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Here, the first description is reported of an epsilon sulfur-oxidizing bacterium from sulfide-rich sediments of marine mangrove in the Caribbean. By transition electron microscopy it was shown that this new strain contains intracytoplasmic large internal sulfur granules, which was confirmed by energy-dispersive X-ray spectroscopy analyses performed using an environmental scanning electron microscope. The sulfur distribution obtained for this sulfur-oxidizing bacterial strain allowed us to conclude that elemental sulfur is formed as an intermediate oxidation product and stored intracellularly. By conventional scanning electron microscopy it was shown that the bacterial cells are ovoid and extremely motile by lophotrichous flagella. Phylogenetic analyses based on partial sequence of the 16S rRNA gene confirmed that the bacterial strain belongs to the Thiovulum cluster and could be a representative of a new species in this poorly studied genus of sulfur-oxidizing free-living bacteria. Thus, reduced sediment of marine mangrove represents a sulfide-rich environment sustaining development of both gamma and epsilon sulfur-oxidizing Proteobacteria.

First description of a new uncultured epsilon sulfur bacterium colonizing marine mangrove sediment in the Caribbean: Thiovulum sp. strain karukerense