We sequenced nearly complete small-subunit rRNAs of 54 reference strains belonging to the genera , and We then performed a phylogenetic analysis by comparing the sequences which we obtained with all other known sequences for bacteria belonging to the gamma subgroup of the (thus providing a data base consisting of 70 sequences for the genera investigated), using methods such as neighbor joining, maximum likelihood, and maximum parsimony, as well as bootstrap, to assess the robustness of each topology. Our results confirmed that the family should include only and species (but not ); that species deserve family rank; and that is linked to the family The genera , and , together with the family , the family , and probably the genus , form a robust monophyletic unit within the gamma 3 subgroup of the


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