Sequencing of the 16S ribosomal DNAs (rDNA) of two strains of was performed to determine the relationship of this species to other mycolic acid-containing actinomycetes. For this purpose we also determined the 16S rDNA sequences for the type species of the genus , and for (formerly ), , and , for which only partial sequence data have been available previously. The sequences of the two strains of were identical. The results of a distance matrix analysis indicated that is not a member of the genus but is located between members of the genus and members of the cluster. The finding that is phylogenetically isolated is supported by the presence of -acetyl residues in the glycan moiety of the peptidoglycan and the lack of phosphatidylinositol and phosphatidylinositol mannosides, characteristics which distinguish this taxon from related taxa. On the basis of our results and previous findings, we propose that should be reclassified in a new genus, . The type species is comb. nov.


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