A coccoid, phototrophic purple sulfur bacterium was isolated in pure culture from a mud sample collected from brackish water in the Bhitarkanika mangrove forest of Orissa, India, in a medium containing 2 % NaCl (w/v). This bacterium, strain JA304, was Gram-negative and had a requirement for NaCl. Intracellular photosynthetic membranes were of the vesicular type. The colour of the phototrophically grown culture was saddle-brown. Bacteriochlorophyll and the carotenoid lycopene were present as photosynthetic pigments. Strain JA304 was able to grow photolithoautotrophically and could photoassimilate a number of organic substrates. Yeast extract was required for growth of strain JA304. The DNA G+C content was 68.1–68.9 mol%. 16S rRNA gene sequence comparisons indicate that the isolate represents a member of the within the class . According to sequence comparison data, strain JA304 is positioned distinctly outside the group formed by the four genera , , and , with only 86.7–91.0 % sequence similarity. Distinct morphological, physiological and genotypic differences from these previously described taxa support the classification of this isolate as a representative of a novel species in a new genus, for which the name gen. nov., sp. nov. is proposed. The type strain of is JA304 (=JCM 14889 =DSM 19863).


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Phase-contrast micrograph of cells of strain JA304 . Bar, 5 µm.


Whole-cell absorption spectrum of strain JA304 (a) and acetone spectrum of extracted pigments (b).


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