Fifty-three strains representing 25 species of aerobic endospore-forming bacteria, of which 11 (37 strains) belong to the genera and ( rRNA group 4 of Ash et al. [Lett. Appl. Microbiol. 13:202–206, 1991]), were characterized genotypically by amplified ribosomal DNA restriction analysis (ARDRA) and/or phenotypically by fatty acid methyl ester analysis, sodium dodecylsulfate-polyacrylamide gel electrophoresis of whole-cell proteins, pyrolysis mass spectrometry, 99 API Biotype 100 assimilation tests, and 16 other routine phenotypic tests. ARDRA revealed that , and formed a cluster quite separate from species, supporting the distinction of both genera and the transfer of to the genus . Two of the species, (the type species) and , are phenotypically and genotypically quite similar but can be distinguished from each other by several phenotypic characters. Phenotypic differentiation at the generic level is also described.


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