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Bacteroides plebeius sp. nov. and Bacteroides coprocola sp. nov., isolated from human faeces

Microbe Division/Japan Collection of Microorganisms, RIKEN BioResource Center, Wako, Saitama 351-0198, Japan

Correspondence
Maki Kitahara
kitahara{at}jcm.riken.jp

Nine strains of Gram-negative, anaerobic rod were isolated from human faeces. Based on phylogenetic analysis and specific phenotypic characteristics, these strains were included within the Bacteroides cluster and were divided into two clusters. Strains from the two clusters showed 16S rRNA gene sequence similarities of 90·4 and 92·7 % to the nearest recognized species, Bacteroides vulgatus. The strains also formed two clusters exhibiting a 16S rRNA gene sequence divergence of approximately 6 %. DNA–DNA hybridization studies confirmed that the two novel strain clusters were distinct from each other. Based on the phenotypic and phylogenetic findings, two novel species, Bacteroides plebeius sp. nov. and Bacteroides coprocola sp. nov., are proposed, each representing one of the two strain clusters. The DNA G+C content of the type strains were 43·9 mol% for B. plebeius (M12^T=JCM 12973^T=DSM 17135^T) and 42·4 mol% for B. coprocola (M16^T=JCM 12979^T=DSM 17136^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of Bacteroides plebeius M12^T and Bacteroides coprocola M16^T are AB200217 and AB200224, respectively.

Tables detailing results using the API 20A and Rapid ID 32A systems, cellular fatty acid contents, and DNA base composition and levels of DNA–DNA relatedness among the new and related strains are available as supplementary material in IJSEM Online.

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