


| Genus Clostridium Prazmowski 1880 |
| Rods, usually Gram-positive, the majority of species form oval/spherical endospores that usually distend the cell, usually catalase negative, most species are obligately anaerobic, although tolerance to oxygen varies widely, growth is most rapid at pH 6.5-7 and 30-37 ºC. The spores resist 10 min. at 80 ºC. Clostridium spp. are resistant at colistin and sensitive to vancomycin. |

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| R E G N U M PROKARYOTAE |
![]() | Clostridium barkeri * (moved to genus Eubacterim) |
![]() | Clostridium beijerinckii | |
![]() | Clostridium bifermentans |
![]() | Clostridium bryantii * (moved to genus Syntrophomonas) |
![]() | Clostridium durum * (moved to genus Paenibacillus) |
![]() | Clostridium estertheticum subsp. estertheticum | |
![]() | Clostridium estertheticum subsp. laramiense | |
![]() | Clostridium fallax | |
![]() | Clostridium felsineum | |
![]() | Clostridium ghonii | |
![]() | Clostridium glycolicum | |
![]() | Clostridium haemolyticum |
![]() | Clostridium hastiforme * (synonym of Tissierella preacuta) |
![]() | Clostridium lortetii * (moved to genus Sporohalobacter) |
![]() | Clostridium malenominatum | |
![]() | Clostridium mangenotii (moved to genus Clostridioides) | |
![]() | Clostridium nexile | |
![]() | Clostridium novyi | |
![]() | Clostridium oceanicum | |
![]() | Clostridium orbiscindens (see Flavonifractor plautii) | |
![]() | Clostridium oroticum |
![]() | Clostridium oxalicum * (moved to genus Oxalophagus) |
![]() | Clostridium villosum * (moved to genus Filifactor) | |
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![]() | Blautia (Clostridium) coccoides |
![]() | Cellulosilyticum lentocellum | |
![]() | Cellulosilyticum ruminicola |
![]() | Flavonifractor plautii | |