The phylogenetic position and various genotypic, chemotaxonomic, and classical phenotypic characteristics of 21 gram-negative avian isolates were studied. These strains constitute a genotypically homogeneous taxon in rRNA superfamily V, as shown by DNA-rRNA hybridization data. Determination of the 16S rRNA sequence of this taxon revealed its detailed position within the “flavobacter” subgroup of the “flavobacter-bacteroides” phylum as described by Gherna and Woese (R. Gherna and C. R. Woese, Syst. Appl. Microbiol. 15:513-521, 1992). This new taxon is only distantly related to other members of the “flavobacter-bacteroides” phylum and is therefore given separate generic status. The DNA-DNA binding values for members of this taxon, for which we propose the name , confirmed that all of the strains are highly interrelated (DNA-DNA binding values greater than 90% were measured). The G+C contents of members of this taxon are between 37 and 39 mol%. An analysis of the cellular proteins and fatty acids and classical phenotypic characteristics allowed us to distinguish from phenotypically similar taxa, such as and species. The respiratory quinone content (menaquinone 7) and carbohydrate pattern of conform with the respiratory quinone contents and carbohydrate patterns of other members of rRNA superfamily V.


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