The Clostridia are a class of Firmicutes, including Clostridium and other similar genera. They are distinguished from the Bacilli by lacking aerobic respiration. Studies show they are not a monophyletic group, and their relationships are not entirely certain. Currently most are placed in a single order called Clostridiales, but this is not a natural group and is likely to be redefined in the future.
Notable species of this Class include;
- Clostridium perfringens (Gangrene,Food Poisoning)
- Clostridium difficile (Colitis)
- Clostridium tetani (Tetanus)
- Clostridium botulinum (Botulism)
- Clostridium acetobutylicum
Some of the enzymes produced by this group are used in bioremediation.