Twelve strains named , at least 29 strains representing 16 species belonging to rRNA groups 1 and 2, one strain, and 38 strains of and , were characterized genotypically using amplified rDNA restriction analysis (ARDRA), and phenotypically using routine diagnostic characters comprising 61 biochemical tests in the API System and 15 observations of vegetative cell and sporangial morphology. The strains were also characterized by fatty acid methyl ester analysis and SDS-PAGE of whole-cell proteins. ARDRA revealed that strains of formed a cluster quite separate from other species in rRNA group 1, supporting the recognition of the former as a separate genus, for which the name is proposed. The polyphasic data also indicate the presence of an as yet undescribed new species within this genus. The species and related organisms comprising this new genus can be distinguished from members of rRNA group 1 (), and from members of and other aerobic endospore-forming bacteria by routine phenotypic tests.


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