Phylum "Spirochaetes" or "Spirochaetae"
Class Spirochaetes
Order Spirochaetales
Family "Brachyspiraceae"
Brachyspira - Serpulina
Family Leptospiraceae
Leptonema - Leptospira - Turneriella
Family Spirochaetaceae
Borrelia - Brevinema - Clevelandina - Cristispira - Diplocalyx - Hollandina - Pillotina - Spirochaeta - Treponema
Phylum "Tenericutes"
Class Mollicutes (In the next edition of the Bergey's Manual of Systematic Bacteriology, the class Mollicutes will be excluded from the phylum "Firmicutes" and classified in the phylum "Tenericutes" - Reference: K.H. Schleifer and W. Ludwig, personal communication)
Order Acholeplasmatales
Family Acholeplasmataceae
Acholeplasma
Order Anaeroplasmatales
Family Anaeroplasmataceae
Anaeroplasma - Asteroleplasma
Order Entomoplasmatales
Family Entomoplasmataceae
Entomoplasma - Mesoplasma
Family Spiroplasmataceae
Spiroplasma
Order Mycoplasmatales
Family Mycoplasmataceae
Allobaculum - Eperythrozoon - Haemobartonella - Mycoplasma - Ureaplasma
Order incertae sedis
Family Erysipelotrichaceae
Bulleidia - Erysipelothrix - Holdemania - Solobacterium
Phylum "Thermodesulfobacteria"
Class Thermodesulfobacteria
Order Thermodesulfobacteriales
Family Thermodesulfobacteriaceae
Thermodesulfatator - Thermodesulfobacterium
Phylum "Thermomicrobia"
Class Thermomicrobia
Order Thermomicrobiales
Family Thermomicrobiaceae
Thermomicrobium
Phylum "Thermotogae"
Class Thermotogae
Order Thermotogales
Family Thermotogaceae
Fervidobacterium - Geotoga - Marinitoga - Petrotoga - Thermosipho - Thermotoga
Phylum "Verrucomicrobia"
Class Verrucomicrobiae
Order Verrucomicrobiales
Family Verrucomicrobiaceae
Akkermansia - Prosthecobacter- Rubritalea - Verrucomicrobium
Class Opitutae
Order Opitutales
Family Opitutaceae
Alterococcus - Opitutus
Order Puniceicoccales
Family Puniceicoccaceae
Cerasicoccus - Coraliomargarita - Pelagicoccus - Puniceicoccus
Unclassified "Bacteria"
Class Ktedonobacteria
Order Ktedonobacterales
Family Ktedonobacteraceae
Ktedonobacter
Jonquetella
Domain "Archaea"
Phyla: "Crenarchaeota", "Euryarchaeota"
Phylum "Crenarchaeota"
Class Thermoprotei or Crenarchaeota
Order "Caldisphaerales"
Family "Caldisphaeraceae"
Caldisphaera
Order Cenarchaeales
Family "Cenarchaeaceae"
"Cenarchaeum"
Order Desulfurococcales
Family Desulfurococcaceae
Acidilobus - Aeropyrum - Desulfurococcus - Ignicoccus - Ignisphaera - Staphylothermus - Stetteria - Sulfophobococcus - Thermodiscus - Thermosphaera
Family Pyrodictiaceae
Hyperthermus - Pyrodictium - Pyrolobus
Order Sulfolobales
Family Sulfolobaceae
Acidianus - Desulfurolobus - Metallosphaera - Stygiolobus - Sulfolobus - Sulfurisphaera - Sulfurococcus
Order Thermoproteales
Family Thermofilaceae
Thermofilum
Family Thermoproteaceae
Caldivirga - Pyrobaculum - Thermocladium - Thermoproteus - Vulcanisaeta
Phylum "Euryarchaeota"
Class Archaeoglobi
Order Archaeoglobales
Family Archaeoglobaceae
Archaeoglobus - Ferroglobus - Geoglobus
Class Halobacteria or Halomebacteria
Order Halobacteriales
Family Halobacteriaceae
Haladaptatus - Halalkalicoccus - Haloarcula - Halobacterium - Halobaculum - Halobiforma - Halococcus - Haloferax - Halogeometricum - Halomicrobium - Halopiger - Haloplanus - Haloquadratum - Halorhabdus - Halorubrum - Halosimplex - Halostagnicola - Haloterrigena - Halovivax - Natrialba - Natrinema - Natronobacterium - Natronococcus - Natronolimnobius - Natronomonas - Natronorubrum
Class Methanobacteria
Order Methanobacteriales
Family Methanobacteriaceae
Methanobacterium - Methanobrevibacter - Methanosphaera - MethanothermobacterFamily Methanothermaceae
Methanothermus
Class Methanococci
or Methanothermea
Order Methanococcales
Family Methanocaldococcaceae
Methanocaldococcus - Methanotorris
Family Methanococcaceae
Methanococcus - Methanothermococcus
Class "Methanomicrobia"
Order Methanomicrobiales
Family Methanocorpusculaceae
Methanocorpusculum
Family Methanomicrobiaceae
Methanoculleus - Methanofollis - Methanogenium - Methanolacinia - Methanomicrobium - Methanoplanus
Family Methanospirillaceae
Methanospirillum
Unclassified Methanomicrobiales
Methanocalculus
Order Methanosarcinales
Family Methanosaetaceae
Methanosaeta - Methanothrix
Family Methanosarcinaceae
Halomethanococcus - Methanimicrococcus - Methanococcoides - Methanohalobium - Methanohalophilus - Methanolobus - Methanomethylovorans - Methanosalsum - Methanosarcina
Family Methermicoccaceae
Methermicoccus
Class Methanopyri
Order Methanopyrales
Family Methanopyraceae
Methanopyrus
Class Thermococci or Protoarchaea
Order Thermococcales
Family Thermococcaceae
Palaeococcus - Pyrococcus - Thermococcus
Class Thermoplasmata
Order Thermoplasmatales
Family Ferroplasmaceae
Ferroplasma
Family Picrophilaceae
Picrophilus
Family Thermoplasmataceae
Thermoplasma
Unclassified Thermoplasmatales
Thermogymnomonas