Bar.ne.si.el'la. N.L. dim. fem. n. Barnesiella named after the British microbiologist Ella M. Barnes, who contributed much to knowledge of intestinal bacteriology and to anaerobic bacteriology in general.

Bacteroidetes / Bacteroidia / Bacteroidales / Porphyromonadaceae / Barnesiella

Rods (0.8–1.6 × 1.7–11 µm). Nonsporeforming. Nonmotile. Gram-negative. Obligately anaerobic. On Eggerth–Gagnon agar, colonies are 1–2 mm in diameter, gray to off-white–gray, circular, entire, slightly convex, and smooth. Saccharolytic, with a strictly fermentative type of metabolism. Acetic and succinic acids are the main fermentation products. Growth is inhibited on a medium containing 20% bile. Esculin is hydrolyzed. Indole-negative. The predominant menaquinones are MK-11 and MK-12. Isolated from the chicken cecum.

DNA G+C content (mol%): 52.

Type species: Barnesiella viscericola Sakamoto, Lan and Benno 2007b, 345^VP.