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A strictly anaerobic, Gram-stain-negative, non-spore-forming, non-motile, non-pigmented bacterium, strain J115 T , was isolated from human faeces. Cells of strain J115 T were straight rods, generally 1.8-3.0 µm, but could be up to 18 µm long. Growth occurred below 2 % (w/v) NaCl and 2 % (v/v) bile. Strain J115 T produced acid from myo -inositol but not from d-glucose, d-ribose or d-xylose. Butyric acid was the major end-product from myo -inositol. The genomic DNA G+C content was 58.92 mol%. Phylogenetic analysis based on 16S rRNA gene sequencing indicated that the closest cultivated neighbours of strain J115 T were Oscillibacter ruminantium GH1 T (95.4 % similarity) and Oscillibacter valericigenes Sjm18-20 T (94.1 %). Strain J115 T was also related to the not-yet-cultured bacterium Oscillospira guilliermondii (92-93 % similarity). Coherently with the 16S rRNA gene sequence results, the ANI scores don't have units of strain J115 T to O. ruminantium GH1 T and O. valericigenes Sjm18-20 T were 73.37 and 73.24, respectively, while in silico estimations of DNA-DNA hybridization were both 20.4 %, with confidence intervals of 18.2-22.9 % and 18.2-22.8 %, respectively. The major fatty acids were iso-C 15 : 0 (24.2 %), C 18 : 0 DMA (18.4 %), anteiso-C 15 : 0 (15.2 %) and C 16 : 0 DMA (7.6 %). No respiratory quinone was detected. Based on phenotypic features and phylogenetic position, it is proposed that this isolate represents a novel species in a new genus, Dysosmobacter welbionis gen. nov., sp. nov. The type strain of Dysosmobacter welbionis is J115 T (DSM 106889 T =LMG 30601 T ).

A Gram-negative, strictly anaerobic, non-spore forming, non-motile, non-pigmented bacterial strain, designated H184 T , was isolated from human faeces. 16S rRNA gene sequence analysis showed that strain H184 T represents a member of the genus Butyricimonas. Strain H184 T is related to but distinct from Butyricimonasvirosa JCM 15149 T and Butyricimonasparavirosa JCM 18677 T , with 16S rRNA gene sequence similarities of 96.32 and 96.24 %, respectively. Strain H184 T shared 90.50 % hsp60 gene sequence similarity to B. virosa JCM 15149 T and B. paravirosa JCM 18677 T . Growth occurs between 25 and 42 °C with an optimum at 37 °C. Bile and NaCl concentration range allowing growth are 0-3.75 % and 0-1.8 %, respectively. pH range for growth is 5.5-8. The strain produced propionate as the major end product from glucose. The major cellular fatty acids of strain H184 T were iso-C15 : 0 (63.5 %) and iso-C17 : 0 3-OH (12.8%). The major menaquinone of the strain was MK-10 (86 %). DNA G+C content of the isolate H184 T was 44.2 mol%. The genome-based comparison between strain H184 T and B. virosa JCM 15149 T by pairwise average nucleotide identity indicated a clear distinction with a score of 87.22. On the basis of these data, strain H184 T represents a novel species of the genus Butyricimonas, for which the name Butyricimonas faecalis sp. nov. is proposed. The type strain of B. faecalis is H184 T (DSM 106867 T , LMG 30602 T ).