Several strains of a novel heterotrophic gas vacuolate bacterium were isolated from antarctic marine waters. The results of phylogenetic analyses in which 16S ribosomal DNA sequencing was used, coupled with pheno-typic tests, indicated that strain 34-P (T = type strain) belongs to a new genus and species of the beta subgroup of the , for which the name is proposed. Although the other four strains studied probably belong to this new species, DNA-DNA hybridization tests were not conducted. The closest phylogenetic relatives of are the photosynthetic nonsulfur purple bacterium and the hydrogen autotroph .


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