SUMMARY: 16S rDNA analysis was performed on 32 strains of 26 species of the genera and in order to investigate the phylogenetic structure of these genera within the radiation of other mycolic-acid-containing genera such as and The genus shows a complex structure, consisting of six phylogenetically equidistant lineages. The genus does not appear to be a sister taxon of but branches off from within the radiation of ; thus its species can be considered to be derived from a ancestor. The main known phenotypic feature that separates species from those of appears to be the presence of a cyclic component in menaquinone of the MK-8(H) type.


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