Cel.lu.lo.si.ly.ti.ca.ce'ae. N.L. neut. n.Cellulosilyticuma bacterial genus; N.L. fem. pl. n.CellulosilyticaceaetheCellulosilyticumfamily.Firmicutes / Clostridia / Clostridiales / CellulosilyticaceaeSlightly curved rod‐shaped cells. Gram‐positive cell‐wall structure but stain Gram‐negative. Terminal spores formed. Mesophilic, optimum growth temperature is approximately 40°C.Obligate anaerobic. No microaerophilic or aerobic growth occurs. Produce acetate, ethanol, and/or formate as the major end products, but not butyric or propionic acid. Hydrolyze cellulose and xylan and ferment cellobiose, but not ferment lactate and pyruvate. The predominant fatty acids are C16:0(27.1 %), C14:0(9.2 %), and iso‐C16:0(6.4%). Phylogenetically distant from the familyLachnospriaceae(Clostridum cluster XIVb), a member of the phylum Firmicutes, with less than 87.7% 16S rRNA similarity. Thus far, only one genusCellulosilyticumis described.DNA G + C content (mol%): 33–36.Type genus:CellulosilyticumCai and Dong 2010, 848VP.