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The Spirochateta are Gram-negative free-living spiral bacteria that feature the same kind of axial filaments found in Treponema and Borrelia. Unlike its relatives, though, Spirochaeta are non-pathogenic. Spirochaetes can be found in fresh water habitats and extremely hot sulfurous environments.
Domain Bacteria
Phylum Spirochaetes
Class Spirochaetes
Bergey's Manual Volume 5: The Planctomycetes, Spriochaetes, Fibrobacteres, Bacteriodetes and Fusobacteria