We determined the 16S rRNA sequences of the type strains of species belonging to the genera and for which no sequence data were available previously. We also determined the 16S rRNA sequence of ACAM 21, a representative strain of a biovar of . The members of the genera , and and the misnamed organism formed a monophyletic group within the gamma subclass of the . The 16S rRNA sequences of the members of this group contained all of the signature features previously identified as characteristic of the group. The frequency of occurrence of these signature features among other members of the gamma subclass has remained stable during the expansion of the database of rRNA sequences. The levels of 16S rRNA sequence similarity between members of the species belonging to the genera , and the misnamed organism ranged from 91.5 to 100%; however, the level of sequence similarity for members of well-resolved monophyletic subgroups which might represent separate genera was 98%. At a sequence similarity level of 98% 10 subgroups were resolved, but these groups could not be differentiated on the basis of chemotaxonomic or phenotypic characteristics. In this paper we propose that members of the genera , and should be placed in a single genus, the genus , and we emend the description of this genus. The resulting new combinations are Akagawa and Yamasato 1989), ( Fendrich 1988), ( Baumann et al. 1983), Baumann et al. 1983), Baumann et al. 1983), Baumann et al. 1983), Quesada et al. 1984), and Valderrama et al. 1991). We transfer the misnamed organism to the genus as comb. nov. ( Robinson and Gibbons 1952). The genus is closely related to the genus . While the genus can be clearly distinguished from the genus , these two taxa share important genotypic, chemotaxonomic, and phenotypic characteristics. We propose that the genus should be transferred to the family and emend the description of the family . The 16S rRNA sequence of ACAM 21 was significantly different from the 16S rRNA sequence of the type strain of (strain ACAM 12) but was nearly identical to the 16S rRNA sequence of .


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