Bacteroides barnesiae

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Higher order taxa

Domain: Bacteria: Phylum: Bacteroidetes Class: Bacteroidia Order: Bacteroidales Family: Bacteroidaceae Genus: Bacteroides


Bacteroides Barnesiae

Type Strain

JCM 13652

Description and significance


"Bacteroides barnesiae ( N.L. gen. fem. n. barnesiae of Barnes, named after Ella M. Barnes, a British microbiolog- ist, who has contributed much to our knowledge of intestinal bacteriology and anaerobic bacteriology in general)" (Pham Thi Ngoc, 2006) .

Bacteroides barnesiae is a gram-negative, pleomorphic rod that is sized at 0⋅5–1⋅4 μm wide and 0⋅8–10⋅6 μm long. This species is non-spore-forming, non-motile and completely anaerobic, which means it does not require oxygen to grow. The microbe is commonly found in the gastrointestinal tract of humans and animals, also known as the caecum. The species benefits the host by preventing pathogenic microorganisms from forming colonies inside the intestines, but this only happens if the microbe is strictly retained in the gut. The major cellular fatty acids are anteiso-C15:0 and iso-C15:0. When plated on a EG blood agar, containing 5% horse blood, the colonies appear a white-greyish color, circular and raised.

This microbe is related to two other Bacteroides species known as Bacteroides gallinarum and Bacteroides salanitronis. All three of these species were isolated from the gastrointestinal tract of a healthy chicken. To determine this, all the microbes were isolated onto a EG agar containing 5% horse blood for 48 hours at 37°C and placed in a anaerobic environment.


Bacteroides barnesiae lives in the gastrointestinal tract of humans and animals, and grows where bile is present. This species grows best at a temperature of 37°C and in an anaerobic environment.

Cell Metabolism

"Bacteroides species are thought to play a fundamental role in the breakdown of complex molecules (such as polysaccharides) into simpler compounds that are used by the animal host as well as the micro-organisms themselves, in the utilization of nitrogenous substances and in the biotransformation of bile acids and other steroids"(Pham Thi Ngoc, 2006).

Genetic Characteristics

The % G+C of this species is 46⋅8 mol%


[ Pham Thi Ngoc Lan, Mitsuo Sakamoto,Shinji Sakata and Yoshimi Benno. "Bacteroides barnesiae sp. nov., Bacteroides salanitronis sp. nov. and Bacteroides gallinarum sp. nov., isolated from chicken caecum '". International Journal of Systematic and Evolutionary Microbiology. 2006, Volume 56. p. 2853-2859.]

Edited by (Sierra Harris), student of Rachel Larsen at the University of Southern Maine