Acetoanaerobium Asaccharospora Clostridioides Criibacterium Filifactor Fusibacter Intestinibacter Maledivibacter Paeniclostridium Paraclostridium Paramaledivibacter Peptacetobacter Peptoanaerobacter Peptoclostridium Peptostreptococcus Proteocatella Romboutsia Sporacetigenium Tepidibacter Terrisporobacter Wukongibacter The Peptostreptococcaceae are a family of Gram-positive anaerobic bacteria in the class Clostridia.

[3] Recent taxonomic revisions have added several other genera like Acetoanaerobium, Filifactor, Proteocatella, Sporacetigenium, and Tepidibacter to this family, with members largely characterized by their morphology and function.

[4] More recent studies have also advocated the inclusion of new genera from a closely related clade, including Peptostreptococcus, Asaccharospora, Clostridioides, Intestinibacter, Paeniclostridium, Paraclostridium, Peptacetobacter, Romboutsia, and Terrisporobacter using 16rRNA gene sequences to support the addition.

[6] Peptostreptococcus species occupy a specialized niche in the rumen of dairy cows, sheep, and deer as peptide- and amino acid-degrading microorganisms.

Decreased abundance has been reported for Crohn's disease,[8] while the genus Peptostreptococcus appears to be more common in patients diagnosed with colorectal cancer.