Two anaerobic, non-spore-forming, pleomorphic, Gram-negative rods, designated YIT 11840 and YIT 11841, were isolated from human faeces. The organisms were catalase-negative, produced succinic and acetic acids as end products of glucose metabolism and had DNA G+C contents of approximately 48–49 mol%. Although the phenotypic characteristics of these two strains were very similar, analysis of their 16S rRNA gene sequences showed that they are only distantly related (93.8 %), indicating that they represent two different species. A comparative sequence analysis revealed that these two species are members of the family ‘’ but are phylogenetically distant (<88 % sequence similarity) from the known genera belonging to this family, including , and . On the basis of the phylogenetic analysis and physiological tests, strains YIT 11840 and YIT 11841 represent two novel species of a new genus, for which the names gen. nov., sp. nov. (type strain YIT 11840 =JCM 14859 =DSM 19731), the type species, and sp. nov. (type strain YIT 11841 =JCM 14860 =DSM 19681) are proposed.


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