Prokaryotes 

Bergey's Manual organizes prokaryotes into two domains (Archaea and Bacteria), each of which is further divided into 23 phyla and numerous classes, orders, families, and genera. The outline below lists representative genera from all currently accepted families. On this page, genera are grouped by Phylum (named), Class (named), Order  and Family. Arabic numerals indicate genera belonging to different orders (numeral before the period) and families (numeral after the period). Letters a, b, c...are used when more than one genus is listed to represent its family.  Parenthesis: number of genera in this family, including the genus listed.  An Alphabetical Index of genera is also provided. 

Domain Archaea

I. Phylum Crenarchaeota

I. Class Thermoprotei

• 1.1 Thermoproteus (4)
• 1.2 Thermofilum (1)
• 2.1 Desulfurococcus (9)
• 2.2 Pyrodictium (3)
• 3.1 Sulfolobus (6)

II. Phylum Euryarchaeota

I. Class Methanobacteria

•     1.1.a Methanobacterium
•     1.1.b Methanobrevibacter
•     1.1.c Methanosphaera
•     1.1.d Methanothermobacter
•     1.2 Methanothermus

II. Class Methanococci

• 1.1.a Methanococcus
• 1.1.b Methanothermococcus
• 1.2.a Methanocaldococcus
• 1.2.b Methanotorris
• 2.1 Methanomicrobium
• 2.2 Methanocorpuscelum
• 2.3 Methanospirillum 
• 3.1 Methanosarcina
• 3.2 Methanosaeta

III. Class Halobacteria

• 1.1 Halobacterium

IV. Class Thermoplasmata

• 1.1 Thermoplasma
• 1.2 Picrophilus
• 1.3 Ferroplasma

V. Class Thermococci

• 1.1 a Thermococcus
• 1.1b Pyrococcus

VI. Class Archaeoglobi

• 1.1 Archaeoglobus

VII. Class Methanopyri

• 1.1 Methanopyrus

III. Phylum Nanoarchaeota

• 1.1 Nanoarchaeum equitans

IV. Phylum Korarchaeota

Domain Bacteria

I. Phylum Aquificae

I. Class Aquificae

• 1.1.a Aquifex 
• 1.1.b Hydrogenobacter

II. Phylum Thermotogae

I. Class Thermotogae

• 1.1 Thermotoga

III. Phylum Thermodesulfobacteria

I. Class Thermodesulfobacteria

• 1.1 Thermodesulfobacterium

IV. Phylum "Deinococus - Thermus"

I. Class Deinococci

• 1.1 Deinococcus
• 2.1 Thermus

V. Phylum Chrysiogenetes

I. Class Chrysiogenetes

• 1.1 Chrysiogenes

VI. Phylum Chloroflexi

I. Class "Chloroflexi"

• 1.1 Chloroflexus
• 1.2 Oscillochloris
• 2.1 Herpetosiphon

VII. Phylum Thermomicrobia

I. Class Thermomicrobia

• 1.1 Thermomicrobium

VIII. Phylum Nitrospira

I. Class "Nitrospira"

• 1.1.a Nitrospira

• 1.1.b Leptospirillum
• 1.1.c Magnetobacterium
• 1.1.d Thermodesulfovibrio

IX. Phylum Deferribacteres

I. Class Deferribacteres

• 1.1.a Deferribacteres

• 1.1.b Geovibrio

X. Phylum Cyanobacteria

I. Class "Cyanobacteria"

• 1.1.a Chroococcus
• 1.1.b Gloeobacter
• 1.1.c Mycrocystis
• 1.1.d Prochloron
• 2.1 Cyanocystis
• 2.2 Pleurocapsa
• 3.1 Oscillatoria
• 4.1.a Anabaena
• 4.1.b Nostoc
• 4.2 Calothrix
• 5.1 Fischerella

XI. Phylum Chlorobia

I. Class Chlorobia

• 1.1 Chlorobium

XII. Phylum Proteobacteria

I. Class a-Proteobacteria

• 1.1 Rhodospirillum
• 1.2 Acetobacter
• 2.1 Rickettsia
• 2.2 Ehrlichia
• 2.3 Holospora
• 3.1 Rhodobacter
• 4.1.a Sphingomonas
• 4.1.b Zymomonas
• 5.1 Caulobacter
• 6.1 Rhizobium
• 6.2 Bartonella
• 6.3 Brucella
• 6.4 Phyllobacterium
• 6.5 Methylocystis
• 6.6 Beijerinckia
• 6.7 Nitrobacter
• 6.8 Hyphomicrobium
• 6.9 Methylobacterium
• 6.10 Rhodobium

II. Class b-Proteobacteria

• 1.1 Burkholderia
• 1.2 Ralstonia
• 1.3 Oxalobacter
• 1.4 Bordetella
• 1.5.a Leptothrix
• 1.5.b Sphaerotilus
• 2.1 Thiobacillus
• 3.1 Methylobacillus
• 4.1 Neisseria
• 5.1 Nitrosomonas
• 5.2 Spirillum
• 5.3 Gallionella
• 6.1 Propionibacter

III. Class g-Proteobacteria

• 1.1. Chromatium vinosum

• 1.2. Ectothiorhodospira

• 2.1 Acidithiobacillus

• 3.1 Xanthomonas

• 4.1 Cardiobacterium
• 5.1a. Thiomargarita
• 5.1.b. Beggiatoa
• 5.1.c. Leucothrix mucor

• 6.1. Legionella

• 6.2. Coxiella

• 7.1 Methylococcus

• 8.1. Oceanospirillum

• 8.2. Halomonas

• 9.1.a Pseudomonas

• 9.1.b Azotobacter

• 9.2. Moraxella
• 10.1 Alteromonas
• 11.1.a. Vibrio cholerae

• 11.1.b. Photobacterium

• 12.1. Aeromonas
• 12.2. Ruminobacter
• 13.1.a. Escherichia 
• 131.1b. Enterobacter
• 13.1.c. Citrobacter
• 13.1.d. Edwardsiella
• 13.1.e. Erwinia
• 13.1.f. Klebsiella
• 13.1.g. Proteus
• 13.1.h. Providencia
• 13.1.i. Salmonella
• 13.1.j. Serratia
• 13.1.k. Shigella
• 13.1.l. Yersinia 
• 14.1 Haemophilus ducreyi 

IV. Class d-Proteobacteria

• 1.1 Desulfurella
• 2.1. Desulfovibrio
• 2.2 Desulfomicrobium
• 2.3 Desulfohalobium
• 2.4 Desulfonatronum
• 3.1 Desulfobacter
• 3.2 Desulfobulbus
• 3.3 Nitrospina
• 4.1 Desulfuromonas
• 4.2 Geobacter
• 4.3 Pelobacter
• 5.1 Syntrophobacter
• 5.2 Syntrophus
• 6.1 Bdellovibrio
• 7.1 Myxococcus
• 7.2 Archangium
• 7.3. Stigmatella
• 7.4 Polyangium 

V. Class e-Proteobacteria

• 1.1 Campylobacter
• 1.2. Helicobacter

XIII. Phylum Firmicutes

I. Class "Clostridia"

• 1.1.a Clostridium
• 1.1.b Epulopiscium
• 1.2.a Lachnospira
• 1.2.b Ruminococcus
• 1.3. Peptostreptococcus
• 1.4. Eubacterium
• 1.5. Peptococcus
• 1.6. Heliobacterium
• 1.7.a Acidaminococcus
• 1.7.b Quniella
• 1.7.c Veillonella
• 1.8 Syntrophomonas
• 2.1 Thermoanaerobacterium
• 3.1. Haloanaerobium
• 3.2. Halobacteroides

II. Class Mollicutes

• 1.1.a Mycoplasma
• 1.1.b Ureaplasma
• 2.1. Entomoplasma
• 2.2. Spiroplasma
• 3.1 Acholeplasma
• 4.1 Anaeroplasma
• 5.1 Erysipelothrix

III. Class "Bacilli"

• 1.1 Bacillus
• 1.2.a Planococcus
• 1.2.b Kurthia
• 1.2.c Sporosarcina
• 1.3 Caryophanon
• 1.4 Listeria
• 1.5 Staphylococcus
• 1.6 Sporolactobacillus
• 1.7 Paenibacillus
• 1.8 Alicyclobacillus
• 1.9 Thermoactinomyces
• 2.1 Lactobacillus
• 2.2 Aerococcus
• 2.3 Carnobacterium
• 2.4 Enterococcus
• 2.5.a Leuconostoc 
• 2.5.b Oenococcus
• 2.6.a Streptococcus
• 2.6.b Lactococcus

XIV. Phylum Actinobacteria

I. Class Actinobacteria

Subclass Acidimicrobidae

• 1.1 Acidimicrobium (1)

Subclass Rubrubacteridae

• 2.1 Rubrobacter (1)

Subclass Coriobacteridae

• 3.1 Coriobacterium (7)

Subclass Sphaerobacteridae

• 4.1 Sphaerobacter (1)

Subclass Actinobacteridae

Order Actinomycetales

• 5.1 Actinomyces (4)
• 6.1.a Micrococcus (7)
• 6.1.b Arthrobacter 
• 6.2 Bogoriella (1)
• 6.3 Rarobacter (1)
• 6.4 Sanguibacter (1)
• 6.5 Brevibacterium (1)
• 6.6 Cellulomonas (2)
• 6.7 Dermabacter (2)
• 6.8 Dermatophilus (1)
• 6.9 Dermacoccus (3)
• 6.10 Intrasporangium (7)
• 6.11 Jonesia (1)
• 6.12 Microbacterium (12)
• 6.13 Beutenbergia (1)
• 6.14 Promicromonospora (1)
• 7.1 Corynebacterium (1)
• 7.2 Dietzia (1)
• 7.3 Gordonia (2)
• 7.4 Mycobacterium (1)
• 7.5 Nocardia (2)
• 7.6 Tsukamurella (1)
• 7.7 Williamsia (1)
• 8.1 Actinoplanes (9)
• 9.1 Propionibacterium (5)
• 9.2 Nocardioides (7)
• 10.1 Pseudonocardia (12)
• 10.2 Actinosynnema (4)
• 11.1 Streptomyces (3)
• 12.1 Streptosporangium (10)
• 12.2 Nocardiopsis (2)
• 12.3 Thermomonospora (3)
• 13.1 Frankia (1)
• 13.2 Geodermatophilus (3)
• 13.3 Microsphaera (1)
• 13.4 Sporichthya (1)
• 13.5 Acidothermus (1)
• 13.6 Kineosporia (3)
• 14.1 Glyomyces (1)

Order Bifidobacteriales

• 1. Bifidobacterium (3)
• 2. Actinobispora (5)

(138 genera in 44 families, 14 suborders, 6 orders, 5 subclasses and 1 class)

XV. Phylum Planctomycetes

I. Class "Planctomycetacia"

• 1.1 Planctomyces (4)

(4 genera in 1 family, 1 order, 1 class)

XVI. Phylum Chlamydiae

I. Class "Chlamydiae"

• 1.1 Chlamydia (2)
• 1.2 Parachlamydia (1)
• 1.3 Symkania (1)
• 1.4 Waddlia (1)

(5 genera in 4 families, 1 order, 1 class)

XVII. Phylum Spirochaetes

I. Class "Spirochaetes"

• 1.1.a Spirochaeta (9)
• 1.1.b Borrelia
• 1.1.c Treponema
• 1.2 Serpulina (2)
• 1.3 Leptospira (2)

(13 genera in 3 families, 1 order, 1 class)

XVIII. Phylum Fibrobacteres

I. Class "Fibrobacteres"

• 1.1 Fibrobacter (1)

(1 genus in 1 family, 1 order, 1 class)

XIX. Phylum Acidobacteria

I. Class "Acidobacteria"

• 1.1 Acidobacterium (3)

(3 genera in 1 family, 1 order, 1 class)

XX. Phylum Bacteroidetes

I. Class "Bacteroidetes"

• 1.1. Bacteroides (6)
• 1.2. Rikenella (2)
• 1.3. Porphyromonas (2)
• 1.4. Prevotella (1)

II. Class "Flavobacteria"

• 1.1. Flavobacterium (15)
• 1.2. Psychromonas (2)
• 1.3. Blattabacterium (1)

III. Class "Sphingobacteria"

• 1.1.Sphingobacterium (2)
• 1.2. Saprospira (3)
• 1.3. Cytophaga (11)
• 1.4. Flammeovirga (4)
• 1.5. Crenothrix (4)

(53 genera in 12 families, 3 orders, 3 classes)

XXI. Phylum Fusobacteria

I. Class "Fusobacteria"

• 1.1 Fusobacterium (6)
• 1.2 Cetobacterium (1)

(7 genera in 2 families, 1 order, 1 class)

XXII. Phylum Verrucomicrobia

I. Class Verrucomicrobiae

• 1.1 Verrucomicrobium (2)
• 1.2 Xiphinematobacter (1)

(3 genera in 2 families, 1 order, 1 class)

XXIII. Phylum Dictyoglomus

I. Class "Dictyoglomi"

• 1.1 Dictyoglomus (1)

(1 genus in 1 family, 1 order, 1 class)

* Bergey's Manual^® of Systematic Bacteriology, 2nd edition

This page was last edited on 12/15/06 .

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