Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
4 Click on "+" to expand/show all child taxa
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- Biota
- Kingdom Animalia
- Kingdom Archaea
- Kingdom Bacteria
- Phylum Acidobacteria
- Phylum Actinobacteria
- Phylum Aquificae
- Phylum Armatimonadetes
- Phylum Bacteria (awaiting allocation)
- Phylum Bacteria incertae sedis
- Phylum Bacteroidetes
- Phylum Balneolaeota
- Phylum Caldiserica
- Phylum Calditrichaeota
- Phylum Chlamydiae
- Phylum Chlorobi
- Phylum Chloroflexi
- Phylum Chrysiogenetes
- Phylum Cyanobacteria
- Phylum Deferribacteres
- Phylum Deinococcus-Thermus
- Phylum Dictyoglomi
- Phylum Elusimicrobia
- Phylum Fibrobacteres
- Phylum Firmicutes
- Class Bacilli
- Class Clostridia
- Order Clostridia (awaiting allocation)
- Order Clostridiales
- Family Caldicoprobacteraceae Yokoyama et al., 2010
- Family Catabacteriaceae Lau et al., 2006
- Family Clostridiaceae Pribram, 1933
- Family Clostridiales incertae sedis
- Family Defluviitaleaceae Jabari et al., 2012
- Family Eubacteriaceae Ludwig et al., 2010
- Family Gracilibacteraceae Lee et al., 2010
- Family Heliobacteriaceae Madigan & Asao, 2010
- Family Lachnospiraceae Rainey, 2010
- Family Oscillospiraceae Peshkoff, 1940 accepted as Ruminococcaceae Rainey, 2010
- Family Peptococcaceae Rogosa, 1971
- Family Peptostreptococcaceae Ezaki, 2010
- Family Proprionibacteriaceae accepted as Eubacteriaceae Ludwig et al., 2010
- Family Proteinivoraceae Kevbrin et al., 2014
- Family Ruminococcaceae Rainey, 2010
- Genus Acetanaerobacterium Chen & Dong, 2004
- Genus Acetivibrio Patel, Khan, Agnew & Colvin, 1980
- Genus Acutalibacter Lagkouvardos et al., 2016
- Genus Anaerobacterium Horino et al., 2014
- Genus Anaerofilum Zellner, Stackebrandt, Nagel, Messner, Weiss & Winter, 1996
- Species Anaerofilum agile Zellner et al., 1996
- Species Anaerofilum pentosovorans Zellner et al., 1996
- Genus Anaerotruncus Lawson, Song, Liu, Molitoris, Vaisanen, Collins & Finegold, 2004
- Genus Ercella van Gelder et al., 2014
- Genus Ethanoligenens Xing, Ren, Li, Lin, Wange & Zhao, 2006
- Genus Faecalibacterium Duncan, Hold, Harmsen, Stewart & Flint, 2002
- Genus Fastidiosipila Falsen et al., 2005
- Genus Fournierella Togo et al., 2017
- Genus Harryflintia Petzoldt et al., 2016
- Genus Herbivorax Koeck et al., 2016
- Genus Hydrogenoanaerobacterium Song & Dong, 2009
- Genus Mageeibacillus Austin et al., 2016
- Genus Oscillibacter Iino et al., 2007
- Genus Oscillospira Chatton & Pérard, 1913 (Approved Lists, 1980)
- Genus Papillibacter Defnoun, Labat, Ambrosio, Garcia & Patel, 2000
- Genus Pseudobacteroides Horino et al., 2014
- Genus Ruminococcus Sijpesteijn, 1948 (Approved Lists, 1980)
- Genus Ruthenibacterium Shkoporov et al., 2016
- Genus Sporobacter Grech-Mora et al., 1996
- Genus Subdoligranulum Holmstrom, Collins, Moller, Falsen & Lawson, 2004
- Family Syntrophomonadaceae Zhao et al., 1993 emend. Jumas-Bilak et al., 2009
- Genus Biocatenoides J.W. Schopf, 1968 †
- Order Eubacteriales accepted as Clostridiales
- Order Halanaerobiales
- Order Natranaerobiales
- Order Thermoanaerobacterales
- Order Thermoanaerobacteriales accepted as Thermoanaerobacterales
- Class Erysipelotrichi accepted as Erysipelotrichia
- Class Erysipelotrichia
- Class Limnochordia
- Class Negativicutes
- Class Thermolithobacteria
- Class Tissierellia
- Phylum Fusobacteria
- Phylum Gemmatimonadetes
- Phylum Kiritimatiellaeota
- Phylum Lentisphaerae
- Phylum Myxobacteria accepted as Proteobacteria
- Phylum Nitrospira
- Phylum Omnibacteria accepted as Bacteria
- Phylum Planctomycetes
- Phylum Prochlorophyta accepted as Cyanobacteria
- Phylum Proteobacteria
- Phylum Rhodothermaeota
- Phylum Schizophyta accepted as Bacteria
- Phylum Spirochaetae
- Phylum Spirochaetes accepted as Spirochaetae
- Phylum Synergistetes
- Phylum Tenericutes
- Phylum Thermodesulfobacteria
- Phylum Thermomicrobia accepted as Chloroflexi
- Phylum Thermotogae
- Phylum Verrucomicrobia
- Class Myxobacteria (awaiting allocation) accepted as Bacteria
- Genus Animikiea E.S. Barghoorn in E.S. Barghoorn & S.A. Tyler, 1965 †
- Genus Coleobacter J.H. Oehler, 1977 †
- Genus Concentrisphaera G. Burmann, 1998 †
- Genus Crassosphaera G. Burmann, 1998 †
- Genus Eoastrion E.S. Barghoorn in Barghoorn & Tyler, 1965 †
- Genus Eobacterium E.S. Barghoorn & J.W. Schopf, 1966
- Genus Fabiformis V.G. Pyatiletov, 1988 †
- Genus Favososphaera G. Burmann, 1972 †
- Genus Ferrimonilis J.H. Oehler, 1977 †
- Genus Globus G. Vidal in Moczydłowska & Vidal, 1988 †
- Genus Gunflintia E.S. Barghoorn in Barghoorn & Tyler, 1965 †
- Genus Kakabekia E.S. Barghoorn in Barghoorn & Tyler, 1965 †
- Genus Leptoteichos A.H. Knoll, E.S. Barghoorn & S.M. Awramik, 1978 †
- Genus Microagglomeratus S.M. Awramik in Allison & Awramik, 1989 †
- Genus Phaeostrepte Skuja ex T. Willén, 1992
- Genus Ramacia J.H. Oehler, 1977 †
- Genus Rhicnonema H.J. Hoffmann, 1976 †
- Genus Sibiricum Stanevich, 2004 †
- Genus Tenuisphaera G. Burmann, 1998 †
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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