | Bacillota | Clostridia | Clostridiales | Ruminococcaceae |
| Sporohalobacter | Bacillota | Clostridia | Halanaerobiales | Halobacteroidaceae |
| Stenothermobacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Stenoxybacter | Pseudomonadota | Betaproteobacteria | Neisseriales | Neisseriaceae |
| Steroidobacter | Pseudomonadota | Gammaproteobacteria | Xanthomonadales | Sinobacteraceae |
| Stibiobacter | | | | |
| Subsaxibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Sulfitobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Syntrophobacter | Thermodesulfobacteriota | Syntrophobacteria | Syntrophobacterales | Syntrophobacteraceae |
| Tectibacter | Pseudomonadota | Alphaproteobacteria | Rickettsiales | |
| Tepidanaerobacter | Bacillota | Clostridia | Thermoanaerobacterales | Thermoanaerobacteraceae |
| Tepidibacter | Bacillota | Clostridia | Clostridiales | Peptostreptococcaceae |
| Teredinibacter | Pseudomonadota | Gammaproteobacteria | Alteromonadales | |
| Terrabacter | Actinomycetota | Actinomycetia | Actinomycetales | Intrasporangiaceae |
| Tetrathiobacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Alcaligenaceae |
| Thalassobacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Thermaerobacter | Bacillota | Clostridia | Clostridiales | |
| Thermoanaerobacter | Bacillota | Clostridia | Thermoanaerobacterales | Thermoanaerobacteraceae |
| Thermohalobacter | Bacillota | Clostridia | Clostridiales | Clostridiaceae |
| Thermolithobacter | Bacillota | Thermolithobacteria | Thermolithobacterales | Thermolithobacteraceae |
| Thermosediminibacter | Bacillota | Clostridia | Thermoanaerobacterales | |
| Thermosulfidibacter | Aquificota | Aquificae | Aquificales | |
| Thioalkalibacter | Pseudomonadota | Gammaproteobacteria | Chromatiales | Halothiobacillaceae |
| Thiobacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | |
| Thiohalobacter | Pseudomonadota | Gammaproteobacteria | | |
| Trichlorobacter | Thermodesulfobacteriota | Desulfuromonadia | Desulfuromonadales | Geobacteraceae |
| Tropicibacter | Pseudomonadota | Alphaproteobacteria | Rhodobacterales | Rhodobacteraceae |
| Turicibacter | Bacillota | Erysipelotrichia | Erysipelotrichales | Erysipelotrichaceae |
| Ulvibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Umboniibacter | Pseudomonadota | Gammaproteobacteria | | |
| Verminephrobacter | Pseudomonadota | Betaproteobacteria | Burkholderiales | Comamonadaceae |
| Vitellibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Volucribacter | Pseudomonadota | Gammaproteobacteria | Pasteurellales | Pasteurellaceae |
| Xanthobacter | Pseudomonadota | Alphaproteobacteria | Hyphomicrobiales | Xanthobacteraceae |
| Xylanibacter | Bacteroidota | Bacteroidia | Bacteroidales | Prevotellaceae |
| Zeaxanthinibacter | Bacteroidota | Flavobacteria | Flavobacteriales | Flavobacteriaceae |
| Zymobacter | Pseudomonadota | Gammaproteobacteria | Oceanospirillales | Halomonadaceae |