Nearly complete sequences of 16S rRNA genes of representative strains of the genus were determined following the isolation and cloning of the amplified genes. The sequences were aligned with those of representatives of the family , and a phylogenetic tree was inferred by the neighbor-joining method. The genus formed a distinct clade within the evolutionary radiation encompassed by the family . The average nucleotide similarity value found between the type strains of the four validly described species was 97.5% ± 1.0%. The most distant relationship was found between and K73 (96.3% similarity). In contrast, K161 and “” K163 had identical 16S rRNA gene sequences. The nucleotide sequence data suggest that the genus contains several new centers of variation.


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