This article lists the genera of the Archaea

Archaea

The Archaea are a group of single-celled microorganisms. A single individual or species from this domain is called an archaeon...

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The following genus of the Archaea has not been assigned to a phylum:

• Genus Halostagnicola
  Halostagnicola
  In taxonomy, Halostagnicola is a genus of the Archaea.-External links:...
  
  

Phylum Crenarchaeota

This section lists the genera of Archaea within the Phylum Crenarchaeota

Crenarchaeota

In taxonomy, the Crenarchaeota has been classified as either a phylum of the Archaea kingdom or a kingdom of its own...

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Class Thermoprotei

This section lists the genera of Archaea within the Class

Class (biology)

In biological classification, class is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order...

 Thermoprotei

Thermoprotei

In taxonomy, the Thermoprotei are a class of the Crenarchaeota .-External links:...

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Order Caldisphaerales

This section lists the genera of Archaea within the Order

Order (biology)

In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...

 Caldisphaerales

Caldisphaerales

In taxonomy, the Acidilobales are an order of the Thermoprotei.-External links:...

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Family Caldisphaeraceae

This section lists the genera of Archaea within the Family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Caldisphaeraceae

Caldisphaeraceae

In taxonomy, the Caldisphaeraceae are a family of the Acidilobales.-External links:...

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• Genus Caldisphaera
  Caldisphaera
  In taxonomy, Caldisphaera is a genus of the Caldisphaeraceae.-External links:...
  
  

Order Cenarchaeales

This section lists the genera of Archaea within the Order Cenarchaeales

Cenarchaeales

In taxonomy, the Cenarchaeales are an order of the Thermoprotei.-External links:...

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Family Cenarchaeaceae

This section lists the genera of Archaea within the Family Cenarchaeaceae

Cenarchaeaceae

In taxonomy, the Cenarchaeaceae are a family of the Cenarchaeales.-External links:...

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• Genus Cenarchaeum
  Cenarchaeum
  In taxonomy, Cenarchaeum is a genus of the Cenarchaeaceae. The marine archaean Cenarchaeum symbiosum lives within the sponge Axinella mexicana.-External links:...
  
  

Order Desulfurococcales

This section lists the genera of Archaea within the Order Desulfurococcales

Desulfurococcales

In taxonomy, the Desulfurococcales are an order of the Thermoprotei.-External links:...

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The following two genera of the Desulfurococcales have not been assigned to a family:

• Genus Caldococcus
  Caldococcus
  In taxonomy, Caldococcus is a genus of the Desulfurococcales.-External links:...
  
  
• Genus Ignisphaera
  Ignisphaera
  In taxonomy, Ignisphaera is a genus of the Desulfurococcales.-External links:...
  
  

Family Desulfurococcaceae

This section lists the genera of Archaea within the Family Desulfurococcaceae

Desulfurococcaceae

In taxonomy, the Desulfurococcaceae are a family of the disc-shaped anaerobic microorganisms belonging to the order Desulfurococcales, in the domain Archaea. Members of this family are distinguished from the other family in the order Desulfurococcales by having an optimal growth temperature below...

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• Genus Acidilobus
  Acidilobus
  In taxonomy, Acidilobus is a genus of the Acidilobaceae.-External links:...
  
  
• Genus Acidococcus
  Acidococcus
  In taxonomy, Acidococcus is a genus of the Desulfurococcaceae.-External links:...
  
  
• Genus Aeropyrum
  Aeropyrum
  In taxonomy, Aeropyrum is a genus of the Desulfurococcaceae.-Etymology:The name Aeropyrum derives from:Greek noun aer, aeros , air; Greek neuter gender noun pur, fire; New Latin neuter gender noun Aeropyrum, air fire, referring to the hyperthermophilic respirative character of the...
  
  
• Genus Desulfurococcus
  Desulfurococcus
  In taxonomy, Desulfurococcus is a genus of the Desulfurococcaceae.-External links:...
  
  
• Genus Ignicoccus
  Ignicoccus
  Ignicoccus is a genus of Archaea living in marine hydrothermal vents. They were discovered in Kolbeinsey Ridge north of Iceland and in the Pacific Ocean in 2000 .-Systematics:...
  
  
• Genus Staphylothermus
  Staphylothermus
  In taxonomy, Staphylothermus is a genus of the Desulfurococcaceae.-External links:...
  
  
• Genus Stetteria
  Stetteria
  In taxonomy, Stetteria is a genus of the Desulfurococcaceae.-External links:...
  
  
• Genus Sulfophobococcus
  Sulfophobococcus
  In taxonomy, Sulfophobococcus is a genus of the Desulfurococcaceae.-External links:...
  
  
• Genus Thermodiscus
  Thermodiscus
  In taxonomy, Thermodiscus is a genus of the Desulfurococcaceae.-External links:...
  
  
• Genus Thermosphaera
  Thermosphaera
  In taxonomy, Thermosphaera is a genus of the Desulfurococcaceae.The Thermosphaera are a group of prokaryotic organisms which have been discovered in extremely hot environments such as sulfur springs, volcanoes, and magma pools...
  
  

Family Pyrodictiaceae

This section lists the genera of Archaea within the Family Pyrodictiaceae

Pyrodictiaceae

The Pyrodictiaceae are a family of disc-shaped anaerobic microorganisms belonging to the order Desulfurococcales, in the domain Archaea. Members of this family are distinguished from the other family in the order Desulfurococcales by having an optimal growth temperature above 100 degrees °C,...

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• Genus Geogemma
  Geogemma
  In taxonomy, Geogemma is a genus of the family Pyrodictiaceae.-External links:...
  
  
• Genus Hyperthermus
  Hyperthermus
  In taxonomy, Hyperthermus is a genus of the Pyrodictiaceae.-External links:...
  
  
• Genus Pyrodictium
  Pyrodictium
  In taxonomy, Pyrodictium is a genus of the Pyrodictiaceae.Pyrodictium is a genera of submarine hyperthrmophilic archaea whose optimal growth temperature ranges is 80 to 105 °C. They have a unique cell structure involving a network of cannulae and flat, disk-shaped cells...
  
  
• Genus Pyrolobus
  Pyrolobus
  Pyrolobus is a genus of the Pyrodictiaceae.-External links:...
  
  

Order Nitrosopumilales

This section lists the genera of Archaea within the Order Nitrosopumilales

Nitrosopumilales

In taxonomy, the Nitrosopumilales are an order of the Thermoprotei.-External links:...

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Family Nitrosopumilaceae

This section lists the genera of Archaea within the Family Nitrosopumilaceae

Nitrosopumilaceae

In taxonomy, the Nitrosopumilaceae are a family of the Nitrosopumilales.-External links:...

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• Genus Nitrosopumilus
  Nitrosopumilus
  Nitrosopumilus maritimus is an extremely common archaeon living in seawater. It is the first member of the Group 1a Crenarchaeota to be isolated in pure culture. Gene sequences suggest that the Group 1a Crenarchaeota are ubiquitous with the oligotrophic surface ocean and can be found in most...
  
  (candidatus)

Order Sulfolobales

This section lists the genera of Archaea within the Order Sulfolobales

Sulfolobales

In taxonomy, the Sulfolobales are an order of the Thermoprotei.- External links :...

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Family Sulfolobaceae

This section lists the genera of Archaea within the Family Sulfolobaceae

Sulfolobaceae

In taxonomy, the Sulfolobaceae are a family of the Sulfolobales.-External links:...

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• Genus Acidianus
  Acidianus
  In taxonomy, Acidianus is a genus of the Sulfolobaceae.-External links:...
  
  
• Genus Metallosphaera
  Metallosphaera
  In taxonomy, Metallosphaera is a genus of the Sulfolobaceae.-External links:...
  
  
• Genus Stygiolobus
  Stygiolobus
  In taxonomy, Stygiolobus is a genus of the Sulfolobaceae.-External links:...
  
  
• Genus Sulfolobus
  Sulfolobus
  Sulfolobus is a genus of microorganism in the family Sulfolobaceae. It belongs to the archea domain.Sulfolobus species grow in volcanic springs with optimal growth occurring at pH 2-3 and temperatures of 75-80 °C, making them acidophiles and thermophiles respectively...
  
  
• Genus Sulfurisphaera
  Sulfurisphaera
  In taxonomy, Sulfurisphaera is a genus of the Sulfolobaceae.- Description and significance :Sulfurisphaera is facultatively anaerobic, thermophilic, Gram-negative archaeon that occur in acidic solfataric fields. The organism grows under the temperature range of 63-92°C with the optimum temperature...
  
  

Order Thermoproteales

This section lists the genera of Archaea within the Order Thermoproteales

Thermoproteales

In taxonomy, the Thermoproteales are an order of the Thermoprotei.-External links:...

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Family Thermofilaceae

This section lists the genera of Archaea within the Family Thermofilaceae

Thermofilaceae

In taxonomy, the Thermofilaceae are a family of the Thermoproteales.-External links:...

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• Genus Thermofilum
  Thermofilum
  In taxonomy, Thermofilum is a genus of the Thermofilaceae.-External links:...
  
  

Family Thermoproteaceae

This section lists the genera of Archaea within the Family Thermoproteaceae

Thermoproteaceae

In taxonomy, the Thermoproteaceae are a family of the Thermoproteales.-External links:...

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• Genus Caldivirga
  Caldivirga
  In taxonomy, Caldivirga is a genus of the Thermoproteaceae.-External links:...
  
  
• Genus Pyrobaculum
  Pyrobaculum
  In taxonomy, Pyrobaculum is a genus of the Thermoproteaceae.- Description and Significance :As its latin name, Pyrobaculum suggests, the archaeon is rod-shaped and isolated from locations with high temperatures. It is Gram-negative and its cells are surrounded by an S-layer of protein subunits.P...
  
  
• Genus Thermocladium
  Thermocladium
  In taxonomy, Thermocladium is a genus of the Thermoproteaceae.-External links:...
  
  
• Genus Thermoproteus
  Thermoproteus
  In taxonomy, Thermoproteus is a genus of the Thermoproteaceae.These prokaryotes are thermophilic sulphur-dependent organisms related to the genera Sulfolobus, Pyrodictium and Desulfurococcus...
  
  
• Genus Vulcanisaeta
  Vulcanisaeta
  In taxonomy, Vulcanisaeta is a genus of the Thermoproteaceae.- Description and significance :Vulcanisaeta is an anaerobic, heterotrophic, hyperthermophilic archaeon that grows optimally at 85-90°C and at pH 4.0-4.5...
  
  

Phylum Euryarchaeota

This section lists the genera of Archaea within the Phylum Euryarchaeota

Euryarchaeota

In the taxonomy of microorganisms, the Euryarchaeota are a phylum of the Archaea.The Euryarchaeota include the methanogens, which produce methane and are often found in intestines, the halobacteria, which survive extreme concentrations of salt, and some extremely thermophilic aerobes and anaerobes...

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The following genus of the Euryarchaeota has not been assigned to a class:

• Genus Aciduliprofundum
  Aciduliprofundum
  In taxonomy, Aciduliprofundum is a genus of the Euryarchaeota.-External links:...
  
  

Class Archaeoglobi

This section lists the genera of Archaea within the Class Archaeoglobi

Archaeoglobi

In taxonomy, the Archaeoglobi are a class of the Euryarchaeota.-External links:...

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Order Archaeoglobales

This section lists the genera of Archaea within the Order Archaeoglobales

Archaeoglobales

In taxonomy, the Archaeoglobales are an order of the Archaeoglobi.-External links:...

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Family Archaeoglobaceae

This section lists the genera of Archaea within the Family Archaeoglobaceae

Archaeoglobaceae

In taxonomy, the Archaeoglobaceae are a family of the Archaeoglobales. All known genera within the Archaeoglobaceae are hyperthermophilic and can be found near undersea hydrothermal vents.- Mode of Metabolism :...

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• Genus Archaeoglobus
  Archaeoglobus
  Archaeoglobus is a genus of the phylum Euryarchaeota. Archaeoglobus can be found in high-temperature oil fields where they may contribute to oil field souring.- Metabolism :...
  
  
• Genus Ferroglobus
  Ferroglobus
  In taxonomy, Ferroglobus is a genus of the Archaeoglobaceae.Ferroglobus is a hyperthermophilic genus phylogenetically located within the Euryarchaeota. It consists of one species, F. placidus, isolated from hydrothermal vent sediment off the coast of Italy. F. placidus grows best at 85°C and a...
  
  
• Genus Geoglobus
  Geoglobus
  Geoglobus is a hyperthermophilic member of the Archaeoglobaceae within the Euryarchaeota. It consists of one species, G. ahangari, isolated from the Guaymas Basin hydrothermal system located deep within the Gulf of California. As a hyperthermophile, it grows best at a temperature of 88°C and cannot...
  
  

Class Halobacteria

This section lists the genera of Archaea within the Class Halobacteria

Halobacteria

In taxonomy, the Halobacteria are a class of the Euryarchaeota, found in water saturated or nearly saturated with salt. They are also called halophiles, though this name is also used for other organisms which live in somewhat less concentrated salt water...

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Order Halobacteriales

This section lists the genera of Archaea within the Order Halobacteriales

Halobacteriales

In taxonomy, the Halobacteriales are an order of the Halobacteria, found in water saturated or nearly saturated with salt. They are also called halophiles, though this name is also used for other organisms which live in somewhat less concentrated salt water. They are common in most environments...

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Family Halobacteriaceae

This section lists the genera of Archaea within the Family Halobacteriaceae

Halobacteriaceae

In taxonomy, the Halobacteriaceae are a family of the Halobacteriales in the domain Archaea.- Overview :Halobacteriaceae are found in water saturated or nearly saturated with salt. They are also called halophiles, though this name is also used for other organisms which live in somewhat less...

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• Genus Haladaptatus
  Haladaptatus
  In taxonomy, Haladaptatus is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Halalkalicoccus
  Halalkalicoccus
  In taxonomy, Halalkalicoccus is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Haloalcalophilium
  Haloalcalophilium
  In taxonomy, Haloalcalophilium is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Haloarcula
  Haloarcula
  In taxonomy, Haloarcula is a genus of the Halobacteriaceae.- Description and Significance :Haloarcula are extreme halophilic archaeons. They are distinguished from other genera in the Halobacteriaceae family by the presence of specific derivatives of TGD-2 polar lipids...
  
  
• Genus Halobacterium
  Halobacterium
  In taxonomy, Halobacterium is a genus of the Halobacteriaceae.The genus Halobacterium consists of several species of archaea with an aerobic metabolism which require an environment with a high concentration of salt; many of their proteins will not function in low-salt environments. They grow on...
  
  
• Genus Halobaculum
  Halobaculum
  In taxonomy, Halobaculum is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Halobiforma
  Halobiforma
  In taxonomy, Halobiforma is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Halococcus
  Halococcus
  Halococcus is a genus of the Halobacteriaceae.- Description and Significance :Halococcus is a genus of extreme halophilic archaea, meaning that they require high salt levels, sometimes as high as 32% NaCl, for optimal growth...
  
  
• Genus Haloferax
  Haloferax
  In taxonomy, Haloferax is a genus of the Halobacteriaceae.- Description and Significance :Haloferax volcanii is a species of halophile which exists in extreme saline environments. Recently an isolate of this species was studied by researchers at University of California-Berkeley as part of a...
  
  
• Genus Halogeometricum
  Halogeometricum
  In taxonomy, Halogeometricum is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Halomicrobium
  Halomicrobium
  In taxonomy, Halomicrobium is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Halopiger
  Halopiger
  In taxonomy, Halopiger is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Haloplanus
  Haloplanus
  In taxonomy, Haloplanus is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Haloquadra
  Haloquadra
  Haloquadratum is a genus of the family Halobacteriaceae. The first species to be identified in this group, Haloquadratum walsbyi, is highly unusual since its cells are shaped like flat, square boxes....
  
  
• Genus Halorhabdus
  Halorhabdus
  In taxonomy, Halorhabdus is a genus of the Halobacteriaceae.- Description and significance :Halorhabdus utahensis is a motile, Gram-negative, extremely halophilic archaeon that forms red, circular colonies. It grows at the temperatures between 17 and 55 °C, with optimal growth occurring at 50°C...
  
  
• Genus Halorubrum
  Halorubrum
  In taxonomy, Halorubrum is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Halosarcina
  Halosarcina
  In taxonomy, Halosarcina is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Halosimplex
  Halosimplex
  In taxonomy, Halosimplex is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Haloterrigena
  Haloterrigena
  In taxonomy, Haloterrigena is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Halovivax
  Halovivax
  In taxonomy, Halovivax is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Natrialba
  Natrialba
  In taxonomy, Natrialba is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Natrinema
  Natrinema
  In taxonomy, Natrinema is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Natronobacterium
  Natronobacterium
  In taxonomy, Natronobacterium is a genus of the Halobacteriaceae. A member of the domain Archaea, it is both an extreme halophile and alkaliphile, thriving at an optimum saline concentration of 20% and optimum pH of 10.-Scientific books:...
  
  
• Genus Natronococcus
  Natronococcus
  In taxonomy, Natronococcus is a genus of the Halobacteriaceae.- Description and significance :This haloalkaliphilic archaeon is in the same family as microorganisms like Halobacterium...
  
  
• Genus Natronolimnobius
  Natronolimnobius
  In taxonomy, Natronolimnobius is a genus of the Halobacteriaceae.-External links:...
  
  
• Genus Natronomonas
  Natronomonas
  In taxonomy, Natronomonas is a genus of the Halobacteriaceae.- Description and Significance :Natronomonas pharaonis is an aerobic, extremely haloalkaliphilic archaeon that grows optimally in 3.5M NaCl and at pH 8.5, but is sensitive to high magnesium concentrations.- Genome Structure :The genome of...
  
  
• Genus Natronorubrum
  Natronorubrum
  In taxonomy, Natronorubrum is a genus of the Halobacteriaceae.-External links:...
  
  

Class Methanobacteria

This section lists the genera of Archaea within the Class Methanobacteria

Methanobacteria

In taxonomy, the Methanobacteria are a class of the Euryarchaeota. Several of the classes of the Euryarchaeota are methanogens and the Methanobacteria are one of these classes.-External links:...

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Order Methanobacteriales

This section lists the genera of Archaea within the Order Methanobacteriales

Methanobacteriales

In taxonomy, the Methanobacteriales are an order of the Methanobacteria.- External links :...

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The following two genera of the Methanomicrobiales

Methanomicrobiales

In the taxonomy of microorganisms, the Methanomicrobiales are an order of the Methanomicrobia. Methanomicrobiales are strictly carbon dioxide reducing methanogens, using hydrogen or formate as the reducing agent.-External links:...

 have not been assigned to a family:

• Genus Methanoregula
  Methanoregula
  In the taxonomy of microorganisms, Candidatus Methanoregula is a genus of the Methanomicrobiales.-External links:...
  
  (candidatus)
• Genus Methanocalculus
  Methanocalculus
  In taxonomy, Methanocalculus is a genus of the Methanomicrobiales.- External links :...
  
  

Family Methanobacteriaceae

This section lists the genera of Archaea within the Family Methanobacteriaceae

Methanobacteriaceae

In taxonomy, the Methanobacteriaceae are a family of the Methanobacteriales.-External links:...

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• Genus Methanobacterium
  Methanobacterium
  In taxonomy, Methanobacterium is a genus of the Methanobacteriaceae.- External links :...
  
  
• Genus Methanobrevibacter
  Methanobrevibacter
  In taxonomy, Methanobrevibacter is a genus of the Methanobacteriaceae.-External links:...
  
  
• Genus Methanosphaera
  Methanosphaera
  In taxonomy, Methanosphaera is a genus of the Methanobacteriaceae.-External links:...
  
  
• Genus Methanothermobacter
  Methanothermobacter
  In taxonomy, Methanothermobacter is a genus of the Methanobacteriaceae.-External links:...
  
  

Family Methanothermaceae

This section lists the genera of Archaea within the Family Methanothermaceae

Methanothermaceae

In taxonomy, the Methanothermaceae are a family of the Methanobacteriales.-External links:...

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• Genus Methanothermus
  Methanothermus
  In taxonomy, Methanothermus is a genus of the Methanothermaceae.-External links:...
  
  

Class Methanococci

This section lists the genera of Archaea within the Class Methanococci

Methanococci

In taxonomy, the Methanococci are a class of the Euryarchaeota.-External links:...

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Order Methanococcales

This section lists the genera of Archaea within the Order Methanococcales

Methanococcales

In taxonomy, the Methanococcales are an order of the Methanococci.-External links:...

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Family Methanocaldococcaceae

This section lists the genera of Archaea within the Family Methanocaldococcaceae

Methanocaldococcaceae

In taxonomy, the Methanocaldococcaceae are a family of the Methanococcales.- External links :...

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• Genus Methanocaldococcus
  Methanocaldococcus
  In taxonomy, Methanocaldococcus is a genus of the Methanocaldococcaceae.Methanocaldococcus formerly known as Methanococcus is a genus of coccoid methanogens. They are all mesophiles, except the thermophilic M. thermolithotrophicus and the hyperthermophilic M. jannaschii...
  
  
• Genus Methanotorris
  Methanotorris
  In taxonomy, Methanotorris is a genus of the Methanocaldococcaceae.-External links:...
  
  

Family Methanococcaceae

This section lists the genera of Archaea within the Family Methanococcaceae

Methanococcaceae

In taxonomy, the Methanococcaceae are a family of the Methanococcales.-External links:...

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• Genus Methanococcus
  Methanococcus
  In taxonomy, Methanococcus is a genus of the Methanococcaceae.Methanococcus is a genus of coccoid methanogens. They are all mesophiles, except the thermophilic M. thermolithotrophicus and the hyperthermophilic M. jannaschii...
  
  
• Genus Methanothermococcus
  Methanothermococcus
  In taxonomy, Methanothermococcus is a genus of the Methanococcaceae.-External links:...
  
  

Class Methanomicrobia

This section lists the genera of Archaea within the Class Methanomicrobia

Methanomicrobia

In the taxonomy of microorganisms, the Methanomicrobia are a class of the Euryarchaeota.-External links:...

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Order Methanomicrobiales

This section lists the genera of Archaea within the Order Methanomicrobiales.

Family Methanocorpusculaceae

This section lists the genera of Archaea within the Family Methanocorpusculaceae

Methanocorpusculaceae

In taxonomy, the Methanocorpusculaceae are a family of the Methanomicrobiales.- External links :...

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• Genus Methanocorpusculum
  Methanocorpusculum
  In taxonomy, Methanocorpusculum is a genus of the Methanocorpusculaceae.-External links:...
  
  

Family Methanomicrobiaceae

This section lists the genera of Archaea within the Family Methanomicrobiaceae

Methanomicrobiaceae

In taxonomy, the Methanomicrobiaceae are a family of the Methanomicrobiales.-External links:...

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• Genus Methanoculleus
  Methanoculleus
  In taxonomy, Methanoculleus is a genus of the Methanomicrobiaceae.-External links:...
  
  
• Genus Methanofollis
  Methanofollis
  In taxonomy, Methanofollis is a genus of the Methanomicrobiaceae.- Description and significance :Methanofollis is a non-motile, Gram-negative, obligately anaerobic, mesophilic archaeon that produces methane...
  
  
• Genus Methanogenium
  Methanogenium
  In taxonomy, Methanogenium is a genus of the Methanomicrobiaceae.-External links:...
  
  
• Genus Methanolacinia
  Methanolacinia
  In taxonomy, Methanolacinia is a genus of the Methanomicrobiaceae.-External links:...
  
  
• Genus Methanomicrobium
  Methanomicrobium
  In taxonomy, Methanomicrobium is a genus of the Methanomicrobiaceae.-External links:...
  
  
• Genus Methanoplanus
  Methanoplanus
  In taxonomy, Methanoplanus is a genus of the Methanomicrobiaceae, comprising three species of methanogenic, or methane-producing, archaea.-External links:...
  
  

Family Methanospirillaceae

This section lists the genera of Archaea within the Family Methanospirillaceae

Methanospirillaceae

In taxonomy, the Methanospirillaceae are a family of the Methanomicrobiales.-External links:...

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• Genus Methanospirillum
  Methanospirillum
  In taxonomy, Methanospirillum is a genus of the Methanospirillaceae.-External links:...
  
  

Order Methanosarcinales

This section lists the genera of Archaea within the Order Methanosarcinales

Methanosarcinales

In taxonomy, the Methanosarcinales are an order of the Methanomicrobia.-External links:...

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Family Methanosaetaceae

This section lists the genera of Archaea within the Family Methanosaetaceae

Methanosaetaceae

In taxonomy, the Methanosaetaceae are a family of the Methanosarcinales.-External links:...

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• Genus Methanosaeta
  Methanosaeta
  In taxonomy, Methanosaeta is a genus of the Methanosaetaceae.-External links:...
  
  

Family Methanosarcinaceae

This section lists the genera of Archaea within the Family Methanosarcinaceae

Methanosarcinaceae

In taxonomy, the Methanosarcinaceae are a family of the Methanosarcinales.-External links:...

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• Genus Methanimicrococcus
  Methanimicrococcus
  In taxonomy, Methanimicrococcus is a genus of the Methanosarcinaceae.-External links:...
  
  
• Genus Methanococcoides
  Methanococcoides
  In taxonomy, Methanococcoides is a genus of the Methanosarcinaceae.Methanococcoides species are methanogens entirely dependent on methylated compounds for nutrition.-External links:...
  
  
• Genus Methanohalobium
  Methanohalobium
  In taxonomy, Methanohalobium is a genus of the Methanosarcinaceae.-External links:...
  
  
• Genus Methanohalophilus
  Methanohalophilus
  In taxonomy, Methanohalophilus is a genus of the Methanosarcinaceae.-External links:...
  
  
• Genus Methanolobus
  Methanolobus
  In taxonomy, Methanolobus is a genus of the Methanosarcinaceae.-External links:...
  
  
• Genus Methanomethylovorans
  Methanomethylovorans
  In taxonomy, Methanomethylovorans is a genus of the Methanosarcinaceae.-External links:...
  
  
• Genus Methanosalsum
  Methanosalsum
  In taxonomy, Methanosalsum is a genus of the Methanosarcinaceae.-External links:...
  
  
• Genus Methanosarcina
  Methanosarcina
  Methanosarcina are the only known anaerobic methanogens to produce methane using all three known metabolic pathways for methanogenesis. Most methanogens make methane from carbon dioxide and hydrogen gas. Some others utilize acetate in the acetoclastic pathway...
  
  

Order Methanopyrales

This section lists the genera of Archaea within the Order Methanopyrales

Methanopyrales

In taxonomy, the methanopyrales are an order of the methanopyri.-External links:...

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Family Methanopyraceae

This section lists the genera of Archaea within the Family Methanopyraceae

Methanopyraceae

In taxonomy, the Methanopyraceae are a family of the Methanopyrales.-External links:...

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• Genus Methanopyrus
  Methanopyrus
  In taxonomy, Methanopyrus is a genus of the Methanopyraceae.Methanopyrus is a genus of methanogen, with a single described species, M. kandleri. It is a hyperthermophile, discovered on the wall of a black smoker from the Gulf of California at a depth of 2000 m, at temperatures of 84-110 °C...
  
  

Order Thermococcales

This section lists the genera of Archaea within the Order Thermococcales

Thermococcales

In taxonomy, the Thermococcales are an order of the Thermococci.-External links:...

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Family Thermococcaceae

This section lists the genera of Archaea within the Family Thermococcaceae

Thermococcaceae

In taxonomy, the Thermococcaceae are a family of the Thermococcales.- External links :...

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• Genus Palaeococcus
  Palaeococcus
  In taxonomy, Palaeococcus is a genus of the Thermococcaceae.-External links:...
  
  
• Genus Pyrococcus
  Pyrococcus
  In taxonomy, Pyrococcus is a genus of the Thermococcaceae.- Description and significance :Pyrococcus has similar characteristics of other archaea such as Archaeoglobus, Thermoautotrophican, and Methanococcus in the respect that they are all thermophilic and anaerobic...
  
  
• Genus Thermococcus
  Thermococcus
  In taxonomy, Thermococcus is a genus of extreme thermophiles in the family the Thermococcaceae.They consist of gram-negative spheres that move with flagella. They are organothrophic anaerobes, growing in temperatures above 70°C...
  
  

Class Thermoplasmata

This section lists the genera of Archaea within the Class Thermoplasmata

Thermoplasmata

In taxonomy, the Thermoplasmata are a class of the Euryarchaeota.All are acidophiles, growing optimally at pH below 2. Picrophilus is currently the most acidophilic of all known organisms growing at a minimum pH of 0.06. Many of these organisms do not contain a cell wall, although this is not true...

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Order Thermoplasmatales

This section lists the genera of Archaea within the Order Thermoplasmatales

Thermoplasmatales

In taxonomy, the Thermoplasmatales are an order of the Thermoplasmata. All are acidophiles, growing optimally at pH below 2. Picrophilus is currently the most acidophilic of all known organisms growing at a minimum pH of 0.06. Many of these organisms do not contain a cell wall, although this is...

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Family Ferroplasmaceae

This section lists the genera of Archaea within the Family Ferroplasmaceae

Ferroplasmaceae

In taxonomy, the Ferroplasmaceae are a family of the Thermoplasmatales.-External links:...

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• Genus Ferroplasma
  Ferroplasma
  In taxonomy, Ferroplasma is a genus of the Ferroplasmaceae.The genus Ferroplasma consists solely of F. acidophilum, an acidophilic iron-oxidizing member of the Euryarchaeota. Unlike other members of the Thermoplasmata F.acidophilum is a mesophile with a temperature optimum of approximately 35°C, at...
  
  

Family Picrophilaceae

This section lists the genera of Archaea within the Family Picrophilaceae

Picrophilaceae

In taxonomy, the Picrophilaceae are a family of the Thermoplasmatales.-External links:...

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• Genus Picrophilus
  Picrophilus
  In taxonomy, Picrophilus is an archaean genus of the family Picrophilaceae.Picrophilus is an extremely acidophilic genus within Euryarchaeota. These microbes are the most acidophilic organisms currently known, with the ability to grow at a pH of -0.06. They are obligate acidophiles and are unable...
  
  

Family Thermoplasmataceae

This section lists the genera of Archaea within the Family Thermoplasmataceae

Thermoplasmataceae

In taxonomy, the Thermoplasmataceae are a family of the Thermoplasmatales.-External links:...

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• Genus Thermoplasma
  Thermoplasma
  In taxonomy, Thermoplasma is a genus of the Thermoplasmataceae.Thermoplasma is a genus of archaea. It belongs to the Thermoplasmata, which thrive in acidic and high-temperature environments. Thermoplasma are facultative anaerobes and respire using sulfur and organic carbon...
  
  

Phylum Korarchaeota

This section lists the genera of Archaea within the Phylum Korarchaeota

Korarchaeota

In taxonomy, the Korarchaeota are a phylum of the Archaea.Analysis of their 16S rRNA gene sequences suggests that they are a deeply-branching lineage that does not belong to the main archaeal groups, Crenarchaeota and Euryarchaeota...

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Only environmental samples of the Korarchaeota have been studied.

Phylum Nanoarchaeota

This section lists the genera of Archaea within the Phylum Nanoarchaeota

Nanoarchaeota

In taxonomy, the Nanoarchaeota are a phylum of the Archaea. This phylum currently has only one representative, Nanoarchaeum equitans.-External links:...

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The following genus of the Nanoarchaeota has not been assigned to a class:

• Genus Nanoarchaeum
  Nanoarchaeum
  Nanoarchaeum equitans is a species of tiny microbe, discovered in 2002 in a hydrothermal vent off the coast of Iceland by Karl Stetter. Since it grows in temperatures approaching boiling, it is considered to be a thermophile. Nanoarchaeum appears to be an obligatory symbiont on the archaeon...
  
  

phylum Aigarchaeota

This section lists the genera of Archaea within the Phylum Aigarchaeota.