The transfer of Thiobacillus delicatus to the genus Thiomonas as a distinct species, Thiomonas delicata (type strain NBRC 14566T), is confirmed by its morphological and physiological properties, DNA-DNA hybridization and the grouping of its 16S rRNA gene sequence with those of other species of the genus. An emended formal description of Thiomonas delicata is given. The status of Thiomonas cuprina DSM 5495T as a member of the genus is reconsidered.
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