Bergey's Classification of Bacteria

Classification of bacteria according to Bergey's Manual [Bergey's Manual of Systematic Bacteriology. 1st edition. 4 vols. (1984)]
  1. Gram-negative Bacteria of medical and commercial importance: (1984)
    Spirochetes, spiral and curved, aerobic and facultatively aerobic rods, obligate anaerobes, aerobic and anaerobic cocci, sulfate and sulfur-reducing, rickettsias, clamydias, mycoplasmas
  2. Gram-positive Bacteria of medical and commercial importance: (1986)
    Cocci, endospore-forming and nonsporing rods, mycobacteria, nonfilamentous actinomycetes

Kingdom Procaryotae

Divisions
  1. Gracilicutes
    Procaryotes with thin cell walls, implying a gram-negative type cell wall
  2. Firmicutes
    Procaryotes with thick and strong skin, indicating a gram-positive type cell wall
  3. Tenericutes
    Procaryotes of a pliable and soft nature, indicating the lack of a rigid cell wall
  4. Mendosicutes
    Procaryotes that lack conventional peptidoglycan (archaeobacteria)

    Spirochetes
      Spirochaetales
        Spirochaetaceae
          Borrelia
          Cristispira
          Spirochaeta
          Treponema
        Leptospiraceae
          Leptospira
      Other: Hindgut Spirochetes of Termites and Cryptocercus punctulatus (wood-eating cockroach)

    Aerobic/Microaerophilic, Motile, Helical/Vibrioid Gram-Negative Bacteria
        Alteromonas
        Aquaspirillum
        Azospirillum
        Bdellovibrio
        Campylobacter
        Cellvibrio
        Halovibrio
        Helicobacter
        Herbaspirillum
        Marinomonas
        Micavibrio
        Oceanospirillum
        Spirillum
        Sporospirillum
        Vampirovibrio

    Nonmotile (or rarely), Gram-Negative Curved Bacteria
      Spirosomaceae
        Flectobacillus
        Runella
        Spirosoma
      Other Genera
        Ancyclobacter
        Brachyarcus
        Cyclobacterium
        Meniscus
        Microcyclus
        Pelosigma

    Gram-Negative Aerobic Rods and Cocci
      Pseudomonadaceae
        Frateuria
        Pseudomonas
        Xanthomonas
        Zooglea
      Azotobacteriaceae
        Azomonas
        Azotobacter
      Rhizobiaceae
        Agrobacterium
        Bradyrhizobium
        Phyllobacterium
        Rhizobium
      Methylococcaceae
        Methylococcus
        Methylomonas
      Acetobacteraceae
        Acetobacter
        Gluconobacter
      Halobacteriaceae
        Halobacterium
        Halococcus
      Legionellaceae
        Legionella
      Neisseriaceae
        Acinetobacter Kingella
        Moraxella
        Neisseria
      Other Genera
        Acidiphilium
        Acidomonas
        Acidothermus
        Afipia
        Agromonas
        Alcaligenes
        Alteromonas
        Aminobacter
        Aquaspirillum
        Azorhizobium
        Beijerinckia
        Bordetella
        Brucella
        Chromohalobacter
        Chryseomonas
        Comoamonas
        Cupriavidas
        Deleya
        Derxia
        Ensifer
        Erythrobacter
        Flavimonas
        Flavobacterium
        Francisella
        Halomonas
        Hydrogenophaga
        Janthinobacterium
        Lampropedia
        Marinobacter
        Marinomonas
        Mesophilobacter
        Methylobacillus
        Methylobacterium
        Methylophaga
        Methylophilus
        Methylovorus
        Morococcus
        Oceanospirillum
        Oligella
        Paracoccus
        Phenylobacterium
        Psychrobacter
        Rhizobacter
        Roseobacter
        Rugamonas
        Serpens
        Sinorhizobium
        Sphingobacterium
        Thermoleophilum
        Thermomicrobium
        Thermus
        Variovorax
        Volcaniella
        Weeksella
        Xanthobacter
        Xylella
        Xylophilus
        Zoogloea

    Facultatively Anaerobic Gram-Negative Rods
      Enterobacteriaceae
        Arsenophonus
        Budvicia
        Buttiauxella
        Cedecea
        Citrobacter
        Edwardsiella
        Enterobacter
        Erwinia
        Escherichia
        Ewingella
        Hafnia
        Klebsiella
        Kluyvera
        Leclercia
        Leminorella
        Moellerella
        Morganella
        Obesumbacterium
        Pantoea
        Pragia
        Proteus
        Providencia
        Rahnella
        Salmonella
        Serratia
        Shigella
        Tatumella
        Xenorhabdus
        Yersinia
        Yokenella
      Vibrionaceae
        Aeromonas
        Enhydrobacter
        Photobacterium
        Plesiomonas
        Vibrio
      Pasturellaceae
        Actinobacillus
        Haemophilus
        Pasteurella
      Other Genera
        Calymmatobacterium
        Cardiobacterium
        Cedecea
        Eikenella
        Gardnerella         (has thin, gram-positive walls but stains as negative)
        Kluyvera
        Obesumbacterium
        Rahnella
        Streptobacillus
        Tatumella
        XenorhabdusChromobacterium
        Zymomonas

    Gram-Negative Anaerobic, Straight, Curved, and Helical Rods
      Bacteroidaceae
        Acetivibrio
        Acetoanaerobium
        Acetofilamentum
        Acetogenium
        Acetomicrobium
        Acetothermus
        Acidaminobacter
        Anaerobiospirillum
        Anaerorhabdus
        Anaerovibrio
        Bacteroides
        Butyrivibrio         (has thin, gram-positive walls but stains as negative)
        Centipeda
        Fervidobacterium
        Fibrobacter
        Fusobacterium
        Haloanaerobium
        Halobacteroides
        Ilyobacter
        Lachnospira         (has thin, gram-positive walls but stains as negative)
        Leptotrichia
        Malonomonas
        Megamonas
        Mitsuokella
        Oxalobacter
        Pectinatus
        Pelobacter
        Porphyromonas
        Prevotella
        Propionigenium
        Propionispira
        Rikenella
        Roseburia
        Ruminobacter
        Sebaldella
        Selenomonas
        Sporomusa
        Succinimonas
        Succinivibrio
        Syntrophobacter
        Syntrophosmonas
        Thermobacteroides
        Thermospipho
        Thermotoga
        Tissierella
        Wolinella
        Zymophilus
      Dissimulatory Sulfate- or Sulfur-Reducing Bacteria
        Desulfobacter
        Desulfobacterium
        Desulfobulbus
        Desulfococcus
        Desulfomicrobium
        Desulfomonas
        Desulfomonile
        Desulfonema
        Desulfosarcina
        Desulfotomaculum         (also endospore-forming)
        Desulfovibrio
        Desulfurella
        Desulfuromonas
        Thermodesulfobacterium
      Anaerobic Gram-Negaitve Cocci
        Veillonellaceae
          Acidaminococcus
          Megasphaera
          Syntrophococcus
          Veillonella

    Rickettsias and Chlamydias
      Rickettsiales
        Rickettsiaceae
          Cowdria
          Coxiella
          Ehrlichia
          Neorickettsia
          Rickettsia
          Rickettsiella
          Rochalimaea
          Wolbachia
        Bartonellaceae
          Bartonella
          Grahamella
        Anaplasmataceae
          Aegyptianella
          Anaplasma
          Eperythrozoon
          Haemobartonella
      Chlamydiales
        Chlamydiaceae
          Chlamydia

    Mycoplasmas
      Mycoplasmataceae
        Mycoplasma
        Ureaplasma
      Acholeplasmataceae
        Acholeplasma
      Spiroplasmataceae
        Spiroplasma
      Other Genera
        Anaeroplasma
        Asteroleplasma
        Thermoplasma

    Endosymbionts
      Endosymbionts of Protozoa
        Caedibacter
        Holospora
        Lyticum
        Pseudocaedibacter
        Tectibacter
      Endosymbionts of Insects (blood sucking, plant sap-sucking, cellulose and stored grain feeders, and insects feeding on complex diets)
        Blattabacterium
      Endosymbionts of Fungi and Invertebrates other than Arthropods (Fungi, Sponges, Coelenterates, Helminthes, Annelids, Marine worms and mollusks)
      Endosymbionts of Protozoa, ciliates, flagellates, and amoebas
        Caedibacter
        Holospora
        Lyticum
        Pseudocaedibacter
        Tectibacter

    Gram-Positive Cocci
      Aerobic, Catalase-Positive Genera
        Deinobacter
        Deinococcus
        Marinococcus
        Micrococcus
        Planococcus
        Saccharococcus
        Staphylococcus
        Stomatococcus
      Aerotolerant, Catalase-Negative Genera
        Aerococcus Enterococcus
        Gemella
        Lactococcus
        Leuconostoc
        Melissococcus
        Pediococcus
        Streptococcus         (Pyogenic Hemolytic Streptococci, Oral Streptococci, Enterococci, Lactic Acid Streptococci, Anaerobic Streptococci)
        Trichococcus
        Vagococcus
      Anaerobic, Catalase-Negative Genera
        Coprococcus
        Peptococcus
        Peptostreptococcus
        Ruminococcus
        Sarcina

    Endospore-Forming Gram-Positive Rods and Cocci
        Amphibacillus
        Bacillus
        Clostridium
        Desulfotomaculum         (also dissimilatory sulfate reducer)
        Oscillospira
        Sporolactobacillus
        Sporosarcina
        Sulfidobacillus
        Syntrophospora

    Regular, Nonsporing Gram-Positive Rods
        Brochothrix
        Carnobacterium
        Caryophanon
        Erysipelothrix
        Kurthia
        Lactobacillus
        Listeria
        Renibacterium

    Irregular, Nonsporing Gram-Positive Rods
        Acetobacterium
        Acetogenium
        Actinomyces
        Aeromicrobium
        Agromyces
        Arachnia
        Arcanobacterium
        Arthrobacter
        Aureobacterium
        Bifidobacterium
        Brachybacterium
        Brevibacterium
        Butyrivibrio         (has thin, gram-positive walls, but stains as negative)
        Caseobacter
        Cellulomonas
        Clavibacter
        Coriobacterium
        Corynebacterium
        Curtobacterium
        Dermabacter
        Eubacterium
        Exigouibacterium
        Falcivibrio
        Gardnerella         (has thin, gram-positive walls but stains as negative)
        Jonesia
        Lachnospira         (has thin, gram-positive walls but stains as negative)
        Microbacterium
        Mobiluncus
        Pimelobacter
        Propionibacterium
        Rarobacter
        Rothia
        Rubrobacter
        Sphaerobacter
        Terrabacter
        Thermoanaerobacter

    Mycobacteria
      Mycobacteriaceae
        Mycobacterium

    Nocardioforms
        Intrasporangium
        Micropolyspora
        Nocardia
        Nocardioides
        Oerskovia
        Promicromonospora
        Pseudonocardia
        Rhodococcus
        Saccharopolyspora

    Anoxygenic Phototrophic Bacteria
      Purple Sulfur Bacteria: Internal Sulfur Granules
        Chromatiaceae
          Amoebobacter
          Chromatium
          Lamprobacter
          Lamprocystis
          Thiocapsa
          Thiocystis
          Thiodictyon
          Thiopedia
          Thiospirillum
      Purple Sulfur Bacteria: External Sulfur Granules
        Ectothiorhodospiraceae
          Ectothiorhodopsin
          Ectothiorhodospira
      Purple Nonsulfur Bacteria
          Rhodobacter
          Rhodyclus
          Rhodomicrobium
          Rhodopila
          Rhodopseudomonas
          Rhodospirillum
      Green Nonsulfur Bacteria
          Heliobacillus
          Heliobacterium
      Green Sulfur Bacteria
          Anacalochloris
          Chlorobium
          Chloroherpeton
          Pelodictyon
          Prosthecochloris
      Multicellular Filamentous Green Bacteria
          Chloroflexus
          Chloronema
          Heliothrix
          Oscillochloris
      Anaerobic Chemotrophic Bacteria
          Erythrobacter

    Oxygenic Phototrophic Bacteria
      Cyanobacteria
        Chroococcales
          Chamaespiphon
          Cyanothece
          Gloeobacter
          Gloeocapsa
          Gloethece
          Microcystis
          Myxobaktron
          Synechococcus
          Synechocystis
        Pleurocapsales
          Chroococcidiopsis
          Dermocarpa
          Dermocarpella
          Myxosarcina
          Pleurocapsa
          Xenococcus
        Oscillatoriales
          Arthrospira
          Crinalium
          Lyngbya
          Microcoleus
          Oscillatoria
          Pseudanabaena
          Spirulina
          Starria
          Trichodesmium
        Nostocales
          Nostocaceae
            Anabaena
            Aphanizomenon
            Cylindrospermum
            Nodularia
            Nostoc
          Scytonemataceae
            Scytonema
          Rivulariaceae
            Calothrix
        Stigonematales
          Chlorogloeopsis
          Fischerella
          Geitleria
          Stigonema
        Prochlorales
          Prochloraceae
            Prochloron Prochlorothrix

    Aerobic Chemolithotrophic Bacteria and Associated Organisms
      Nitrifying Bacteria
        Nitrobacteraceae
      Nitrate-oxidizing bacteria
          Nitrobacter
          Nitrococcus
          Nitrospina
          Nitrospira
      Ammonia-oxidizing bacteria
          Nitrosococcus
          Nitrosolobus
          Nitrosomonas
          Nitrosospira
          Nitrosovibrio
      Colorless sulfur-oxidizing bacteria
          Acidiphilium
          Macromonas
          Thermothrix
          Thiobacillus
          Thiobacterium
          Thiodendron
          Thiomicrospira
          Thiosphaera
          Thiospira
          Thiovulum
      Obligate Chemolithotrophic Hydrogen Bacteria
          Hydrogenobacter
      Iron- and Manganese-oxidizing and/or -Depositing Bacteria
        Siderocapsaceae
          Aquaspirillum
          Bilophococcus
          Gallionella           (both iron-oxidizing and appendaged)
          Leptospirillum
          Metallogenium
          Naumaniella
          Ochrobium
          Siderocapsa
          Siderococcus
          Sulfobacillus

    Budding (indicated by *) and/or Appendaged Bacteria
      Prosthecate Bacteria
          Ancalomicrobium *
          Asticcacaulus
          Caulobacter
          Dichotomicrobium
          Filomicrobium
          Hirschia
          Hyphomicrobium *
          Hyphomonas *
          Labrys *
          Pedomicrobium *
          Prosthecobacter
          Prosthecomicrobium *
          Stella *
          Verrucomicrobium
        Planctomycetales
          Gemmata
          Pirelulla
      Nonprosthecate Budding Bacteria
          Angulomicrobium
          Blastobacter
          Ensifer
          Gemmiger
          Isosphaera
          Planctomyces

    Nonbudding Bacteria
        Asticcacaulis
        Caulobacter
        Gallionella
        Nevskia
        Prosthecobacter

    Morphologically Unusual Budding Bacteria (involved in iron and manganese deposition)
        Caulococcus
        Kuznezovia
        Metallogenium
        Seliberia
        Thiodendron

    Sheathed Bacteria
        Clonothrix
        Crenothrix
        Haliscominobacter
        Leptothrix
        Lieskeela
        Phragmidiothrix
        Sphaerotilus

    Nonphotosynthetic, Nonfruiting Gliding Bacteria
      Single-celled, Rod-shaped Gliding Bacteria
        Cytophagales
          Cytophagaceae
            Capnocytophaga
            Chitinophaga
            Cytophaga
            Flexibacter
            Flexithrix
            Microscilla
            Sporocytophaga
            Thermonema
        Lysobacterales
          Lysobacteriaceae
            Lysobacter
      Flattened, Filamentous Gliding Bacteria
        Simonsiellaceae
          Alysiella
          Simonsiella
      Sulfur-Oxidizing Gliding Bacteria
        Beggiatoales
          Beggiatoaceae
            Achromatium
            Beggiatoa
            Thioploca
            Thiospirillopsis
            Thiothrix
      The Pelonemas
        Pelonemataceae
          Achroonema Desmanthus
          Pelonema
          Peloploca
        Other Genera
          Agitococcus
          Desulfonema
          Herpetosiphon
          Isosphaera
          Leucothrix
          Saprospira
          Toxothrix
          Vitreoscilla

    Gliding, Fruiting Bacteria
        Archangiaceae
          Archangium
        Cystobacteraceae
          Cystobacter
          Melittangium
          Stigmatella
      Myxococcales
        Myxococcaceae
          Myxococcus
        Polyangiaceae
          Chondromyces
          Nannocystis
          Polyangium
        Other Genera
          Angiococcus
          Corallococcus
          Haploangium
          Sorangium

Archaeobacteria (an older term for the Archaea)

    The Methanogens
      Cell Walls With Pseudomurein
        Methanobacteriales
          Methanobacteriaceae
            Methanobacterium
            Methanobrevibacter
          Methanothermaceae
            Methanothermus
      Cell Walls Without Pseudomurein
        Methanococcales
          Methanococcaceae
            Methanococcus
          Methanosarcinaceae
            Methanolacinia
            Methanococcoides
            Methanolobus
            Methanothrix
        Methanomicrobiales
          Methanomicrobiaceae
            Methanomicrobium
            Methanogenium
            Methanospirillum
          Methanoplanaceae
            Methanoplanus
          Other Genera
            Methanocorpusculum
            Methanoculleus
            Methanohalobium
            Methanohalophilus
            Methanosarcina
            Methanosphaera

    Archaeal Sulfate Reducers
      Archaeoglobales
        Archaeoglobaceae
          Archaeoglobus

    Extremely Halophilic, Aerobic Archaeobacteria
      Halobacteriales
        Halobacteriaceae
          Haloarcula
          Halobacterium
          Halococcus
          Haloferax
          Natronobacterium
          Natronococcus

    Cell Wall-Less Archaeobacteria
          Thermoplasma

    Extremely Thermophilic and Hyperthermophilic So - Metabolizers
      Cocci, Optimum Growth Below pH4
            Desulfurolobus Metallosphaera
        Sulfolobales
          Sulfolobaceae
            Acidianus
            Sulfolobus
      Rods That Use H2 as Energy Source
            Pyrobaculum
        Thermoproteales
          Thermoproteaceae
            Thermofilum
            Thermoproteus
      Cocci or Disc-Shaped That Oxidize H2S
          Hyperthermus
          Staphylothermus
          Thermodiscus
          Desulfurococcaceae
            Desulfurococcus
            Pyrodictium
        Thermococcales
          Thermococcaceae
            Thermococcus
            Pyrococcus

Actinomycetes

    Nocardioform Actinomycetes
        Actinobispora
        Actinokineospora
        Actinopolyspora
        Amycolata
        Amycolatopsis
        Faenia (Micropolyspora)
        Gordona
        Intrasporangium
        Jonesia
        Kibdelosporangium
        Nocardia
        Nocardioides
        Oerskovia
        Promicromonospora
        Pseudoamycolata
        Pseudonocardia
        Rhodococcus
        Saccharomonospora
        Saccharopolyspora
        Terrabacter
        Tsukamurella

    Actinomycetes With Multilocar Sporangia
        Dermatophilus
        Frankia
        Geodermatophilus

    Actinoplanetes
        Actinoplanes
        Ampullariella
        Catelbatospora
        Dactylosporangium
        Micromonospora
        Pilimelia

    Streptomyces and Related Genera
        Intrasporangium
        Kineosporia
        Sporichthya
        Streptomyces
        Streptoverticillium

    Maduromycetes
        Actinomadura
        Microbispora
        Microtetraspora
        Planobispora
        Planomonospora
        Spirillospora
        Streptosporangium

    Thermomonospora and Related Genera
        Actinosynnema
        Nocardiopsis
        Streptoalloteichus
        Thermomonospora

    Thermoactinomycetes
        Thermoactinomyces

    Other Actinomycete Genera
        Glycomyces
        Kibdelosporangium
        Kitasatosporia
        Saccarothrix