The phylogenetic relationships of the type strains of 38 species from 15 genera of the family were investigated by comparative 16S rDNA analysis. Several sequences of strains from the genera and in this study, have been analysed previously. However, as the sequences of this study differ slightly from the published ones, they were included in the analysis. Of the 23 enterobacterial genera included in an overview dendrogram of relatedness, members of the genera and were used as a root. The other genera formed two groups which could be separated, although not exclusively, by signature nucleotides at positions 590–649 and 600–638. Group species of and . All seven type strains of share 16S rDNA similarities greater than 99%. Group B embraces two phylogenetically separate Serratia clusters, a lineage containing , and also the highly related pair and .


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