Firmicutes

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Firmicutes
Bacillus subtilis, Gram stained
Scientific classification
Domain: Bacteria
Phylum: Firmicutes
Classes

Bacilli
Clostridia

The Firmicutes are a phylum of bacteria, most of which have the Gram-positive type of cell walls.

Classes[change | edit source]

The group is typically divided into the Clostridia, which are anaerobic, the Bacilli, which are aerobic, and the Mollicutes, a class of bacteria which do not have cell walls.

On phylogenetic trees, the first two groups show up as paraphyletic or polyphyletic, as do their main genera, Clostridium and Bacillus.[1]

References[change | edit source]