Order Clostridiales

Family Clostridiaceae
Acidaminobacter - Alkaliphilus - Anaerobacter - Anaerosporobacter - Anoxynatronum - Caloramator - Caloranaerobacter - Caminicella - Clostridiisalibacter - Clostridium - Dorea - Ethanoligenens - Garciella - Geosporobacter - Guggenheimella - Hespellia - Lactonifactor - Lutispora - Marvinbryantia - Natronincola - Oxobacter - Parasporobacterium - Sarcina - Soehngenia - Sporacetigenium - Tepidibacter - Tepidimicrobium - Thermobrachium - Thermohalobacter - Tindallia

Family "Eubacteriaceae"
Acetobacterium - Alkalibacter - Anaerofustis - Anaerovorax - Eubacterium - Mogibacterium - Pseudoramibacter

Family "Gracilibacteraceae"
Gracilibacter

Family "Heliobacteriaceae"
Heliobacillus - Heliobacterium - Heliophilum - Heliorestis

Family "Lachnospiraceae"
Acetitomaculum - Anaerostipes - Butyrivibrio - Catonella - Coprococcus - Johnsonella - Lachnobacterium - Lachnospira - Moryella - Oribacterium - Pseudobutyrivibrio - Roseburia - Shuttleworthia - Sporobacterium - Syntrophococcus

Family Oscillospiraceae
Oscillibacter - Oscillospira

Family Peptococcaceae
Carboxydothermus - Cryptanaerobacter - Dehalobacter - Desulfitobacterium - Desulfonispora - Desulfosporosinus - Desulfotomaculum - Desulfurispora - Pelotomaculum - Peptococcus - Syntrophobotulus - Thermincola - Thermoterrabacterium

Family "Peptostreptococcaceae"
Anaerococcus - Filifactor - Finegoldia - Fusibacter - Gallicola - Helcococcus - Parvimonas - Peptoniphilus - Peptostreptococcus - Sedimentibacter - Sporanaerobacter - Tissierella

Family "Ruminococcaceae"
Acetanaerobacterium - Acetivibrio - Anaerofilum - Anaerotruncus - Faecalibacterium - Fastidiosipila - Papillibacter - Ruminococcus - Sporobacter - Subdoligranulum

Family Syntrophomonadaceae
Anaerobranca - Caldicellulosiruptor - Carboxydocella - Dethiobacter - Pelospora - Syntrophomonas - Syntrophospora - Syntrophothermus - Thermaerobacter - Thermohydrogenium - Thermosyntropha

Family Veillonellaceae
Acetonema - Acidaminococcus - Allisonella - Anaeroarcus - Anaeroglobus - Anaeromusa - Anaerosinus - Anaerovibrio - Centipeda - Dendrosporobacter - Dialister - Megamonas - Megasphaera - Mitsuokella - Pectinatus - Pelosinus - Phascolarctobacterium - Propionispira - Propionispora - Quinella - Schwartzia - Selenomonas - Sporomusa - Sporotalea - Succiniclasticum - Succinispira - Thermosinus - Veillonella - Zymophilus

Unclassified Clostridiales
Anaerovirgula - Blautia - Dethiosulfatibacter - Howardella - Proteiniborus