Roseburia intestinalis is a saccharolytic, butyrate-producing bacterium first isolated from human faeces. It is anaerobic, gram-positive, non-sporeforming, slightly curved rod-shaped and motile by means of multiple subterminal flagella. L1-82<sup>T</sup> (= DSM 14610<sup>T</sup> = NCIMB 13810<sup>T</sup>) is the type strain.