Erysipelotrichales
The Erysipelotrichia are a class of bacteria of the phylum Bacillota. The only order is Erysipelotrichales. Species of this class are common in the gut microbiome, as they have been isolated from swine manure and increase in composition of the mouse gut microbiome for mice switched to diets high in fat.
This class has the unusual phylogenetic position of branching within Mycoplasmatota, a phylum largely without peptidoglycan cell wall. Its ability to make a peptidoglycan and sporulate, combined with this position as well as Mycoplasmotota metagenomes with similar gene contents, imply that the Mycoplasmatotal lineages have independently reduced their cell walls.
Phylogeny
The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature and National Center for Biotechnology Information.♦ Paraphyletic Erysipelotrichia