Classification of Bacteria

Classification of bacteria helps scientists, medical microbiologists, and epidemiologists recognize different bacterial species and understand the effects of similar species. The following article will cover a scientific flowchart that will help you understand the different groups of bacteria clearly.
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What drew me towards becoming a microbiologist was the world of unseen organisms. There are millions and millions of these microscopic organisms around and even within us. For a common man, there may not be much difference between a bacterium and a virus. Bacteria are unicellular microorganisms that come in different shapes. There are different kinds of bacteria, like beneficial bacteria as well as pathogenic bacteria. Beneficial bacteria help in fermentation of food and drink, making antibiotics, killing pests, and even digestion of food. Pathogenic bacteria, on the other hand, are the main reason for diseases. To be able to differentiate between the helpful and harmful bacteria, scientists have come up with a scientific classification of these organisms.

Classification of Bacteria of Medical Importance

The classification helps in identification of organisms according to groups. These groups contain organisms that share common characteristics and traits from other organisms in a different group. The classification of bacteria of medical importance has been carried out according to the 'Gram reaction' all these years. Gram reaction is a medical staining test named after Christian Gram who came up with the process in 1884. He found out that these organisms have the ability to retain the crystal violet iodine complex after treating them with organic solvents like alcohol and acetone.

Organisms that are Gram-positive retain the stain color and look purple or blue-black under bright field microbiology. Those that cannot retain the dye complex need to be stained with a counterstain like carbol fuchsin and are called Gram-negative bacteria. Along with the Gram reaction, scientists also use the shape of bacteria to classify them. There are different types of bacteria shapes, like cocci (round), bacilli (stick or rod-shaped), or spiral.

Scientific Classification of Bacteria Based on Bergy's Manual

Bergy's Manual of Systematic Bacteriology is like the Holy Testament for microbiologists. This manual is the guiding light to identify bacterial species and understanding their characteristics. The manual was first published by David Hendricks Bergy in 1923, and helped in the classification based on their structure and functional characteristics. The following table contains the classification of bacteria by shape and function according to the Bergy's Manual.

Kingdom Prokaryotae
Division II -Bacteria
Medically Important Bacterial Group Classification by Shape and Function
Part 1 Phototrophic bacteria These are aquatic bacteria that can produce carbohydrates from CO2 with the help of photosynthetic pigments
Part 2 Gliding bacteria These are rods that can move by gliding in a layer of slime; these may form complex fruiting bodies
Part 3 Sheathed bacteria These are rods that are surrounded by a sheath of iron or manganese oxides; some of these rods have flagella for movement.
Part 4 Budding and/or appendages bacteria This is diverse group of rods that can reproduce by forming buds or appendages
Part 5 Spirochetes These are slender, helically-coiled bacteria that move by rotation or flexion of the cell
Part 6 Spiral and curved bacteria These are helically curved rods that can move with a corkscrew-like motion
Part 7 Gram-negative aerobic rods and cocci These are rods and spheres that are aerobic Gram-negative bacteria
Part 8 Gram-negative facultatively anaerobic rods These are rods that are Gram-negative and can survive in the absence of oxygen
Part 9 Gram-negative anaerobic rods These are rods that are strictly anaerobic Gram-negative organisms
Part 10 Gram-negative cocci and coccobacilli These are spheres that are Gram-negative bacteria
Part 11 Gram-negative anaerobic cocci These are spheres that are strictly anaerobic Gram-negative organisms
Part 12 Chemolithotrophic bacteria These bacteria use nitrogen, sulfur, and iron compounds for their energy and structural components
Part 13 Methane-producing bacteria These are rods and spheres that obtain energy from carbohy­drates forming methane as an end product
Part 14 Gram-positive cocci These are spheres facultative Gram-positive organisms
Part 15 Endospore-forming rods and cocci These are rods and spheres that can form endospores during their life cycles
Part 16 Gram-positive as porogenous rods These are rod-shaped bacteria that do not form spores and give Gram-positive porogenous rods
Part 17 Actinomycetes and related organisms This is a very large group of aerobic and anaerobic rods
Part 18 The rickettsia These are small rod-shaped bacteria that are transmitted by arthropods, and can multiply only within a host cell that also includes chlamydiae
Part 19 The mycoplasmas These are very small, multi-shaped bacteria that lack a true cell wall

Classification of Bacteria Flowchart

The following is a flowchart that contains names of most of the bacterial species under the specific groups according to their Gram reaction.

Classification of Bacteria of Medical Importance that give Gram-positive Reaction
This classification was carried out in 1984 and places cocci, endospore-forming and non-sporing rods, mycobacteria, and non-filamentous actinomycetes in this group.

Classification of Bacteria of Medical Importance that give Gram-negative Reaction
This classification was carried out in 1986 and placed spirochetes, spiral and curved, aerobic bacteria and facultatively aerobic rods, obligate anaerobic bacteria, aerobic and anaerobic cocci, sulfate and sulfur-reducing, rickettsias, clamydias, and mycoplasmas in this group.

The Kingdome Prokaryotae is divided into four divisions: Gracilicutes, Firmicutes, Tenericutes, Mendosicutes (Archeabacteria).

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
Archaeobacteria
  • The Methanogens
    1. Cell Walls With Pseudomurein
      1. Methanobacteriales
        1. Methanobacteriaceae
          1. Methanobacterium
          2. Methanobrevibacter
      2. Methanothermaceae
        1. Methanothermus
    2. Cell Walls With Pseudomurein
      1. Methanococcales
        1. Methanococcaceae
          1. Methanococcus
      2. Methanosarcinaceae
        1. Methanococcaceae
          1. Methanolacinia
          2. Methanococcoides
          3. Methanolobus
          4. Methanothrix
      3. Methanomicrobiales
        1. Methanomicrobiaceae
          1. Methanomicrobium
          2. Methanogenium
          3. Methanospirillum
        2. Methanoplanaceae
          1. Methanoplanus
        3. Other Genera
          1. Methanocorpusculum
          2. Methanoculleus
          3. Methanohalobium
          4. Methanohalophilus
          5. Methanosarcina
          6. Methanosphaera
  • Archaeal Sulfate Reducers
    1. Archaeoglobales
      1. Archaeoglobaceae
        1. Archaeoglobus
  • Extremely Halophilic, Aerobic Archaeobacteria
    1. Halobacteriales
      1. Halobacteriaceae
        1. Haloarcula
        2. Halobacterium
        3. Halococcus
        4. Haloferax
        5. Natronobacterium
        6. Natronococcus
  • Cell Wall-Less Archaeobacteria
    1. Thermoplasma
  • Extremely Thermophilic and Hyperthermophilic So - Metabolizers
    1. Cocci, Optimum Growth Below pH4
      1. Desulfurolobus Metallosphaera
    2. Sulfolobales
      1. Sulfolobaceae
        1. Acidianus
        2. Sulfolobus
      2. Rods That Use H2 as Energy Source
        1. Pyrobaculum
      3. Thermoproteales
        1. Thermococcaceae
          1. Thermofilum
          2. Thermoproteus
      4. Cocci or Disc-Shaped That Oxidize H2S
        1. Hyperthermus
        2. Staphylothermus
        3. Thermodiscus
        1. Desulfurococcaceae
          1. Desulfurococcus
          2. Pyrodictium
      5. Thermococcales
        1. Thermococcaceae
          1. Thermococcus
          2. Pyrococcus
  • Spirochetes
    1. Spirochaetales
      1. Spirochaetaceae
        1. Borrelia
        2. Cristispira
        3. Spirochaeta
        4. Treponema
      2. Leptospiraceae
        1. Leptospira
    2. Other: Hindgut Spirochetes of Termites and Cryptocercus punctulatus (wood-eating cockroach)
  • Gram-positive Cocci
    1. Aerobic, Catalase-Positive Genera
      1. Deinobacter
      2. Deinococcus
      3. Marinococcus
      4. Micrococcus
      5. Planococcus
      6. Saccharococcus
      7. Staphylococcus
      8. Stomatococcus
    2. Aerotolerant, Catalase-Negative Genera
      1. Aerococcus Enterococcus
      2. Gemella
      3. Lactococcus
      4. Leuconostoc
      5. Melissococcus
      6. Pediococcus
      7. Streptococcus (Pyogenic Hemolytic Streptococci, Oral Streptococci,Enterococci, Lactic Acid Streptococci, Anaerobic Streptococci)
      8. Trichococcus
      9. Vagococcus
    3. Anaerobic, Catalase-Negative Genera
      1. Coprococcus
      2. Peptococcus
      3. Peptostreptococcus
      4. Ruminococcus
      5. Sarcina
  • Endospore-Forming Gram-positive Rods and Cocci
    Amphibacillus
    Bacillus
    Clostridium
    Desulfotomaculum (also dissimilatory sulfate reducer)
    Oscillospira
    Sporolactobacillus
    Sporosarcina
    Sulfidobacillus
    Syntrophospora
  • 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
  • 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
    1. Spirosomaceae
      1. Flectobacillus
      2. Runella
    2. Spirosoma
    3. Other Genera
      1. Ancyclobacter
      2. Brachyarcus
      3. Cyclobacterium
      4. Meniscus
      5. Microcyclus
      6. Pelosigma
  • Gram-negative Aerobic Rods and Cocci
    1. Pseudomonadaceae
      1. Frateuria
      2. Pseudomonas
      3. Xanthomonas
      4. Zooglea
    2. Azotobacteriaceae
      1. Azomonas
      2. Azotobacter
    3. Rhizobiaceae
      1. Agrobacterium
      2. Bradyrhizobium
      3. Phyllobacterium
      4. Rhizobium
    4. Methylococcaceae
      1. Methylococcus
      2. Methylomonas
    5. Acetobacteraceae
      1. Acetobacter
      2. Gluconobacter
    6. Halobacteriaceae
      1. Halobacterium
      2. Halococcus
    7. Legionellaceae
      1. Legionella
    8. Neisseriaceae
      1. Acinetobacter
      2. Kingella
      3. Moraxella
      4. Neisseria
    9. Other Genera
      1. Acidiphilium
      2. Acidomonas
      3. Acidothermus
      4. Afipia
      5. Agromonas
      6. Alcaligenes
      7. Alteromonas
      8. Aminobacter
      9. Aquaspirillum
      10. Azorhizobium
      11. Beijerinckia
      12. Bordetella
      13. Brucella
      14. Chromohalobacter
      15. Chryseomonas
      16. Comoamonas
      17. Cupriavidas
      18. Deleya
      19. Derxia
      20. Ensifer
      21. Erythrobacter
      22. Flavimonas
      23. Flavobacterium
      24. Francisella
      25. Halomonas
      26. Hydrogenophaga
      27. Janthinobacterium
      28. Lampropedia
      29. Marinobacter
      30. Marinomonas
      31. Mesophilobacter
      32. Methylobacillus
      33. Methylobacterium
      34. Methylophaga
      35. Methylophilus
      36. Methylovorus
      37. Morococcus
      38. Oceanospirillum
      39. Oligella
      40. Paracoccus
      41. Phenylobacterium
      42. Psychrobacter
      43. Rhizobacter
      44. Roseobacter
      45. Rugamonas
      46. Serpens
      47. Sinorhizobium
      48. Sphingobacterium
      49. Thermoleophilum
      50. Thermomicrobium
      51. Thermus
      52. Variovorax
      53. Volcaniella
      54. Weeksella
      55. Xanthobacter
      56. Xylella
      57. Xylophilus
      58. Zoogloea
  • Facultatively Anaerobic Gram-negative Rods
    1. Enterobacteriaceae
      1. Arsenophonus
      2. Budvicia
      3. Buttiauxella
      4. Cedecea
      5. Citrobacter
      6. Edwardsiella
      7. Enterobacter
      8. Erwinia
      9. Escherichia
      10. Ewingella
      11. Hafnia
      12. Klebsiella
      13. Kluyvera
      14. Leclercia
      15. Leminorella
      16. Moellerella
      17. Morganella
      18. Obesumbacterium
      19. Pantoea
      20. Pragia
      21. Proteus
      22. Providencia
      23. Rahnella
      24. Salmonella
      25. Serratia
      26. Shigella
      27. Tatumella
      28. Xenorhabdus
      29. Yersinia
      30. Yokenella
    2. Vibrionaceae
      1. Aeromonas
      2. Enhydrobacter
      3. Photobacterium
      4. Plesiomonas
      5. Vibrio
    3. Pasturellaceae
      1. Actinobacillus
      2. Haemophilus
      3. Pasteurella
    4. Other Genera
      1. Calymmatobacterium
      2. Cardiobacterium
      3. Cedecea
      4. Eikenella
      5. Gardnerella (has thin, Gram-positive walls but stains as negative)
      6. Kluyvera
      7. Obesumbacterium
      8. Rahnella
      9. Streptobacillus
      10. Tatumella
      11. Xenorhabdus
      12. Chromobacterium
      13. Zymomonas
  • Gram-negative Anaerobic, Straight, Curved, and Helical Rods
    1. Bacteroidaceae
      1. Acetivibrio
      2. Acetoanaerobium
      3. Acetofilamentum
      4. Acetogenium
      5. Acetomicrobium
      6. Acetothermus
      7. Acidaminobacter
      8. Anaerobiospirillum
      9. Anaerorhabdus
      10. Anaerovibrio
      11. Bacteroides
      12. Butyrivibrio (has thin, Gram-positive walls but stains as negative)
      13. Centipeda
      14. Fervidobacterium
      15. Fibrobacter
      16. Fusobacterium
      17. Haloanaerobium
      18. Halobacteroides
      19. Ilyobacter
      20. Lachnospira (has thin, Gram-positive walls but stains as negative)
      21. Leptotrichia
      22. Malonomonas
      23. Megamonas
      24. Mitsuokella
      25. Oxalobacter
      26. Pectinatus
      27. Pelobacter
      28. Porphyromonas
      29. Prevotella
      30. Propionigenium
      31. Propionispira
      32. Rikenella
      33. Roseburia
      34. Ruminobacter
      35. Sebaldella
      36. Selenomonas
      37. Sporomusa
      38. Succinimonas
      39. Succinivibrio
      40. Syntrophobacter
      41. Syntrophosmonas
      42. Thermobacteroides
      43. Thermospipho
      44. Thermotoga
      45. Tissierella
      46. Wolinella
      47. Zymophilus
    2. Dissimulatory Sulfate- or Sulfur-Reducing Bacteria
      1. Desulfobacter
      2. Desulfobacterium
      3. Desulfobulbus
      4. Desulfococcus
      5. Desulfomicrobium
      6. Desulfomonas
      7. Desulfomonile
      8. Desulfonema
      9. Desulfosarcina
      10. Desulfotomaculum (also endospore-forming)
      11. Desulfovibrio
      12. Desulfurella
      13. Desulfuromonas
      14. Thermodesulfobacterium
    3. Anaerobic Gram-negaitve Cocci
      1. Veillonellaceae
        1. Acidaminococcus
        2. Megasphaera
        3. Syntrophococcus
        4. Veillonella
  • Rickettsias and Chlamydias
    1. Rickettsiales
      1. Rickettsiaceae
        1. Cowdria
        2. Coxiella
        3. Ehrlichia
        4. Neorickettsia
        5. Rickettsia
        6. Rickettsiella
        7. Rochalimaea
        8. Wolbachia
      2. Bartonellaceae
        1. Bartonella
        2. Grahamella
      3. Anaplasmataceae
        1. Aegyptianella
        2. Anaplasma
        3. Eperythrozoon
        4. Haemobartonella
    2. Chlamydiales
      1. Chlamydiaceae
        1. Chlamydia
  • Mycoplasmas
    1. Mycoplasmataceae
      1. Mycoplasma
      2. Ureaplasma
    2. Acholeplasmataceae
      1. Acholeplasma
    3. Spiroplasmataceae
      1. Spiroplasma
    4. Other Genera
      1. Anaeroplasma
      2. Asteroleplasma
      3. Thermoplasma
  • Endosymbionts
    1. Endosymbionts of Protozoa
      1. Caedibacter
      2. Holospora
      3. Lyticum
      4. Pseudocaedibacter
      5. Tectibacter
    2. Endosymbionts of Insects (blood sucking, plant sap-sucking, cellulose and stored grain feeders, and insects feeding on complex diets
      1. Blattabacterium
    3. Endosymbionts of Fungi and Invertebrates other than Arthropods (Fungi, Sponges, Coelenterates, Helminthes, Annelids, Marine worms and mollusks
    4. Endosymbionts of Protozoa, ciliates, flagellates, and amoebas
      1. Caedibacter
      2. Holospora
      3. Lyticum
      4. Pseudocaedibacter
      5. Tectibacter
    5. Endosymbionts of Insects (blood sucking, plant sap-sucking, cellulose and stored grain feeders, and insects feeding on complex diets
      1. Blattabacterium
    6. Endosymbionts of Fungi and Invertebrates other than Arthropods (Fungi, Sponges, Coelenterates, Helminthes, Annelids, Marine worms and mollusks
    7. Endosymbionts of Protozoa, ciliates, flagellates, and amoebas
      1. Caedibacter
      2. Holospora
      3. Lyticum
      4. Pseudocaedibacter
      5. Tectibacter
  • Mycobacteria
    1. Mycobacteriaceae
      1. Mycobacterium
  • Nocardioforms
    Intrasporangium
    Micropolyspora
    Nocardia
    Nocardioides
    Oerskovia
    Promicromonospora
    Pseudonocardia
    Rhodococcus
    Saccharopolyspora
  • Anoxygenic Phototrophic Bacteria
    1. Purple Sulfur Bacteria: Internal Sulfur Granules
      1. Chromatiaceae
        1. Amoebobacter
        2. Chromatium
        3. Lamprobacter
        4. Lamprocystis
        5. Thiocapsa
        6. Thiocystis
        7. Thiodictyon
        8. Thiopedia
        9. Thiospirillum
    2. Purple Sulfur Bacteria: External Sulfur Granules
      1. Ectothiorhodospiraceae
        1. Ectothiorhodopsin
        2. Ectothiorhodospira
    3. Purple Nonsulfur Bacteria
      1. Rhodobacter
      2. Rhodyclus
      3. Rhodomicrobium
      4. Rhodopila
      5. Rhodopseudomonas
      6. Rhodospirillum
    4. Green Nonsulfur Bacteria
      1. Heliobacillus
      2. Heliobacterium
    5. Green Sulfur Bacteria
      1. Anacalochloris
      2. Chlorobium
      3. Chloroherpeton
      4. Pelodictyon
      5. Prosthecochloris
    6. Multicellular Filamentous Green Bacteria
      1. Chloroflexus
      2. Chloronema
      3. Heliothrix
      4. Oscillochloris
    7. Anaerobic Chemotrophic Bacteria
      1. Erythrobacter
  • Oxygenic Phototrophic Bacteria
    1. Cyanobacteria
      1. Chroococcales
        1. Chamaespiphon
        2. Cyanothece
        3. Gloeobacter
        4. Gloeocapsa
        5. Gloethece
        6. Microcystis
        7. Myxobaktron
        8. Synechococcus
        9. Synechocystis
      2. Pleurocapsales
        1. Chroococcidiopsis
        2. Dermocarpa
        3. Dermocarpella
        4. Myxosarcina
        5. Pleurocapsa
        6. Xenococcus
      3. Oscillatoriales
      4. Arthrospira
      5. Crinalium
      6. Lyngbya
      7. Microcoleus
      8. Oscillatoria
      9. Pseudanabaena
      10. Spirulina
      11. Starria
      12. Trichodesmium
    2. Nostocales
      1. Nostocaceae
        1. Anabaena
        2. Aphanizomenon
        3. Cylindrospermum
        4. Nodularia
        5. Nostoc
      2. Scytonemataceae
        1. Scytonema
      3. Rivulariaceae
        1. Calothrix
    3. Stigonematales
      1. Chlorogloeopsis
      2. Fischerella
      3. Geitleria
      4. Stigonema
    4. Prochlorales
      1. Prochloraceae
        1. Prochloron
        2. Prochlorothrix
  • Aerobic Chemolithotrophic Bacteria and Associated Organisms
    1. Nitrifying Bacteria
      1. Nitrobacteraceae
    2. Nitrate-oxidizing bacteria
      1. Nitrobacter
      2. Nitrococcus
      3. Nitrospina
      4. Nitrospira
    3. Ammonia-oxidizing bacteria
      1. Nitrosococcus
      2. Nitrosolobus
      3. Nitrosomonas
      4. Nitrosospira
      5. Nitrosovibrio
    4. Colorless sulfur-oxidizing bacteria
      1. Acidiphilium
      2. Macromonas
      3. Thermothrix
      4. Thiobacillus
      5. Thiobacterium
      6. Thiodendron
      7. Thiomicrospira
      8. Thiosphaera
      9. Thiospira
      10. Thiovulum
    5. Obligate Chemolithotrophic Hydrogen Bacteria
      1. Hydrogenobacter
    6. Iron- and Manganese-oxidizing and/or -Depositing Bacteria
      1. Siderocapsaceae
        1. Aquaspirillum
        2. Bilophococcus
        3. Gallionella (both iron-oxidizing and appendaged)
        4. Leptospirillum
        5. Metallogenium
        6. Naumaniella
        7. Ochrobium
        8. Siderocapsa
        9. Siderococcus
        10. Sulfobacillus
    7. Budding and/or Appendaged Bacteria
      (Appendaged Bacteria are indicatated by *)
      1. Prosthecate Bacteria
        1. Ancalomicrobium
        2. Asticcacaulus*
        3. Caulobacter*
        4. Dichotomicrobium*
        5. Filomicrobium*
        6. Hirschia
        7. Hyphomicrobium*
        8. Hyphomonas*
        9. Labrys
        10. Pedomicrobium
        11. Prosthecobacter*
        12. Prosthecomicrobium
        13. Stella
        14. Verrucomicrobium*
      2. Planctomycetales
        1. Gemmata
        2. Pirelulla
      3. Non prosthecate Budding Bacteria
        1. Angulomicrobium
        2. Blastobacter
        3. Ensifer
        4. Gemmiger
        5. Isosphaera
        6. 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
    1. Single-celled, Rod-shaped Gliding Bacteria
      1. Cytophagales
        1. Cytophagaceae
          1. Capnocytophaga
          2. Chitinophaga
          3. Cytophaga
          4. Flexibacter
          5. Flexithrix
          6. Microscilla
          7. Sporocytophaga
          8. Thermonema
      2. Lysobacterales
        1. Lysobacteriaceae
          1. Lysobacter
    2. Flattened, Filamentous Gliding Bacteria
      1. Simonsiellaceae
        1. Alysiella
        2. Simonsiella
    3. Sulfur-Oxidizing Gliding Bacteria
      1. Beggiatoales
        1. Beggiatoaceae
          1. Achromatium
          2. Beggiatoa
          3. Thioploca
          4. Thiospirillopsis
          5. Thiothrix
    4. The Pelonemas
      1. Pelonemataceae
        1. Achroonema
        2. Desmanthus
        3. Pelonema
        4. Peloploca
      2. Other Genera
        1. Agitococcus
        2. Desulfonema
        3. Herpetosiphon
        4. Isosphaera
        5. Leucothrix
        6. Saprospira
        7. Toxothrix
        8. Vitreoscilla
  • Gliding, Fruiting Bacteria
    1. Archangiaceae
      1. Archangium
    2. Cystobacteraceae
      1. Cystobacter
      2. Melittangium
      3. Stigmatella
    3. Myxococcales
      1. Myxococcaceae
        1. Myxococcus
      2. Polyangiaceae
        1. Chondromyces
        2. Nannocystis
        3. Polyangium
      3. Other Genera
        1. Angiococcus
        2. Corallococcus
        3. Haploangium
        4. Sorangium
You will find there are many reference journals as well as books that will provide you with further information related to scientific classification of bacteria. Hope the above paragraphs have helped solved some of your queries and doubts related to bacterial classification.
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Last Updated: September 30, 2011
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