Abstract
Total base sequences of the 16S rRNA genes ofThiobacillus halophilus andThiobacillus aquaesulis show that these bacteria fall into the gamma- and beta-subdivisions, respectively of the Proteobacteria. The closest relative ofT. halophilus isThiobacillus hydrothermalis (with 98.7% similarity), and the closest relative ofT. aquaesulis isThiobacillus thioparus (93.2% similarity). Physiological properties and mol% G+C content of their DNA serve to confirm that these four organisms are all distinct species. It is reiterated that the species currently assigned to the genusThiobacillus are clearly so diverse that they need reclassification into several genera. The type species,T. thioparus, is unequivocally placed in the beta-subdivision of the Proteobacteria, thus requiring that the use of the genus nameThiobacillus be restricted to the chemolithoautotrophic species falling into that group.T. aquaesulis andT. thioparus may thus be regarded as true species ofThiobacillus. The relatively large number of obligately chemolithoautotrophicThiobacillus species falling in the gamma-subdivision of the Proteobacteria need further study in order to assess the case for reclassification into one or more new or different genera.
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McDonald, I.R., Kelly, D.P., Murrell, J.C. et al. Taxonomic relationships ofThiobacillus halophilus, T. aquaesulis, and other species ofThiobacillus, as determined using 16S rDNA sequencing. Arch. Microbiol. 166, 394–398 (1996). https://doi.org/10.1007/BF01682985
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DOI: https://doi.org/10.1007/BF01682985