NCIt definition : A species of anaerobic, Gram positive, rod shaped bacteria assigned to the phylum
Firmicutes. This species is catalase and indole negative, contains type B murein in
its cell wall, is nonsporulating and hydrolyzes esculin. H. filiformis is most often
isolated from feces.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to the species Holdemania filiformis.;