The taxonomic position of the genus comprising a single species, , was reviewed. This genus was originally characterized by formation of long, curly and sometimes branching sporangia containing numerous zoospores arranged in a single row and by the presence of -diaminopimelic acid and madurose (3-O-methyl-D-galactose) in wholecell hydrolysates. However, our chemotaxonomic analyses of the type strain of did not agree with the original description. The peptidoglycan contained L-lysine but not -diaminopimelic acid, and the whole-cell hydrolysate contained xylose as the characteristic sugar but not madurose. These characteristics and other chemotaxonomic profiles (e.g. menaquinone, phospholipid and cellular fatty acid compositions) of the genus with those of the genus . These two genera also had very similar morphological characteristics, but in the original description of the genus the presence of sporangia was not referred to. This difference is considered to originate from a divergence of views owing to the ambiguity of the definition of the term ‘sporangium’ in actinomycete morphology. Phylogenetic analysis based on 16S rDNA sequences also supported the proposal that the genera and should be combined into one genus. Levels of DNA relatedness among the type strains of and six species and their cultural, physiological and biochemical characteristics indicated that should be classified as an independent species of the genus , which has priority over the genus . Therefore, it is proposed that be transferred to the genus C as comb. nov.


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