Ellagibacter

Ellagibacter is a genus of Gram-positive and strictly anaerobic bacteria in the family Eggerthellaceae, within the phylum Actinomycetota. The type and only species, Ellagibacter isourolithinifaciens, was isolated from a fecal sample of a healthy human.^[1]

Ellagibacter
Scientific classification
Domain:	Bacteria
Phylum:	Actinomycetota
Class:	Coriobacteriia
Order:	Coriobacteriales
Family:	Eggerthellaceae
Genus:	Ellagibacter Beltrán et al. 2018
Type species
Ellagibacter isourolithinifaciens Beltrán et al. 2018

Etymology

The genus name Ellagibacter is derived from modern Latin: acidum ellagicum (ellagic acid) and bacter (rod), meaning "ellagic acid-transforming rod."

Characteristics

Members of this genus are obligate anaerobes that play a role in polyphenol metabolism in the human gut microbiome. E. isourolithinifaciens is known to convert ellagic acid into isourolithin A, a urolithin metabolite with potential health benefits including anti-inflammatory and antioxidant effects.^[1][2]

Species

As of 2025, the genus Ellagibacter includes only one validly published species:

• Ellagibacter isourolithinifaciens