RT Journal Article SR Electronic(1) A1 Whitehead, Terence R. A1 Cotta, Michael A. A1 Falsen, Enevold A1 Moore, Edward A1 Lawson, Paul A.YR 2011 T1 Peptostreptococcus russellii sp. nov., isolated from a swine-manure storage pit JF International Journal of Systematic and Evolutionary Microbiology, VO 61 IS 8 SP 1875 OP 1879 DO https://doi.org/10.1099/ijs.0.023762-0 PB Microbiology Society, SN 1466-5034, AB Using a polyphasic approach, a taxonomic study was performed on seven strains of an unknown Gram-reaction-positive, non-spore-forming, obligately anaerobic coccus-shaped bacterium, isolated from a swine-manure storage pit. Comparative 16S rRNA gene sequencing confirmed that all seven isolates were highly related to each other and formed a hitherto unknown lineage within the clostridial rRNA XI cluster of organisms. Pairwise analysis demonstrated that the novel organism was most closely related to Peptostreptococcus anaerobius CCUG 7835T and Peptostreptococcus stomatis CCUG 51858T with 16S rRNA gene sequence similarities of 95.5 and 93.0 %, respectively. The peptidoglycan type of the cell wall was determined to be A4α l-Lys–d-Asp and glucose, xylose and traces of mannose were detected as the cell–wall sugars. Based on biochemical, chemotaxonomic and phylogenetic evidence the unknown bacterium represents a new species of the genus Peptostreptococcus, for which the name Peptostreptococcus russellii sp. nov, is proposed. The type strain is RT-10BT ( = CCUG 58235T  = NRRL B-59380T  = DSM 23041T)., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijs.0.023762-0